FCC Commercial Element 8 Question Pool 2009

Card Set Information

Author:
Anonymous
ID:
262532
Filename:
FCC Commercial Element 8 Question Pool 2009
Updated:
2014-02-18 00:02:36
Tags:
FCC Commercial Element Radar Endorsement
Folders:

Description:
FCC Commercial Element 8 Question Pool 2009
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Anonymous on FreezingBlue Flashcards. What would you like to do?


  1. 8-1A1 Choose the most correct statement containing the parameters which control the size of the target echo.
    A. Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.
    B. Power radiated, antenna gain, size of target, shape of target, pulse width, receiver gain.
    C. Magnetron gain, antenna gain, size of target, range to target, wave-guide loss.
    D. Height of antenna, power radiated, size of target, receiver gain, pulse width.
    A. Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.
    (this multiple choice question has been scrambled)
  2. 8-1A2 Which of the following has NO effect on the maximum range capability?
    A. Carrier frequency.
    B. Recovery time.
    C. Pulse repetition frequency.
    D. Receiver sensitivity.
    B. Recovery time.
    (this multiple choice question has been scrambled)
  3. 8-1A3 What type of transmitter power is measured over a period of time?
    A. Return.
    B. Reciprocal.
    C. Average.
    D. Peak.
    C. Average.
    (this multiple choice question has been scrambled)
  4. 8-1A4 What RADAR component controls timing throughout the system?
    A. Power supply.
    B. Indicator.
    C. Synchronizer.
    D. Receiver.
    C. Synchronizer.
    (this multiple choice question has been scrambled)
  5. 8-1A5 Which of the following components allows the use of a single antenna for both transmitting and receiving?
    A. Synchronizer.
    B. Mixer.
    C. Duplexer.
    D. Modulator.
    C. Duplexer.
    (this multiple choice question has been scrambled)
  6. 8-1A6 The sweep frequency of a RADAR indicator is determined by what parameter?
    A. Pulse width.
    B. Pulse repetition frequency.
    C. Carrier frequency.
    D. Duty cycle.
    B. Pulse repetition frequency.
    (this multiple choice question has been scrambled)
  7. 8-2A1 A radio wave will travel a distance of three nautical miles in:
    A. 22.76 microseconds.
    B. 6.17 microseconds.
    C. 37.0 microseconds.
    D. 18.51 microseconds.
    D. 18.51 microseconds.
    (this multiple choice question has been scrambled)
  8. 8-2A2 One RADAR mile is how many microseconds?
    A. 0.186
    B. 12.34
    C. 6.2
    D. 528.0
    C. 6.2
    (this multiple choice question has been scrambled)
  9. 8-2A3 RADAR range is measured by the constant:
    A. 150 yards per microsecond.
    B. 150 meters per microsecond.
    C. 18.6 miles per microsecond.
    D. 300 yards per microsecond.
    B. 150 meters per microsecond.
    (this multiple choice question has been scrambled)
  10. 8-2A4 If a target is 5 miles away, how long does it take for the RADAR echo to be received back at the antenna?
    A. 51.4 microseconds.
    B. 30.75 microseconds.
    C. 123 microseconds.
    D. 61.7 microseconds.
    D. 61.7 microseconds.
    (this multiple choice question has been scrambled)
  11. 8-2A5 How long would it take for a RADAR pulse to travel to a target 10 nautical miles away and return to the RADAR receiver?
    A. 10 microseconds.
    B. 1.234 microseconds.
    C. 12.34 microseconds.
    D. 123.4 microseconds.
    D. 123.4 microseconds.
    (this multiple choice question has been scrambled)
  12. 8-2A6 What is the distance in nautical miles to a target if it takes 308.5 microseconds for the RADAR pulse to travel from the RADAR antenna to the target and back.
    A. 25 nautical miles.
    B. 12.5 nautical miles.
    C. 50 nautical miles.
    D. 2.5 nautical miles.
    A. 25 nautical miles.
    (this multiple choice question has been scrambled)
  13. 8-3A1 Frequencies generally used for marine RADAR are in the ___ part of the radio spectrum.
    A. UHF
    B. SHF
    C. EHF
    D. VHF
    B. SHF
    (this multiple choice question has been scrambled)
  14. 8-3A2 Practical RADAR operation requires the use of microwave frequencies so that:
    A. Non-directional antennas can be used for both transmitting and receiving.
    B. Interference to other communication systems will be eliminated.
    C. Stronger target echoes will be produced.
    D. Ground clutter interference will be minimized.
    C. Stronger target echoes will be produced.
    (this multiple choice question has been scrambled)
  15. 8-3A3 An S-band RADAR operates in which frequency band?
    A. 2 - 4 GHz.
    B. 4 - 8 GHz.
    C. 8 - 12 GHz.
    D. 1 - 2 GHz.
    A. 2 - 4 GHz.
    (this multiple choice question has been scrambled)
  16. 8-3A4 A RADAR operating at a frequency of 3 GHz has a wavelength of approximately:
    A. 30 centimeters.
    B. 10 centimeters.
    C. 3 centimeters.
    D. 1 centimeter.
    B. 10 centimeters.
    (this multiple choice question has been scrambled)
  17. 8-3A5 The major advantage of an S-band RADAR over an X-band RADAR is:
    A. It is mechanically less complex.
    B. It has greater power output.
    C. It is less affected by weather conditions.
    D. It has greater bearing resolution.
    C. It is less affected by weather conditions.
    (this multiple choice question has been scrambled)
  18. 8-3A6 An X band RADAR operates in which frequency band?
    A. 4 - 8 GHz.
    B. 8 - 12 GHz.
    C. 2 - 4 GHz.
    D. 1 - 2 GHz.
    B. 8 - 12 GHz.
    (this multiple choice question has been scrambled)
  19. 8-4A1 A pulse RADAR has a pulse repetition frequency (PRF) of 400 Hz, a pulse width of 1 microsecond, and a peak power of 100 kilowatts. The average power of the RADAR transmitter is:
    A. 40 watts.
    B. 400 watts.
    C. 25 watts.
    D. 250 watts.
    A. 40 watts.
    (this multiple choice question has been scrambled)
  20. 8-4A2 A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minimum range of 75 meters. Its duty cycle is:
    A. 0.005
    B. 0.5
    C. 0.0005
    D. 0.05
    C. 0.0005
    (this multiple choice question has been scrambled)
  21. 8-4A3 A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:
    A. A maximum range of 480 kilometers.
    B. A PRF of 3,200.
    C. A duty cycle of 3.125 percent.
    D. An average power of 31.25 watts.
    D. An average power of 31.25 watts.
    (this multiple choice question has been scrambled)
  22. 8-4A4 If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of 0.5 microseconds and a peak power of 15 kilowatts, what is its average power output?
    A. 15 kilowatts.
    B. 166.67 watts.
    C. 6.75 watts.
    D. 13.5 watts.
    C. 6.75 watts.
    (this multiple choice question has been scrambled)
  23. 8-4A5 What is the average power if the RADAR set has a PRF of 1000 Hz, a pulse width of 1 microsecond, and a peak power rating of 100 kilowatts?
    A. None of these.
    B. 1,000 watts.
    C. 10 watts.
    D. 100 watts.
    D. 100 watts.
    (this multiple choice question has been scrambled)
  24. 8-4A6 A search RADAR has a pulse width of 1.0 microsecond, a pulse repetition frequency (PRF) of 900 Hz, and an average power of 18 watts. The unit’s peak power is:
    A. 20 kilowatts.
    B. 180 kilowatts.
    C. 200 kilowatts.
    D. 2 kilowatts.
    A. 20 kilowatts.
    (this multiple choice question has been scrambled)
  25. 8-5A1 For a range of 5 nautical miles, the RADAR pulse repetition frequency should be:
    A. 16.2 MHz or less.
    B. 16.2 kHz or less.
    C. 16.2 Hz or more.
    D. 1.62 kHz or more.
    B. 16.2 kHz or less.
    (this multiple choice question has been scrambled)
  26. 8-5A2 For a range of 100 nautical miles, the RADAR pulse repetition frequency should be:
    A. 81 kHz or more.
    B. 810 Hz or less.
    C. 8.1 kHz or more.
    D. 8.1 kHz or less.
    B. 810 Hz or less.
    (this multiple choice question has been scrambled)
  27. 8-5A3 The minimum range of a RADAR is determined by:
    A. The frequency of the RADAR transmitter.
    B. The pulse repetition rate.
    C. The transmitted pulse width.
    D. The pulse repetition frequency.
    C. The transmitted pulse width.
    (this multiple choice question has been scrambled)
  28. 8-5A4 Short range RADARs would most likely transmit:
    A. Narrow pulses at a slow rate.
    B. Wide pulses at a slow rate.
    C. Narrow pulses at a fast rate.
    D. Wide pulses at a fast rate.
    C. Narrow pulses at a fast rate.
    (this multiple choice question has been scrambled)
  29. 8-5A5 For a range of 30 nautical miles, the RADAR pulse repetition frequency should be:
    A. 2.7 kHz or less.
    B. 27 kHz or more.
    C. 0.27 kHz or less.
    D. 2.7 Hz or more.
    A. 2.7 kHz or less.
    (this multiple choice question has been scrambled)
  30. 8-5A6 For a range of 10 nautical miles, the RADAR pulse repetition frequency (PRF) should be:
    A. Approximately 8.1 kHz or less.
    B. 900 Hz.
    C. 18.1 kHz or more.
    D. 120.3 microseconds.
    A. Approximately 8.1 kHz or less.
    (this multiple choice question has been scrambled)
  31. 8-6A1 If the PRF is 2500 Hz, what is the PRI?
    A. 400 microseconds.
    B. 250 microseconds.
    C. 800 microseconds.
    D. 40 microseconds.
    A. 400 microseconds.
    (this multiple choice question has been scrambled)
  32. 8-6A2 If the pulse repetition frequency (PRF) is 2000 Hz, what is the pulse repetition interval (PRI)?
    A. 0.0005 seconds.
    B. 0.00005 seconds.
    C. 0.005 seconds.
    D. 0.05 seconds.
    A. 0.0005 seconds.
    (this multiple choice question has been scrambled)
  33. 8-6A3 The pulse repetition rate (PRR) refers to:
    A. The pulse rate of the local oscillator tube.
    B. The pulse rate of the magnetron.
    C. The reciprocal of the duty cycle.
    D. The pulse rate of the klystron.
    B. The pulse rate of the magnetron.
    (this multiple choice question has been scrambled)
  34. 8-6A4 If the RADAR unit has a pulse repetition frequency (PRF) of 2000 Hz and a pulse width of 0.05 microseconds, what is the duty cycle?
    A. 0.001
    B. 0.0005
    C. 0.0001
    D. 0.05
    C. 0.0001
    (this multiple choice question has been scrambled)
  35. 8-6A5 Small targets are best detected by:
    A. Using a long pulse width with high output power.
    B. Short pulses transmitted at a fast rate.
    C. Using J band frequencies.
    D. All of these answers are correct.
    A. Using a long pulse width with high output power.
    (this multiple choice question has been scrambled)
  36. 8-6A6 What is the relationship between pulse repetition rate and pulse width?
    A. Higher PRR with wider pulse width.
    B. The pulse repetition rate does not change with the pulse width.
    C. Lower PRR with wider pulse width.
    D. The pulse width does not change with the pulse repetition rate.
    C. Lower PRR with wider pulse width.
    (this multiple choice question has been scrambled)

  37. 8-7A1 What component of a RADAR receiver is represented by block 46 in Fig. 8A1?
    A. The RF Attenuator.
    B. The TR box.
    C. The Crystal Detector.
    D. The ATR box.
    B. The TR box.
    (this multiple choice question has been scrambled)
  38. 8-7A2 A basic sample-and-hold circuit contains:
    A. An analog multiplexer and a capacitor.
    B. An analog switch, a capacitor, amplifiers and input and output buffers.
    C. An analog switch, a capacitor, and an amplifier.
    D. An analog switch and an amplifier.
    B. An analog switch, a capacitor, amplifiers and input and output buffers.
    (this multiple choice question has been scrambled)
  39. 8-7A3 When comparing a TTL and a CMOS NAND gate:
    A. Both have comparable input power sourcing.
    B. Both have active pull-up characteristics.
    C. Both employ Schmitt diodes for increased speed capabilities.
    D. Both have three output states.
    B. Both have active pull-up characteristics.
    (this multiple choice question has been scrambled)
  40. 8-7A4 Silicon crystals:
    A. Are very sensitive to static electric charges.
    B. Tolerate very low currents.
    C. Should be wrapped in lead foil for storage.
    D. All of these.
    D. All of these.
    (this multiple choice question has been scrambled)
  41. 8-7A5 Which is typical current for a silicon crystal used in a RADAR mixer or detector circuit?
    A. 15 mA
    B. 50 mA
    C. 3 mA
    D. 100 mA
    C. 3 mA
    (this multiple choice question has been scrambled)

  42. 8-7A6 What component of a RADAR receiver is represented by block 47 in Fig. 8A1?
    A. The RF Attenuator.
    B. The TR box.
    C. The ATR box.
    D. The Crystal Detector.
    A. The RF Attenuator.
    (this multiple choice question has been scrambled)
  43. 8-8A1 The basic frequency determining element in a Gunn oscillator is:
    A. The power supply voltage.
    B. The loading of the oscillator by the mixer.
    C. The resonant cavity.
    D. The type of semiconductor used.
    C. The resonant cavity.
    (this multiple choice question has been scrambled)
  44. 8-8A2 Which of the following is not a method of analog-to-digital conversion?
    A. Switched-capacitor conversion.
    B. Dynamic-range conversion.
    C. Dual-slope integration.
    D. Delta-sigma conversion.
    B. Dynamic-range conversion.
    (this multiple choice question has been scrambled)
  45. 8-8A3 When comparing TTL and CMOS logic families, which of the following is true:
    A. When a CMOS input is held low, it sources current into whatever it drives.
    B. Unused inputs should be tied high or low as necessary especially in the CMOS family.
    C. CMOS logic requires a supply voltage of 5 volts 20%, whereas TTL logic requires 5 volts 5%.
    D. At higher operating frequencies, CMOS circuits consume almost as much power as TTL circuits.
    D. At higher operating frequencies, CMOS circuits consume almost as much power as TTL circuits.
    (this multiple choice question has been scrambled)
  46. 8-8A4 The primary operating frequency of a reflex klystron is controlled by the:
    A. Dimensions of the resonant cavity.
    B. Voltage applied to the cavity grids.
    C. Level of voltage on the control grid.
    D. Voltage applied to the repeller plate.
    A. Dimensions of the resonant cavity.
    (this multiple choice question has been scrambled)
  47. 8-8A5 A Gunn diode oscillator takes advantage of what effect?
    A. Negative resistance and bulk-effect.
    B. Avalanche transit time.
    C. Bulk-effect.
    D. Negative resistance.
    A. Negative resistance and bulk-effect.
    (this multiple choice question has been scrambled)
  48. 8-8A6 Fine adjustments of a reflex klystron are accomplished by:
    A. Adjusting the flexible wall of the cavity.
    B. Varying the cavity grid potential.
    C. Adjusting the AFC control system.
    D. Varying the repeller voltage.
    D. Varying the repeller voltage.
    (this multiple choice question has been scrambled)
  49. 8-9A1 Blocking oscillators operate on the formula of:
    A. T = R x C.
    B. I = E/R.
    C. By using the receiver’s AGC.
    D. None of the above are correct.
    A. T = R x C.
    (this multiple choice question has been scrambled)
  50. 8-9A2 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
    A. The Memory and I/O communicate with peripherals.
    B. The control unit executes arithmetic manipulations.
    C. The internal bus is used simultaneously by all units.
    D. The ALU is used for address decoding.
    A. The Memory and I/O communicate with peripherals.
    (this multiple choice question has been scrambled)
  51. 8-9A3 The phantastron circuit is capable of:
    A. Stabilizing the magnetron.
    B. Being used to control repeller voltage in the AFC system.
    C. Developing a linear ramp voltage when triggered by an external source.
    D. Preventing saturation of the RADAR receiver.
    C. Developing a linear ramp voltage when triggered by an external source.
    (this multiple choice question has been scrambled)

  52. 8-9A4 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
    A. The ALU is used for address decoding.
    B. The ALU executes arithmetic manipulations.
    C. Address pointers are contained in the control unit.
    D. General registers are used for arithmetic manipulations.
    B. The ALU executes arithmetic manipulations.
    (this multiple choice question has been scrambled)

  53. 8-9A5 In the Line-Driver/Coax/Line-receiver circuit shown in Fig. 8A3, what component is represented by the blank box marked "X"?
    A. 25-ohm resistor.
    B. 51-ohm resistor.
    C. 10-microhm inductor.
    D. 20-microhm inductor.
    B. 51-ohm resistor.
    (this multiple choice question has been scrambled)
  54. 8-9A6 Choose the most correct statement:
    A. The magnetron anode is a low voltage circuit.
    B. The anode of the magnetron carries high voltage.
    C. The filament of the magnetron carries dangerous voltages.
    D. The magnetron filament is a low voltage circuit.
    C. The filament of the magnetron carries dangerous voltages.
    (this multiple choice question has been scrambled)

  55. 8-10A1 In the circuit shown in Fig. 8A4, U5 pins 1 and 4 are high and both are in the reset state. Assume one clock cycle occurs of Clk A followed by one cycle of Clk B. What are the output states of the two D-type flip flops?
    A. Pin 5 high, Pin 9 low.
    B. Pin 5 high, Pin 9 high.
    C. Pin 5 low, Pin 9 high.
    D. Pin 5 low, Pin 9 low.
    B. Pin 5 high, Pin 9 high.
    (this multiple choice question has been scrambled)

  56. 8-10A2 If more light strikes the photodiode in Fig. 8A5, there will be:
    A. Less diode current.
    B. There is wrong polarity on the diode.
    C. More diode current.
    D. No change in diode current.
    C. More diode current.
    (this multiple choice question has been scrambled)
  57. 8-10A3 In the circuit shown in Fig. 8A6, which of the following is true?
    A. With either A or B low, Q1 is saturated and Q2 is off.
    B. With either A or B low, Q1 is off and Q2 is on.
    C. With A and B low, Q2 is on and Q4 is off.
    D. With A and B high, Q1 is saturated and Q2 is off.
    A. With either A or B low, Q1 is saturated and Q2 is off.
    (this multiple choice question has been scrambled)

  58. 8-10A4 What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?
    A. 77 ohms.
    B. 4,700 ohms.
    C. 155 ohms.
    D. 10,000 ohms.
    A. 77 ohms.
    (this multiple choice question has been scrambled)

  59. 8-10A5 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
    A. General registers are used for arithmetic manipulations.
    B. The control unit executes arithmetic manipulations.
    C. The ALU is used for address decoding.
    D. Address pointers are contained in the general registers.
    D. Address pointers are contained in the general registers.
    (this multiple choice question has been scrambled)

  60. 8-10A6 You are troubleshooting a component on a printed circuit board in a RADAR system while referencing the Truth Table in Fig. 8A8. What kind of integrated circuit is the component?
    A. D-type Flip-Flop, 3-State, Inverting.
    B. Q-type Directional Shift Register, Dual.
    C. Q-type Flip-Flop, Non-Inverting.
    D. D to Q Convertor, 2-State.
    A. D-type Flip-Flop, 3-State, Inverting.
    (this multiple choice question has been scrambled)
  61. 8-11B1 The magnetron is used to:
    A. Modulate the pulse signal.
    B. Generate the output signal at the proper operating frequency.
    C. Determine the shape and width of the transmitted pulses.
    D. Determine the pulse repetition rate.
    B. Generate the output signal at the proper operating frequency.
    (this multiple choice question has been scrambled)
  62. 8-11B2 The purpose of the modulator is to:
    A. Transmit the high voltage pulses to the antenna.
    B. Adjust the pulse repetition rate.
    C. Provide high voltage pulses of the proper shape and width to the magnetron.
    D. Tune the Magnetron to the proper frequency.
    C. Provide high voltage pulses of the proper shape and width to the magnetron.
    (this multiple choice question has been scrambled)
  63. 8-11B3 Which of the following statements about most modern RADAR transmitter power supplies is false?
    A. Low voltage supplies use switching circuits to deliver multiple voltages.
    B. Low voltage supplies may supply both AC and DC voltages.
    C. High voltage supplies may produce voltages in excess of 5,000 volts AC.
    D. There are usually separate low voltage and high voltage supplies.
    C. High voltage supplies may produce voltages in excess of 5,000 volts AC.
    (this multiple choice question has been scrambled)
  64. 8-11B4 The purpose of the Pulse Forming Network is to:
    A. Produce a pulse of the correct width.
    B. Act as a low pass filter.
    C. Regulate the pulse repetition rate.
    D. Act as a high pass filter.
    A. Produce a pulse of the correct width.
    (this multiple choice question has been scrambled)
  65. 8-11B5 The purpose of the Synchronizer is to:
    A. Insure that the TR tube conducts at the proper time.
    B. Control the pulse width.
    C. Generate the modulating pulse to the magnetron.
    D. Generate a timing signal that establishes the pulse repetition rate.
    D. Generate a timing signal that establishes the pulse repetition rate.
    (this multiple choice question has been scrambled)
  66. 8-11B6 Which of the following is not part of the transmitting system?
    A. Modulator.
    B. Magnetron.
    C. Pulse Forming Network.
    D. Klystron.
    D. Klystron.
    (this multiple choice question has been scrambled)
  67. 8-12B1 High voltage is applied to what element of the magnetron?
    A. The plate cap.
    B. The cathode.
    C. The waveguide.
    D. The anode.
    B. The cathode.
    (this multiple choice question has been scrambled)
  68. 8-12B2 The characteristic of the magnetron output pulse that relates to accurate range measurement is its:
    A. Rise time.
    B. Amplitude.
    C. Decay time.
    D. Duration.
    A. Rise time.
    (this multiple choice question has been scrambled)
  69. 8-12B3 What device is used as a transmitter in a marine RADAR system?
    A. Magnetron.
    B. Klystron.
    C. Thyratron.
    D. Beam-powered pentode.
    A. Magnetron.
    (this multiple choice question has been scrambled)
  70. 8-12B4 The magnetron is:
    A. Used as the local oscillator in the RADAR unit.
    B. A type of diode that requires an external magnetic field.
    C. A triode that requires an external magnetic field.
    D. A type of diode that requires an internal magnetic field.
    B. A type of diode that requires an external magnetic field.
    (this multiple choice question has been scrambled)
  71. 8-12B5 A negative voltage is commonly applied to the magnetron cathode rather than a positive voltage to the magnetron anode because:
    A. A positive voltage would tend to nullify or weaken the magnetic field.
    B. The anode can be operated at ground potential for safety reasons.
    C. The cavities might not be shock-excited into oscillation by a positive voltage.
    D. The cathode must be made neutral to force electrons into the drift area.
    B. The anode can be operated at ground potential for safety reasons.
    (this multiple choice question has been scrambled)
  72. 8-12B6 The anode of a magnetron is normally maintained at ground potential:
    A. Never. It must be highly positive to attract the electrons.
    B. Because greater peak-power ratings can be achieved.
    C. Because it operates more efficiently that way.
    D. For safety purposes.
    D. For safety purposes.
    (this multiple choice question has been scrambled)
  73. 8-13B1 In a solid-state RADAR modulator, the duration of the transmitted pulse is determined by:
    A. The magnetron voltage.
    B. The thyratron.
    C. The pulse forming network.
    D. The trigger pulse.
    C. The pulse forming network.
    (this multiple choice question has been scrambled)
  74. 8-13B2 The modulation frequency of most RADAR systems is between:
    A. 3000 and 6000 Hz.
    B. 60 and 500 Hz.
    C. 1000 and 3000 Hz.
    D. 1500 and 7500 Hz.
    B. 60 and 500 Hz.
    (this multiple choice question has been scrambled)
  75. 8-13B3 A shipboard RADAR uses a PFN driving a magnetron cathode through a step-up transformer. This results in which type of modulation?
    A. Frequency modulation.
    B. Continuous Wave (CW) modulation.
    C. Pulse modulation.
    D. Amplitude modulation.
    C. Pulse modulation.
    (this multiple choice question has been scrambled)
  76. 8-13B4 In a pulse modulated magnetron what device determines the shape and width of the pulse?
    A. Dimensions of the magnetron cavity.
    B. LC parallel circuit.
    C. Pulse Forming Network.
    D. Thyratron.
    C. Pulse Forming Network.
    (this multiple choice question has been scrambled)
  77. 8-13B5 What device(s) may act as the modulator of a RADAR system?
    A. Magnetron.
    B. Klystron.
    C. Thyratron or a silicon-controlled rectifier (SCR).
    D. Video amplifier.
    C. Thyratron or a silicon-controlled rectifier (SCR).
    (this multiple choice question has been scrambled)
  78. 8-13B6 The purpose of a modulator in the transmitter section of a RADAR is to:
    A. Improve bearing resolution.
    B. Provide the correct waveform to the transmitter.
    C. Control magnetron power output.
    D. Prevent sea return.
    B. Provide the correct waveform to the transmitter.
    (this multiple choice question has been scrambled)
  79. 8-14B1 The pulse developed by the modulator may have an amplitude greater than the supply voltage. This is possible by:
    A. Discharging a capacitor through an inductor.
    B. Using a voltage multiplier circuit.
    C. Employing a resonant charging choke.
    D. Discharging two capacitors in series and combining their charges.
    C. Employing a resonant charging choke.
    (this multiple choice question has been scrambled)
  80. 8-14B2 Pulse transformers and pulse-forming networks are commonly used to shape the microwave energy burst RADAR transmitter. The switching devices most often used in such pulse-forming circuits are:
    A. SCR’s and Thyratrons.
    B. Thyratrons and BJT’s.
    C. Switching transistors.
    D. Power MOSFETS and Triacs.
    A. SCR’s and Thyratrons.
    (this multiple choice question has been scrambled)
  81. 8-14B3 The purpose of the pulse-forming network is to:
    A. Act as a log pass filter.
    B. Determine the pulse repetition rate.
    C. Act as a high pass filter.
    D. Determine the width of the modulating pulses.
    D. Determine the width of the modulating pulses.
    (this multiple choice question has been scrambled)
  82. 8-14B4 The shape and duration of the high-voltage pulse delivered to the magnetron is established by:
    A. The time required to saturate the pulse transformer.
    B. The duration of the modulator input trigger.
    C. An RC network in the keyer stage.
    D. An artificial delay line.
    D. An artificial delay line.
    (this multiple choice question has been scrambled)
  83. 8-14B5 Pulse-forming networks are usually composed of the following:
    A. Resonant circuit with an inductor and capacitor.
    B. Series capacitors and shunt inductors.
    C. Series inductors and shunt capacitors.
    D, None of the above.
    C. Series inductors and shunt capacitors.
    (this multiple choice question has been scrambled)
  84. 8-14B6 An artificial transmission line is used for:
    A. Testing the RADAR unit, when actual targets are not available.
    B. The transmission of RADAR pulses.
    C. Testing the delay time for artificial targets.
    D. Determining the shape and duration of pulses.
    D. Determining the shape and duration of pulses.
    (this multiple choice question has been scrambled)
  85. 8-15B1 The ferrite material in a circulator is used as a(an):
    A. Electric switch.
    B. Loading element.
    C. Phase shifter.
    D. Saturated reactor.
    C. Phase shifter.
    (this multiple choice question has been scrambled)
  86. 8-15B2 In a circular resonant cavity with flat ends, the E-field and the H-field form with specific relationships. The:
    A. H-lines are perpendicular to the side walls.
    B. E-lines are parallel to the top and bottom walls.
    C. H-lines are circular to the end walls.
    D. E-lines are perpendicular to the end walls.
    D. E-lines are perpendicular to the end walls.
    (this multiple choice question has been scrambled)
  87. 8-15B3 A ferrite circulator is most commonly used in what portion of a RADAR system?
    A. The modulator.
    B. The receiver.
    C. The duplexer.
    D. The antenna.
    C. The duplexer.
    (this multiple choice question has been scrambled)
  88. 8-15B4 A circulator provides what function in the RF section of a RADAR system?
    A. It transmits antenna position to the indicator during operation.
    B. It permits tests to be made to the thyristors while in use.
    C. It replaces the TR cell and functions as a duplexer.
    D. It cools the magnetron by forcing a flow of circulating air.
    C. It replaces the TR cell and functions as a duplexer.
    (this multiple choice question has been scrambled)
  89. 8-15B5 A directional coupler has an attenuation of -30 db. A measurement of 100 milliwatts at the coupler indicates the power of the line is:
    A. 10,000 watts.
    B. 10 watts.
    C. 100 watts.
    D. 1,000 watts.
    C. 100 watts.
    (this multiple choice question has been scrambled)
  90. 8-15B6 What is the purpose or function of the RADAR duplexer/circulator?
    A. A dual section coupling device that allows the use of a magnetron as a transmitter.
    B. An electronic switch that allows the use of one antenna for both transmission and reception.
    C. A modified length of waveguide used to sample a portion of the transmitted energy for testing purposes.
    D. A coupling device that is used in the transition from a rectangular waveguide to a circular waveguide.
    B. An electronic switch that allows the use of one antenna for both transmission and reception.
    (this multiple choice question has been scrambled)
  91. 8-16B1 The ATR box:
    A. Prevents the received signal from entering the transmitter.
    B. Protects the receiver from strong RADAR signals.
    C. Turns off the receiver when the transmitter is on.
    D. All of the above.
    A. Prevents the received signal from entering the transmitter.
    (this multiple choice question has been scrambled)
  92. 8-16B2 When a pulse RADAR is radiating, which elements in the TR box are energized?
    A. The ATR tube only.
    B. Both the TR and ATR tubes.
    C. Neither the TR nor ATR tubes.
    D. The TR tube only.
    B. Both the TR and ATR tubes.
    (this multiple choice question has been scrambled)
  93. 8-16B3 The TR box:
    A. Protects the receiver from the strong RADAR pulses and mutes the receiver when the transmitter is on.
    B. Protects the receiver from the strong RADAR pulses.
    C. Prevents the received signal from entering the transmitter.
    D. Turns off the receiver when the transmitter is on.
    A. Protects the receiver from the strong RADAR pulses and mutes the receiver when the transmitter is on.
    (this multiple choice question has been scrambled)
  94. 8-16B4 What device is located between the magnetron and the mixer and prevents received signals from entering the magnetron?
    A. A resonant cavity.
    B. The ATR tube.
    C. The RF Attenuator.
    D. The TR tube.
    B. The ATR tube.
    (this multiple choice question has been scrambled)
  95. 8-16B5 A keep-alive voltage is applied to:
    A. The magnetron.
    B. The ATR tube.
    C. The crystal detector.
    D. The TR tube.
    D. The TR tube.
    (this multiple choice question has been scrambled)
  96. 8-16B6 A DC keep-alive potential:
    A. Is applied to a TR tube to make it more sensitive and partially ionizes the gas in a TR tube.
    B. Partially ionizes the gas in a TR tube, making it very sensitive to transmitter pulses.
    C. Fully ionizes the gas in a TR tube.
    D. Is applied to a TR tube to make it more sensitive.
    A. Is applied to a TR tube to make it more sensitive and partially ionizes the gas in a TR tube.
    (this multiple choice question has been scrambled)
  97. 8-17B1 What RADAR circuit determines the pulse repetition rate (PRR)?
    A. Discriminator.
    B. Artificial transmission line.
    C. Pulse-rate-indicator circuit.
    D. Timer (synchronizer circuit).
    D. Timer (synchronizer circuit).
    (this multiple choice question has been scrambled)
  98. 8-17B2 The triggering section is also known as the:
    A. PFN.
    B. Blocking oscillator.
    C. Timer circuit.
    D. Synchronizer.
    D. Synchronizer.
    (this multiple choice question has been scrambled)
  99. 8-17B3 Operation of any RADAR system begins in the:
    A. PFN.
    B. AFC.
    C. Magnetron.
    D. Triggering section.
    D. Triggering section.
    (this multiple choice question has been scrambled)
  100. 8-17B4 The timer circuit:
    A. Determines the pulse repetition rate (PRR).
    B. Determines range markers.
    C. Provides blanking and unblanking signals for the CRT.
    D. All of the above
    D. All of the above
  101. 8-17B5 Pulse RADARs require precise timing for their operation. Which type circuit below might best be used to provide these accurate timing pulses?
    A. AFC controlled sinewave oscillator.
    B. Triggered flip-flop type multivibrator.
    C. Non-symmetrical astable multivibrator.
    D. Single-swing blocking oscillator.
    D. Single-swing blocking oscillator.
    (this multiple choice question has been scrambled)
  102. 8-17B6 Unblanking pulses are produced by the timer circuit. Where are they sent?
    A. CRT.
    B. Discriminator.
    C. Mixer.
    D. IF amplifiers.
    A. CRT.
    (this multiple choice question has been scrambled)
  103. 8-18B1 An advantage of resonant charging is that it:
    A. Guarantees perfectly square output pulses.
    B. Reduces the high-voltage power supply requirements.
    C. Maintains a constant magnetron output frequency.
    D. Eliminates the need for a reverse current diode.
    B. Reduces the high-voltage power supply requirements.
    (this multiple choice question has been scrambled)
  104. 8-18B2 The characteristics of a field-effect transistor (FET) used in a modern RADAR switching power supply can be compared as follows:
    A. “On” state compares to an low resistance inductor. “Off” state compares to a 10-Megohm resistor.
    B. “On” state compares to a pure resistor. “Off” state compares to a mechanical relay.
    C. “On” state compares to a resistor. “Off” state compares to a capacitor.
    D. “On” state compares to a bipolar transistor. “Off” state compares to a 1-Megohm resistor.
    B. “On” state compares to a pure resistor. “Off” state compares to a mechanical relay.
    (this multiple choice question has been scrambled)
  105. 8-18B3 A pulse-width modulator in a switching power supply is used to:
    A. Vary the duty cycle of the regulator switch to control the output voltage.
    B. Vary the frequency of the switching regulator to control the output voltage.
    C. Provide the reference voltage for the regulator.
    D. Compare the reference voltage with the output voltage sample and produce an error voltage.
    A. Vary the duty cycle of the regulator switch to control the output voltage.
    (this multiple choice question has been scrambled)
  106. 8-18B4 In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when:
    A. The output voltage increases.
    B. The input voltage increases.
    C. The load current decreases.
    D. The load impedance decreases.
    D. The load impedance decreases.
    (this multiple choice question has been scrambled)
  107. 8-18B5 A major consideration for the use of a switching regulator power supply over a linear regulator is:
    A. The switching regulator can be used in nearly all applications requiring regulated voltage.
    B. The linear regulator does not require a transformer to step down AC line voltages to a usable level.
    C. The overall efficiency of a switching regulator is much higher than a linear power supply.
    D. The switching regulator has better regulation.
    C. The overall efficiency of a switching regulator is much higher than a linear power supply.
    (this multiple choice question has been scrambled)
  108. 8-18B6 Which of the following characteristics are true of a power MOSFET used in a RADAR switching supply?
    A. High input impedance; failure mode can be gate punch-through.
    B. High input impedance; failure mode can be thermal runaway.
    C. Low input impedance; failure mode can be gate punch-through.
    D. Low input impedance; failure mode can be gate breakdown.
    A. High input impedance; failure mode can be gate punch-through.
    (this multiple choice question has been scrambled)
  109. 8-19C1 Which of the following statements is true?
    A. The mixer provides a gain of at least 6 db.
    B. The I.F. amplifier is always a high gain, narrow bandwidth amplifier.
    C. The front end of the receiver does not provide any amplification to the RADAR signal.
    D. None of the above.
    C. The front end of the receiver does not provide any amplification to the RADAR signal.
    (this multiple choice question has been scrambled)
  110. 8-19C2 Logarithmic receivers:
    A. Should not be used in RADAR systems.
    B. Have low sensitivity.
    C. Can’t be damaged.
    D. Can’t be saturated.
    D. Can’t be saturated.
    (this multiple choice question has been scrambled)
  111. 8-19C3 RADAR receivers are similar to:
    A. FM receivers.
    B. HF receivers.
    C. T.V. receivers.
    D. Microwave receivers.
    D. Microwave receivers.
    (this multiple choice question has been scrambled)
  112. 8-19C4 What section of the receiving system sends signals to the display system?
    A. Video amplifier.
    B. Audio amplifier.
    C. I.F. Amplifier.
    D. Resolver.
    A. Video amplifier.
    (this multiple choice question has been scrambled)
  113. 8-19C5 What is the main difference between an analog and a digital receiver?
    A. Special amplification circuitry.
    B. The presence of decision circuitry to distinguish between “on” and “off” signal levels.
    C. An AGC stage is not required in a digital receiver.
    D. Digital receivers produce no distortion.
    B. The presence of decision circuitry to distinguish between “on” and “off” signal levels.
    (this multiple choice question has been scrambled)
  114. 8-19C6 In a RADAR receiver, the RF power amplifier:
    A. Does not exist.
    B. Is low gain.
    C. Is high gain.
    D. Requires wide bandwidth.
    A. Does not exist.
    (this multiple choice question has been scrambled)

  115. 8-20C1 The diagram in Fig. 8C9 shows a simplified RADAR mixer circuit using a crystal diode as the first detector. What is the output of the circuit when no echoes are being received?
    A. 4095 MHz CW.
    B. No output is developed.
    C. 60 MHz CW.
    D. 4155 MHz CW.
    B. No output is developed.
    (this multiple choice question has been scrambled)
  116. 8-20C2 In the receive mode, frequency conversion is generally accomplished by a:
    A. Ferrite device.
    B. Tunable wave-guide section.
    C. Pentagrid converter.
    D. Crystal diode.
    D. Crystal diode.
    (this multiple choice question has been scrambled)
  117. 8-20C3 An RF mixer has what purpose in a RADAR system?
    A. Mixes the CW transmitter output to form pulsed waves.
    B. Combines audio tones with RF to produce the RADAR signal.
    C. Prevents microwave oscillations from reaching the antenna.
    D. Converts a low-level signal to a different frequency.
    D. Converts a low-level signal to a different frequency.
    (this multiple choice question has been scrambled)
  118. 8-20C4 In a RADAR unit, the mixer uses a:
    A. Field-effect transistor.
    B. Microwave transistor.
    C. Silicon crystal or PIN diode.
    D. Pentagrid converter tube.
    C. Silicon crystal or PIN diode.
    (this multiple choice question has been scrambled)

  119. 8-20C5 What component of a RADAR receiver is represented by block 49 in Fig. 8A1?
    A. IF amplifier.
    B. Discriminator.
    C. Crystal detector (the mixer).
    D. Klystron.
    C. Crystal detector (the mixer).
    (this multiple choice question has been scrambled)
  120. 8-20C6 In a RADAR unit, the mixer uses:
    A. Silicon crystals.
    B. PIN diodes.
    C. PIN diodes and silicon crystals.
    D. Boettcher crystals.
    C. PIN diodes and silicon crystals.
    (this multiple choice question has been scrambled)
  121. 8-21C1 The error voltage from the discriminator is applied to the:
    A. Repeller (reflector) of the klystron.
    B. Magnetron.
    C. Grids of the IF amplifier.
    D. Grids of the RF amplifiers.
    A. Repeller (reflector) of the klystron.
    (this multiple choice question has been scrambled)
  122. 8-21C2 In a RADAR unit, the local oscillator is a:
    A. Klystron.
    B. Hydrogen Thyratron.
    C. Reactance tube modulator.
    D. Pentagrid converter tube.
    A. Klystron.
    (this multiple choice question has been scrambled)

  123. 8-21C3 What component of a RADAR receiver is represented by block 48 in Fig. 8A1?
    A. Discriminator.
    B. Crystal detector.
    C. Klystron (local oscillator).
    D. IF amplifier.
    C. Klystron (local oscillator).
    (this multiple choice question has been scrambled)
  124. 8-21C4 What device(s) could be used as the local oscillator in a RADAR receiver?
    A. Klystron and a Gunn Diode
    B. Klystron
    C. Thyratron
    D. Gunn diode
    A. Klystron and a Gunn Diode
    (this multiple choice question has been scrambled)
  125. 8-21C5 The klystron local oscillator is constantly kept on frequency by:
    A. The Automatic Frequency Control circuit.
    B. A feedback loop from the crystal detector.
    C. Constant manual adjustments.
    D. A feedback loop from the TR box.
    A. The Automatic Frequency Control circuit.
    (this multiple choice question has been scrambled)
  126. 8-21C6 How may the frequency of the klystron be varied?
    A. By changing the phasing of the buncher grids
    B. Small changes can be made by adjusting the anode voltage.
    C. Large changes can be made by adjusting the frequency.
    D. Small changes can be made by adjusting the repeller voltage and large changes can be made by adjusting the size of the resonant cavity.
    D. Small changes can be made by adjusting the repeller voltage and large changes can be made by adjusting the size of the resonant cavity.
    (this multiple choice question has been scrambled)
  127. 8-22C1 Overcoupling in a RADAR receiver will cause?
    A. Decrease noise.
    B. Increase the range of the IAGC.
    C. Oscillations.
    D. Improved target returns.
    C. Oscillations.
    (this multiple choice question has been scrambled)
  128. 8-22C2 The usual intermediate frequency of a shipboard RADAR unit is:
    A. 30 or 60 MHz.
    B. 120 MHz.
    C. 10.7 MHz.
    D. 455 kHz.
    A. 30 or 60 MHz.
    (this multiple choice question has been scrambled)
  129. 8-22C3 The I.F. Amplifier bandwidth is:
    A. Wide for long ranges and narrow for short ranges.
    B. Adjustable from the control panel.
    C. Constant for all ranges.
    D. Wide for short ranges and narrow for long ranges.
    D. Wide for short ranges and narrow for long ranges.
    (this multiple choice question has been scrambled)
  130. 8-22C4 A logarithmic IF amplifier is preferable to a linear IF amplifier in a RADAR receiver because it:
    A. Has higher gain.
    B. Has a lower noise figure.
    C. Has a greater dynamic range.
    D. Is more easily aligned.
    C. Has a greater dynamic range.
    (this multiple choice question has been scrambled)
  131. 8-22C5 The high-gain IF amplifiers in a RADAR receiver may amplify a 2 microvolt input signal to an output level of 2 volts. This amount of amplification represents a gain of:
    A. 60 db.
    B. 1,000 db.
    C. 120 db.
    D. 100 db.
    C. 120 db.
    (this multiple choice question has been scrambled)
  132. 8-22C6 In a RADAR receiver AGC and IAGC can vary between:
    A. 10 and 15 db.
    B. 20 and 40 db.
    C. 5 and 30 db.
    D. 30 and 60 db.
    B. 20 and 40 db.
    (this multiple choice question has been scrambled)
  133. 8-23C1 Which of the following statements is correct?
    A. The video amplifier is located between the mixer and the I.F. amplifier.
    B. The video amplifier is located between the local oscillator and the mixer.
    C. The video amplifier operates between 60 MHz and 120 Mhz.
    D. The video amplifier is located between the I.F. amplifier and the display system.
    D. The video amplifier is located between the I.F. amplifier and the display system.
    (this multiple choice question has been scrambled)
  134. 8-23C2 Video amplifiers in pulse RADAR receivers must have a broad bandwidth because:
    A. Weak pulses must be amplified.
    B. High frequency sine waves must be amplified.
    C. The RADARs operate at PRFs above 100.
    D. The pulses produced are normally too wide for video amplification.
    A. Weak pulses must be amplified.
  135. 8-23C3 In video amplifiers, compensation for the input and output stage capacitances must be accomplished to prevent distorting the video pulses. This compensation is normally accomplished by connecting:
    A. Resistances in parallel with both the input and output capacitances.
    B. An inductor in series with the input capacitance and an inductor in parallel with the output capacitance.
    C. An inductor in parallel with the input capacitance and an inductor in series with the output capacitance.
    D. Inductors in parallel with both the input and output capacitances.
    B. An inductor in series with the input capacitance and an inductor in parallel with the output capacitance.
    (this multiple choice question has been scrambled)
  136. 8-23C4 Which of the following signals is not usually an input to the video amplifier?
    A. Brilliance.
    B. Range.
    C. Contrast.
    D. Resolver.
    D. Resolver.
    (this multiple choice question has been scrambled)
  137. 8-23C5 Which of the following signals are usually an input to the video amplifier?
    A. Range.
    B. Brilliance.
    C. Contrast.
    D. All of the above.
    D. All of the above.
  138. 8-23C6 The video (second) detector in a pulse modulated RADAR system would most likely use a/an:
    A. Diode detector.
    B. Infinite impedance detector.
    C. Discriminator detector.
    D. Ratio detector.
    A. Diode detector.
    (this multiple choice question has been scrambled)
  139. 8-24C1 The AFC system is used to:
    A. Control the frequency of the klystron.
    B. Control the receiver gain.
    C. Control the frequency of the incoming pulses.
    D. Control the frequency of the magnetron.
    A. Control the frequency of the klystron.
    (this multiple choice question has been scrambled)
  140. 8-24C2 A circuit used to develop AFC voltage in a RADAR receiver is called the:
    A. Peak detector.
    B. Crystal mixer.
    C. Second detector.
    D. Discriminator.
    D. Discriminator.
    (this multiple choice question has been scrambled)
  141. 8-24C3 In the AFC system, the discriminator compares the frequencies of the:
    A. Magnetron and video amplifier.
    B. Magnetron and crystal detector.
    C. PRR generator and magnetron.
    D. Magnetron and klystron.
    D. Magnetron and klystron.
    (this multiple choice question has been scrambled)
  142. 8-24C4 An AFC system keeps the receiver tuned to the transmitted signal by varying the frequency of the:
    A. IF amplifier stage.
    B. Local oscillator.
    C. Magnetron.
    D. Cavity duplexer.
    B. Local oscillator.
    (this multiple choice question has been scrambled)
  143. 8-24C5 A RADAR transmitter is operating on 3.0 GHz and the reflex klystron local oscillator, operating at 3.060 GHz, develops a 60 MHz IF. If the magnetron drifts higher in frequency, the AFC system must cause the klystron repeller plate to become:
    A. Less negative.
    B. More positive.
    C. Less positive.
    D. More negative.
    D. More negative.
    (this multiple choice question has been scrambled)

  144. 8-24C6 What component is block 50 in Fig. 8A1?
    A. AFC amplifier.
    B. Discriminator.
    C. Crystal detector.
    D. IF amplifier.
    B. Discriminator.
    (this multiple choice question has been scrambled)
  145. 8-25C1 The STC circuit is used to:
    A. Increase receiver stability.
    B. Increase receiver sensitivity.
    C. Decrease sea return on a RADAR receiver.
    D. Increase receiver selectivity.
    C. Decrease sea return on a RADAR receiver.
    (this multiple choice question has been scrambled)
  146. 8-25C2 The STC circuit:
    A. Increases the sensitivity of the receiver for close targets.
    B. Helps to increase the bearing resolution of targets.
    C. Decreases sea return on the PPI scope.
    D. Increases sea return on the PPI scope.
    C. Decreases sea return on the PPI scope.
    (this multiple choice question has been scrambled)
  147. 8-25C3 Sea return is:
    A. Sea water that gets into the antenna system.
    B. The return echo from a target at sea.
    C. The reflection of RADAR signals from nearby waves.
    D. None of the above.
    C. The reflection of RADAR signals from nearby waves.
    (this multiple choice question has been scrambled)
  148. 8-25C4 Sea clutter on the RADAR scope cannot be effectively reduced using front panel controls. What circuit would you suspect is faulty?
    A. Intermediate Frequency (IF) circuit.
    B. Fast Time Constant (FTC) circuit.
    C. Sensitivity Time Control (STC) circuit.
    D. False Target Eliminator (FTE) circuit.
    C. Sensitivity Time Control (STC) circuit.
    (this multiple choice question has been scrambled)
  149. 8-25C5 What circuit controls the suppression of sea clutter?
    A. Local oscillator.
    B. EBL circuit.
    C. STC circuit.
    D. Audio amplifier.
    C. STC circuit.
    (this multiple choice question has been scrambled)
  150. 8-25C6 The sensitivity time control (STC) circuit:
    A. Decreases the sensitivity of the transmitter for close objects.
    B. Increases the sensitivity of the receiver for distant objects.
    C. Decreases the sensitivity of the receiver for close objects.
    D. Increases the sensitivity of the receiver for close objects.
    C. Decreases the sensitivity of the receiver for close objects.
    (this multiple choice question has been scrambled)
  151. 8-26C1 Prior to making “power-on” measurements on a switching power supply, you should be familiar with the supply because of the following:
    A. If it does not use a line isolation transformer you may destroy the supply with grounded test equipment.
    B. So that measurements can be made without referring to the schematic.
    C. You need to know where the filter capacitors are so they can be discharged.
    D. It is not possible to cause a component failure by using ungrounded test equipment.
    A. If it does not use a line isolation transformer you may destroy the supply with grounded test equipment.
    (this multiple choice question has been scrambled)
  152. 8-26C2 A constant frequency switching power supply regulator with an input voltage of 165 volts DC, and a switching frequency of 20 kHz, has an “ON” time of 27 microseconds when supplying 1 ampere to its load. What is the output voltage across the load?
    A. 89.1 volts DC.
    B. 305.55 volts DC.
    C. 165 volts DC.
    D. It cannot be determined with the information given.
    A. 89.1 volts DC.
    (this multiple choice question has been scrambled)

  153. 8-26C3 The circuit shown in Fig. 8C10 is the output of a switching power supply. Measuring from the junction of CR6, CR7 and L1 to ground with an oscilloscope, what waveform would you expect to see?
    A. Pulsating DC much higher than line frequency.
    B. Filtered DC.
    C. Pulsating DC at line frequency.
    D. AC at line frequency.
    A. Pulsating DC much higher than line frequency.
    (this multiple choice question has been scrambled)

  154. 8-26C4 With regard to the comparator shown in Fig. 8C11, the input is a sinusoid. Nominal high level output of the comparator is 4.5 volts. Choose the most correct statement regarding the input and output.
    A. The rising edge of the output waveform trails the positive peak of the input waveform by 45 degrees.
    B. The leading edge of the output waveform occurs 180 degrees after positive zero crossing of the input waveform.
    C. The rising edge of the output waveform trails the positive zero crossing of the input waveform by 45 degrees.
    D. The rising edge of the output waveform trails the negative zero crossing of the input waveform by 45 degrees.
    B. The leading edge of the output waveform occurs 180 degrees after positive zero crossing of the input waveform.
    (this multiple choice question has been scrambled)
  155. 8-26C5 When monitoring the gate voltage of a power MOSFET in the switching power supply of a modern RADAR, you would expect to see the gate voltage change from “low” to “high” by how much?
    A. 300 microvolts to 700 microvolts.
    B. Greater than 2 volts.
    C. 1 volt to 2 volts.
    D. 1.0 volt to 20.0 volts.
    B. Greater than 2 volts.
    (this multiple choice question has been scrambled)

  156. 8-26C6 The nominal output high of the comparator shown in Fig. 8C11 is 4.5 volts. Choose the most correct statement which describes the trip points.
    A. Upper trip point is 4.5 volts. Lower trip point is approximately 0 volts.
    B. Upper trip point is 2.5 volts. Lower trip point is approximately 2.0 volts.
    C. Upper trip point is +1.285 volts. Lower trip point is -1.285 volts.
    D. Upper trip point is 900 microvolts. Lower trip point is approximately 0 volts.
    C. Upper trip point is +1.285 volts. Lower trip point is -1.285 volts.
    (this multiple choice question has been scrambled)
  157. 8-27C1 One of the best methods of reducing noise in a RADAR receiver is?
    A. Isolation.
    B. Replacing the resonant cavity.
    C. Changing the IF strip.
    D. Changing the frequency.
    A. Isolation.
    (this multiple choice question has been scrambled)
  158. 8-27C2 The primary cause of noise in a RADAR receiver can be attributed to:
    A. Electrical causes.
    B. Atmospheric changes.
    C. Thermal noise caused by RADAR receiver components.
    D. Poor grounding.
    C. Thermal noise caused by RADAR receiver components.
    (this multiple choice question has been scrambled)
  159. 8-27C3 Noise can appear on the LCD as:
    A. Erratic video and sharp changes in intensity.
    B. Black spots on the screen.
    C. Changes in bearings.
    D. None of the above.
    A. Erratic video and sharp changes in intensity.
    (this multiple choice question has been scrambled)
  160. 8-27C4 RADAR interference on a communications receiver appears as:
    A. A varying tone.
    B. Static.
    C. A hissing tone.
    D. A steady tone.
    D. A steady tone.
    (this multiple choice question has been scrambled)
  161. 8-27C5 In a RADAR receiver the most common types of interference are?
    A. Sea return and thermal.
    B. Weather and electrical.
    C. Weather and sea return.
    D. Jamming and electrical.
    C. Weather and sea return.
    (this multiple choice question has been scrambled)
  162. 8-27C6 Noise can:
    A. Increase RADAR transmitter interference.
    B. Mask larger targets.
    C. Mask small targets.
    D. Change bearings.
    C. Mask small targets.
    (this multiple choice question has been scrambled)
  163. 8-28C1 The purpose of the discriminator circuit in a RADAR set is to:
    A. Demodulate or remove the intelligence from the FM signal.
    B. Discriminate against nearby objects.
    C. Generate a corrective voltage for controlling the frequency of the klystron local oscillator.
    D. Discriminate against two objects with very similar bearings.
    C. Generate a corrective voltage for controlling the frequency of the klystron local oscillator.
    (this multiple choice question has been scrambled)
  164. 8-28C2 The MTI circuit:
    A. Acts as a mixer in a RADAR receiver.
    B. Is used to monitor transmitter interference.
    C. Will pick up targets, which are not in motion.
    D. Is a filter, which blocks out stationary targets, allowing only moving targets to be detected.
    D. Is a filter, which blocks out stationary targets, allowing only moving targets to be detected.
    (this multiple choice question has been scrambled)
  165. 8-28C3 Where is a RF attenuator used in a RADAR unit?
    A. Between the magnetron and the AFC section of the receiver.
    B. Between the antenna and the receiver.
    C. Between the magnetron and the antenna.
    D. Between the AFC section and the klystron.
    A. Between the magnetron and the AFC section of the receiver.
    (this multiple choice question has been scrambled)
  166. 8-28C4 The condition known as “glint” refers to a shifting of clutter with each RADAR pulse and can be caused by a:
    A. Improperly functioning MTI filter.
    B. Memory failure.
    C Low AFC voltage.
    D. Interference from electrical equipment.
    A. Improperly functioning MTI filter.
  167. 8-28C5 An ion discharge (TR) cell is used to:
    A. Tune the local oscillator of the RADAR receiver.
    B. Lower the noise figure of the receiver.
    C. Protect the transmitter from high SWRs.
    D. Protect the receiver mixer during the transmit pulse.
    D. Protect the receiver mixer during the transmit pulse.
    (this multiple choice question has been scrambled)
  168. 8-28C6 When the receiver employs an MTI circuit:
    A. Only moving targets will be displayed.
    B. The receiver AGC circuits are disabled.
    C. The receiver gain increases with time.
    D. Ground clutter will be free of “rabbits.”
    A. Only moving targets will be displayed.
    (this multiple choice question has been scrambled)
  169. 8-29D1 Modern liquid crystal displays have a pixel count of:
    A. Can have no more than 125 pixels per inch.
    B. Can implement 1,000 pixels per inch.
    C. Greater than 200 pixels per inch.
    D. Greater than 50 pixels per inch.
    C. Greater than 200 pixels per inch.
    (this multiple choice question has been scrambled)
  170. 8-29D2 Voltages used in CRT anode circuits are in what range of value?
    A. 10-50 kV.
    B. 20-50 mV.
    C. 200-1000 V.
    D. 0.5-10 mV.
    A. 10-50 kV.
    (this multiple choice question has been scrambled)
  171. 8-29D3 The purpose of the aquadag coating on the CRT is:
    A. To protect the electrons from strong electric fields.
    B. To act as a second anode.
    C. To attract secondary emissions from the CRT screen.
    D. All of the above
    D. All of the above
  172. 8-29D4 LCD patterns are formed when:
    A. When the ships antenna’s bearing is true North.
    B. Current passes through the crystal causing them to align.
    C. When the deflection coils are resonant.
    D. When voltage is reduced to the raster scan display.
    B. Current passes through the crystal causing them to align.
    (this multiple choice question has been scrambled)
  173. 8-29D5 In a raster-type display, the electron beam is scanned:
    A. From one specified X-Y coordinate to the next.
    B. In a rotating pattern which follows the antenna position.
    C. From the center of the display to the outer edges.
    D. Horizontally and vertically across the CRT face.
    D. Horizontally and vertically across the CRT face.
    (this multiple choice question has been scrambled)
  174. 8-29D6 Select the statement, which is most correct regarding a raster scan display.
    A. Raster displays are the same as conventional T.V. receivers.
    B. Raster scanning is not used in RADAR systems.
    C. Raster scanning is controlled by clock pulses and requires an address bus.
    D. The scan rate for a RADAR system is 30 frames per second.
    C. Raster scanning is controlled by clock pulses and requires an address bus.
    (this multiple choice question has been scrambled)
  175. 8-30D1 What are the usual input signals to the video amplifier?
    A. Low level video.
    B. Fixed range rings.
    C. Variable range rings.
    D. All of the above.
    D. All of the above.
  176. 8-30D2 Which of the following would not normally be an input to the video amplifier?
    A. Fixed range rings.
    B. Variable range rings.
    C. Resolver signal.
    D. Low level video.
    C. Resolver signal.
    (this multiple choice question has been scrambled)
  177. 8-30D3 The purpose of the sweep amplifier is to:
    A. Drive the resolver coils.
    B. Drive the CRT deflection coils.
    C. Increase the power of the video amplifier.
    D. All of the above.
    B. Drive the CRT deflection coils.
    (this multiple choice question has been scrambled)
  178. 8-30D4 How many deflection coils are driven by the sweep amplifier?
    A. 2
    B. 1
    C. 3
    D. 4
    A. 2
    (this multiple choice question has been scrambled)
  179. 8-30D5 The main purpose of the sweep generator is to provide:
    A. The drive signal to the sweep amplifier.
    B. Range rings.
    C. Composite video to the cathode of the CRT.
    D. Antenna information.
    A. The drive signal to the sweep amplifier.
    (this multiple choice question has been scrambled)
  180. 8-30D6 The main purpose of the video amplifier is to provide:
    A. Provide the drive signal to the sweep amplifier.
    B. Resolver signals
    C. Antenna X and Y signals.
    D. Composite video to the cathode of the CRT.
    D. Composite video to the cathode of the CRT.
    (this multiple choice question has been scrambled)
  181. 8-31D1 Timing circuits are used to provide what function?
    A. Control the North Up presentation.
    B. Develop synchronizing pulses for the transmitter system.
    C. Synchronize the antenna and display system.
    D. Adjust the sea return.
    B. Develop synchronizing pulses for the transmitter system.
    (this multiple choice question has been scrambled)
  182. 8-31D2 The circuit that develops timing signals is called the:
    A. Synchronizer.
    B. Pulse forming network.
    C. Video amplifier.
    D. Resolver.
    A. Synchronizer.
    (this multiple choice question has been scrambled)
  183. 8-31D3 Which of the following functions is not affected by the timing circuit?
    A. Modulation.
    B. Sweep drive.
    C. Resolver output.
    D. Pulse repetition frequency.
    C. Resolver output.
    (this multiple choice question has been scrambled)
  184. 8-31D4 The synchronizer primarily affects the following circuit or function:
    A. Modulator.
    B. Mixer.
    C. Receiver.
    D. I.F. Amplifier.
    A. Modulator.
    (this multiple choice question has been scrambled)
  185. 8-31D5 The output from the synchronizer usually consists of a:
    A. Pulse or square wave.
    B. Triangle wave.
    C. Sine wave.
    D. None of the above.
    A. Pulse or square wave.
    (this multiple choice question has been scrambled)
  186. 8-31D6 The sweep drive is initiated by what circuit?
    A. Synchronizer.
    B. Resolver.
    C. Video amplifier.
    D. Sweep amplifier.
    A. Synchronizer.
    (this multiple choice question has been scrambled)
  187. 8-32D1 Accurate range markers must be developed using very narrow pulses. A circuit that could be used to provide these high-quality pulses for the CRT is a:
    A. Blocking oscillator.
    B. Triggered bi-stable multivibrator.
    C. Monostable multivibrator.
    D. Ringing oscillator.
    A. Blocking oscillator.
    (this multiple choice question has been scrambled)
  188. 8-32D2 Range markers are determined by:
    A. The magnetron.
    B. The timer.
    C. The CRT.
    D. The video amplifier.
    B. The timer.
    (this multiple choice question has been scrambled)
  189. 8-32D3 A gated LC oscillator, operating at 27 kHz, is being used to develop range markers. If each cycle is converted to a range mark, the range between markers will be:
    A. 6 nautical miles.
    B. 12 nautical miles.
    C. 8 nautical miles.
    D. 3 nautical miles.
    D. 3 nautical miles.
    (this multiple choice question has been scrambled)
  190. 8-32D4 What would be the frequency of a range ring marker oscillator generating range rings at 10 nautical miles intervals?
    A. 24 kHz
    B. 8 kHz
    C. 12 kHz
    D. 16 kHz
    B. 8 kHz
    (this multiple choice question has been scrambled)
  191. 8-32D5 What is the distance between range markers if the controlling oscillator is operating at 20 kHz?
    A. 1 nautical miles.
    B. 2 nautical miles.
    C. 4 nautical miles.
    D. 8 nautical miles.
    C. 4 nautical miles.
    (this multiple choice question has been scrambled)
  192. 8-32D6 What would be the frequency of a range ring marker oscillator generating range rings at intervals of 0.25 nautical miles?
    A. 161 kHz
    B. 322 kHz
    C. 644 kHz
    D. 1288 kHz
  193. 8-33D1 The variable range marker signal is normally fed to the input of the:
    A. Sweep amplifier.
    B. Range ring oscillator.
    C. Low voltage power supply regulator.
    D. Video amplifier.
    D. Video amplifier.
    (this multiple choice question has been scrambled)
  194. 8-33D2 The purpose of the variable range marker is to:
    A. Indicate the distance between two different targets.
    B. Provide a means of calibrating the fixed range rings.
    C. Provide a bearing line between own ship and a moving target.
    D. Provide an accurate means of determining the range of a moving target.
    D. Provide an accurate means of determining the range of a moving target.
    (this multiple choice question has been scrambled)
  195. 8-33D3 How is the variable range marker usually adjusted for accuracy?
    A. Adjusting the frequency of the VRM oscillator at the minimum range.
    B. The minimum and maximum ranges are aligned with the matching fixed range ring.
    C. Adjusting the frequency of the VRM oscillator at the maximum range.
    D. Adjusting the readout to match at the median range ring.
    B. The minimum and maximum ranges are aligned with the matching fixed range ring.
    (this multiple choice question has been scrambled)
  196. 8-33D4 The panel control for the variable range marker is normally a:
    A. Variable capacitance.
    B. Variable resistor.
    C. Variable resolver.
    D. Variable inductance.
    B. Variable resistor.
    (this multiple choice question has been scrambled)
  197. 8-33D5 An important component of the VRM system is the:
    A. Resolver.
    B. STC sensitivity control.
    C. Shift register.
    D. Interference rejection circuit.
    C. Shift register.
    (this multiple choice question has been scrambled)
  198. 8-33D6 Which of the following statements about the Variable Range Marker system is correct?
    A. The VRM system develops a single adjustable range ring.
    B. The VRM is an auxiliary output of the fixed range marker oscillator.
    C. The VRM system is calibrated using a frequency counter.
    D. The VRM system is controlled by a crystal oscillator.
    A. The VRM system develops a single adjustable range ring.
    (this multiple choice question has been scrambled)
  199. 8-34D1 The purpose of the Electronic Bearing Line is to:
    A. Indicate your own vessel’s heading.
    B. Display the range of a specific target.
    C. Indicate True North.
    D. Measure the bearing of a specific target.
    D. Measure the bearing of a specific target.
    (this multiple choice question has been scrambled)
  200. 8-34D2 The Electronic Bearing Line is:
    A. Used to mark a target to obtain the distance.
    B. A line indicating True North.
    C. The ships heading line.
    D. A line from your own vessel to a specific target.
    D. A line from your own vessel to a specific target.
    (this multiple choice question has been scrambled)
  201. 8-34D3 Which of the following inputs is required to indicate azimuth?
    A. Resolver.
    B. Range rings.
    C. Gyro signals.
    D. Synchronizer
    C. Gyro signals.
    (this multiple choice question has been scrambled)
  202. 8-34D4 Bearing information from the gyro is used to provide the following:
    A. The range of a selected target.
    B. Vessel’s own heading.
    C. The heading of the nearest target.
    D. Range and bearing to the nearest target.
    B. Vessel’s own heading.
    (this multiple choice question has been scrambled)
  203. 8-34D5 Which of the following statements about “true bearing” is correct?
    A. The relative bearing of the nearest target is indicated.
    B. The ship’s heading flasher is at the top of the screen.
    C. True North is at the top of the screen and the heading flasher indicates the vessel’s course.
    D. The true bearing of the nearest target is indicated.
    C. True North is at the top of the screen and the heading flasher indicates the vessel’s course.
    (this multiple choice question has been scrambled)
  204. 8-34D6 A true bearing presentation appears as follows:
    A. The course of the five closest targets is displayed.
    B. The course and distance of the closest target is displayed.
    C. North is at the top of the display and the ship’s heading flasher indicates the vessel’s course.
    D. The bow of the vessel always points up.
    C. North is at the top of the display and the ship’s heading flasher indicates the vessel’s course.
    (this multiple choice question has been scrambled)
  205. 8-35D1 In a digitized RADAR, the 360 degree sweep is divided into how many digitized segments?
    A. 4,096
    B. 16
    C. 255
    D. 64
    A. 4,096
    (this multiple choice question has been scrambled)
  206. 8-35D2 While troubleshooting a memory problem in a raster scan RADAR, you discover that the “REFRESH” cycle is not operating correctly. What type of memory circuit are you working on?
    A. PROM
    B. DRAM
    C. SRAM
    D. ROM
    B. DRAM
    (this multiple choice question has been scrambled)
  207. 8-35D3 The term DRAM stands for:
    A. Dynamic random access memory.
    B. Digital refresh access memory.
    C. Digital response area motion.
    D. Digital recording access memory.
    A. Dynamic random access memory.
    (this multiple choice question has been scrambled)
  208. 8-35D4 How does the dual memory function reduce sea clutter?
    A. Successive sweeps are digitized and compared. Only signals appearing in both sweeps are displayed.
    B. The dual memory system makes the desired targets larger.
    C. It reduces receiver gain for closer signals.
    D. It increases receiver gain for real targets.
    A. Successive sweeps are digitized and compared. Only signals appearing in both sweeps are displayed.
    (this multiple choice question has been scrambled)
  209. 8-35D5 How many sequential memory cells with target returns are required to display the target?
    A. 4
    B. 1
    C. 8
    D. 2
    D. 2
    (this multiple choice question has been scrambled)
  210. 8-35D6 What is the primary purpose of display system memory?
    A. Store target bearings.
    B. Display stationary targets.
    C. Eliminate fluctuating targets such as sea return.
    D. Display the last available targets prior to a power dropout.
    C. Eliminate fluctuating targets such as sea return.
    (this multiple choice question has been scrambled)
  211. 8-36D1 The ship’s speed indication on the ARPA display can be set manually, but does not change with changes in the vessel’s speed. What other indication would point to a related equipment failure?
    A. “LOG OUT” is displayed on the ARPA indicator.
    B. “NORTH UP” is displayed on the ARPA indicator.
    C. “TARGET LOST” is displayed on the ARPA indicator.
    D. “GYRO OUT” is displayed on the ARPA indicator.
    A. “LOG OUT” is displayed on the ARPA indicator.
    (this multiple choice question has been scrambled)
  212. 8-36D2 What does the term ARPA/CAS refer to?
    A. The basic RADAR system in operation.
    B. The device which displays the optional U.S.C.G. Acquisition and Search RADAR information on a CRT display.
    C. The device which acquires and tracks targets that are displayed on the RADAR indicator’s CRT.
    D. The device which allows the ship to automatically steer around potential hazards.
    C. The device which acquires and tracks targets that are displayed on the RADAR indicator’s CRT.
    (this multiple choice question has been scrambled)
  213. 8-36D3 Which of the following would not be considered an input to the computer of a collision avoidance system?
    A. Own ship’s exact position from navigation satellite receiver.
    B. Own ship’s gyrocompass heading.
    C. Own ship’s wind velocity from an anemometer.
    D. Own ship’s speed from Doppler log.
    C. Own ship’s wind velocity from an anemometer.
    (this multiple choice question has been scrambled)
  214. 8-36D4 Which answer best describes a line on the display which indicates a target’s position. The speed is shown by the length of the line and the course by the direction of the line.
    A. Vector.
    B. Range Marker.
    C. Electronic Bearing Line.
    D. Heading Marker.
    A. Vector.
    (this multiple choice question has been scrambled)
  215. 8-36D5 What is the purpose or function of the “Trial Mode” used in most ARPA equipment?
    A. It selects trial dots for targets’ recent past positions.
    B. It is used to allow results of proposed maneuvers to be assessed.
    C. None of these.
    D. It is used to display target position and your own ship’s data such as TCPA, CPA, etc.
    B. It is used to allow results of proposed maneuvers to be assessed.
    (this multiple choice question has been scrambled)
  216. 8-36D6 The ARPA term CPA refers to:
    A. Direction of target relative to your own ship’s direction.
    B. The closest point a ship or target will approach your own ship.
    C. The furthest point a ship or target will get to your own ship’s bow.
    D. The combined detection and processing of targets.
    B. The closest point a ship or target will approach your own ship.
    (this multiple choice question has been scrambled)
  217. 8-37D1 The display power supply provides the following:
    A. 5 volts DC for logic circuits and  12 volts DC for analog and sweep circuits.
    B. +18 volts DC for the pulse forming network.
    C. 80 volts AC for the antenna resolver circuits.
    D. All of the above
    A. 5 volts DC for logic circuits and  12 volts DC for analog and sweep circuits.
    (this multiple choice question has been scrambled)
  218. 8-37D2 The display power supply provides the following:
    A. 5 volts DC for logic circuits.
    B.  12 volts DC for analog and sweep circuits.
    C. 17kV DC for the CRT HV anode.
    D. All of the above
    D. All of the above
  219. 8-37D3 In a display system power supply what is the purpose of the chopper?
    A. It regulates the 5 volt DC output.
    B. It acts as an electronic switch between the raw DC output and the inverter.
    C. It interrupts the AC supply line at a varying rate depending on the load demands.
    D. It pre-regulates the AC input.
    B. It acts as an electronic switch between the raw DC output and the inverter.
    (this multiple choice question has been scrambled)
  220. 8-37D4 In a display system power supply, what is the purpose of the inverter?
    A. Produces the pulsed DC input voltage to the power transformer.
    B. Provides the dual polarity 12 volt DC supply.
    C. Acts as the voltage regulator for the 5 volt DC supply.
    D. Inverts the polarity of the DC voltage applied to the voltage regulators.
    A. Produces the pulsed DC input voltage to the power transformer.
    (this multiple choice question has been scrambled)
  221. 8-37D5 What would be a common switching frequency for a display system power supply?
    A. 120 kHz
    B. 18 kHz
    C. 120 Hz
    D. 60 kHz
    B. 18 kHz
    (this multiple choice question has been scrambled)
  222. 8-37D6 What display system power supply output would use a tripler circuit?
    A. The resolver drive
    B. The sweep circuit supply.
    C. The logic circuit supply.
    D. The HV supply for the CRT anode.
    D. The HV supply for the CRT anode.
    (this multiple choice question has been scrambled)
  223. 8-38D1 The heading flash is a momentary intensification of the sweep line on the PPI presentation. Its function is to:
    A. Inform the operator when the antenna is pointed to the rear of the ship.
    B. Inform the operator of the dead-ahead position on the PPI scope.
    C. Alert the operator when a target is within range.
    D. Alert the operator when shallow water is near.
    B. Inform the operator of the dead-ahead position on the PPI scope.
    (this multiple choice question has been scrambled)
  224. 8-38D2 The major advantage of digitally processing a RADAR signal is:
    A. Rectangular display geometry is far easier to read on the CRT.
    B. Enhancement of weak target returns.
    C. An improved operator interface.
    D. Digital readouts appear on the RADAR display.
    B. Enhancement of weak target returns.
    (this multiple choice question has been scrambled)
  225. 8-38D3 In order to ensure that a practical filter is able to remove undesired components from the output of an analog-to-digital converter, the sampling frequency should be:
    A. Two times the highest component of the analog frequency.
    B. Greater than two times the highest component of the sampled frequency.
    C. The same as the lowest component of the analog frequency.
    D. The same as the highest component of the sampled frequency.
    B. Greater than two times the highest component of the sampled frequency.
    (this multiple choice question has been scrambled)
  226. 8-38D4 Bearing resolution is:
    A. The ability to distinguish two targets of different elevations.
    B. The ability to distinguish two targets of different distances.
    C. The ability to distinguish two targets of different size.
    D. The ability to distinguish two adjacent targets of equal distance.
    D. The ability to distinguish two adjacent targets of equal distance.
    (this multiple choice question has been scrambled)
  227. 8-38D5 The output of an RC integrator, when driven by a square wave with a period of much less than one time constant is a:
    A. Series of narrow spikes.
    B. Sine wave.
    C. Sawtooth wave.
    D. Triangle wave.
    D. Triangle wave.
    (this multiple choice question has been scrambled)
  228. 8-38D6 How do you eliminate stationary objects such as trees, buildings, bridges, etc., from the PPI presentation?
    A. Use a discriminator as a second detector.
    B. Calibrate the local oscillator.
    C. Calibrate the IF circuit.
    D. Remove the discriminator from the unit.
    A. Use a discriminator as a second detector.
    (this multiple choice question has been scrambled)
  229. 8-39E1 Slotted waveguide arrays, when fed from one end exhibit:
    A. High VSWR.
    B. Frequency scan.
    C. Poor performance in rain.
    D. A narrow elevation beam.
    B. Frequency scan.
    (this multiple choice question has been scrambled)
  230. 8-39E2 A typical shipboard RADAR antenna is a:
    A. Rotary parabolic transducer.
    B. Slotted waveguide array.
    C. Phased planar array.
    D. Dipole.
    B. Slotted waveguide array.
    (this multiple choice question has been scrambled)
  231. 8-39E3 Good bearing resolution largely depends upon:
    A. A high transmitter output reading.
    B. A high duty cycle.
    C. A narrow antenna beam in the vertical plane.
    D. A narrow antenna beam in the horizontal plane.
    D. A narrow antenna beam in the horizontal plane.
    (this multiple choice question has been scrambled)
  232. 8-39E4 The center of the transmitted lobe from a slotted waveguide array is:
    A. Several degrees offset from a line perpendicular to the antenna.
    B. Perpendicular to the antenna.
    C. Maximum at the right hand end.
    D. Maximum at the left hand end.
  233. 8-39E5 How does antenna length affect the horizontal beamwidth of the transmitted signal?
    A. The longer the antenna the wider the horizontal beamwidth.
    B. The horizontal beamwidth is not affected by the antenna length.
    C. The longer the antenna the narrower the horizontal beamwidth.
    D. None of the above.
    C. The longer the antenna the narrower the horizontal beamwidth.
    (this multiple choice question has been scrambled)
  234. 8-39E6 What is the most common type of RADAR antenna used aboard commercial maritime vessels?
    A. Parabolic.
    B. Multi-element Yagi array.
    C. Slotted waveguide array.
    D. Truncated parabolic.
    C. Slotted waveguide array.
    (this multiple choice question has been scrambled)
  235. 8-40E1 The VSWR of a microwave transmission line device might be measured using:
    A. A network analyzer.
    B. A dual directional coupler and a power meter.
    C. A dual directional coupler, a power meter, and a network analyzer.
    D. A spectrum analyzer.
    C. A dual directional coupler, a power meter, and a network analyzer.
    (this multiple choice question has been scrambled)
  236. 8-40E2 The impedance total (ZO) of a transmission line can be calculated by ZO = √L/C when L and C are known. When a section of transmission line contains 250 microhenries of L and 1000 picofarads of C, its impedance total (ZO) will be:
    A. 50 ohms.
    B. 1,000 ohms.
    C. 500 ohms.
    D. 250 ohms.
    C. 500 ohms.
    (this multiple choice question has been scrambled)
  237. 8-40E3 If long-length transmission lines are not properly shielded and terminated:
    A. Overmodulation might result.
    B. The silicon crystals can be damaged.
    C. Minimal RF loss can result.
    D. Communications receiver interference might result.
    D. Communications receiver interference might result.
    (this multiple choice question has been scrambled)
  238. 8-40E4 A certain length of transmission line has a characteristic impedance of 72 ohms. If the line is cut at its center, each half of the transmission line will have a ZO of:
    A. 144 ohms.
    B. 72 ohms.
    C. 36 ohms.
    D. The exact length must be known to determine Zo.
    B. 72 ohms.
    (this multiple choice question has been scrambled)
  239. 8-40E5 Standing waves on a transmission line may be an indication that:
    A. Some of the energy is not absorbed by the load.
    B. All energy is being delivered to the load.
    C. The line is terminated in impedance equal to ZO.
    D. Source and surge impedances are equal to ZO and ZL.
    A. Some of the energy is not absorbed by the load.
    (this multiple choice question has been scrambled)
  240. 8-40E6 What precautions should be taken with horizontal waveguide runs?
    A. They should be sloped slightly downwards at the elbow and a small drain hole drilled in the elbow.
    B. They should be absolutely level.
    C. They should not exceed 10 feet in length.
    D. None of the above.
    A. They should be sloped slightly downwards at the elbow and a small drain hole drilled in the elbow.
    (this multiple choice question has been scrambled)
  241. 8-41E1 The position of the PPI scope sweep must indicate the position of the antenna. The sweep and antenna positions are frequently kept in synchronization by the use of:
    A. Servo systems.
    B. Differential amplifiers.
    C. DC positioning motors.
    D. Synchro systems.
    D. Synchro systems.
    (this multiple choice question has been scrambled)
  242. 8-41E2 On a basic synchro system, the angular information is carried on the:
    A. Rotor lines.
    B. Stator lines.
    C. Deflection coils.
    D. DC feedback signal.
    B. Stator lines.
    (this multiple choice question has been scrambled)
  243. 8-41E3 What is the most common type of antenna position indicating device used in modern RADARs?
    A. Servo systems.
    B. Resolvers.
    C. Step motors.
    D. Synchro transmitters.
    B. Resolvers.
    (this multiple choice question has been scrambled)
  244. 8-41E4 Which of the following statements about antenna resolvers is correct?
    A. Most resolvers contain a rotor winding and a delta stator winding.
    B. The basic resolver contains a rotor winding and two stator windings that are 90 degrees apart.
    C. Resolvers consist of a two rotor windings and two stator windings that are 90 degrees apart.
    D. Resolvers consist of a "Y" connected rotor winding and a delta connected stator winding.
    B. The basic resolver contains a rotor winding and two stator windings that are 90 degrees apart.
    (this multiple choice question has been scrambled)
  245. 8-41E5 An antenna synchro transmitter is composed of the following:
    A. Three rotor and two stator windings.
    B. A single rotor and 3 stator windings.
    C. Three rotor and three stator windings.
    D. Two rotor and three stator windings.
    D. Two rotor and three stator windings.
    (this multiple choice question has been scrambled)
  246. 8-41E6 RADAR antenna direction must be sent to the display in all ARPAs or RADAR systems. How is this accomplished?
    A. 3-phase synchros.
    B. 2-phase resolvers.
    C. Optical encoders.
    D. Any of the above.
    D. Any of the above.
  247. 8-42E1 Waveguides can be constructed from:
    A. Brass.
    B. Aluminum.
    C. Copper.
    D. All of the above.
    D. All of the above.
  248. 8-42E2 A microwave transmission line constructed of a center conductor suspended between parallel conductive ground planes is called:
    A. Stripline.
    B. Waveguide.
    C. Coax.
    D. Microstrip.
    A. Stripline.
    (this multiple choice question has been scrambled)
  249. 8-42E3 Waveguide theory is based upon:
    A. The movement of an electromagnetic field.
    B. Current flow through conductive wires.
    C. Resonant charging.
    D. Inductance.
    A. The movement of an electromagnetic field.
    (this multiple choice question has been scrambled)
  250. 8-42E4 A waveguide is used at RADAR microwave frequencies because:
    A. It is more rugged than other feedline types.
    B. It is less expensive than other feedline types.
    C. It has lower transmission losses than other feedline types.
    D. It is easier to install than other feedline types.
    C. It has lower transmission losses than other feedline types.
    (this multiple choice question has been scrambled)
  251. 8-42E5 Waveguide theory is based on the principals of:
    A. Skin effect and use of ¼ wave stubs.
    B. High standing waves.
    C. Ohm’s Law.
    D. None of the above.
    A. Skin effect and use of ¼ wave stubs.
    (this multiple choice question has been scrambled)
  252. 8-42E6 How is the signal removed from a waveguide or magnetron?
    A. With a coaxial connector.
    B. With a waveguide flange joint.
    C. With a thin wire called a T-hook.
    D. With a thin wire called a J-Hook.
    D. With a thin wire called a J-Hook.
    (this multiple choice question has been scrambled)
  253. 8-43E1 A rotary joint is used to:
    A. Connect a stationary waveguide to the antenna array.
    B. Act as a switch between two waveguide runs.
    C. Couple two waveguides together at right angles.
    D. Maintain pressurization at the end of the waveguide.
    A. Connect a stationary waveguide to the antenna array.
    (this multiple choice question has been scrambled)
  254. 8-43E2 Resistive losses in a waveguide are very small because:
    A. The heat remains in the waveguide and cannot dissipate.
    B. The waveguide does not require a ground connection.
    C. The inner surface of the waveguide is small.
    D. The inner surface of the waveguide is large.
    D. The inner surface of the waveguide is large.
    (this multiple choice question has been scrambled)
  255. 8-43E3 A right-angle bend in an X-band waveguide must have a radius greater than:
    A. Two inches.
    B. Six inches.
    C. Three inches.
    D. One inch.
    A. Two inches.
    (this multiple choice question has been scrambled)
  256. 8-43E4 To insert RF energy into or extract RF energy from a waveguide, which of the following would not be used?
    A. Coupling capacitance.
    B. Voltage probe.
    C. Aperture window.
    D. Current loop.
    A. Coupling capacitance.
    (this multiple choice question has been scrambled)
  257. 8-43E5 The following is true concerning waveguides:
    A. The magnetic field is strongest at the edges of the waveguide.
    B. Conduction is accomplished by the polarization of electromagnetic and electrostatic fields.
    C. Ancillary deflection is employed.
    D. The magnetic field is strongest at the center of the waveguide.
    A. The magnetic field is strongest at the edges of the waveguide.
    (this multiple choice question has been scrambled)
  258. 8-43E6 At microwave frequencies, waveguides are used instead of conventional coaxial transmission lines because:
    A. They are lighter since they have hollow centers.
    B. They have considerably less loss.
    C. Moisture is never a problem with them.
    D. They are smaller and easier to handle.
    B. They have considerably less loss.
    (this multiple choice question has been scrambled)
  259. 8-44F1 When you examine the RADAR you notice that there is no target video in the center of the CRT. The blank spot gets smaller in diameter as you increase the range scale. What operator front panel control could be misadjusted?
    A. False Target Elimination (FTE).
    B. Anti-Clutter Rain (ACR).
    C. Sensitivity Time Control (STC).
    D. TUNE.
    C. Sensitivity Time Control (STC).
    (this multiple choice question has been scrambled)
  260. 8-44F2 Range rings on the PPI indicator are oval in shape. Which circuit would you suspect is faulty?
    A. Video amplifier circuit.
    B. Timing circuit.
    C. Sweep generation circuit.
    D. Range marker circuit.
    C. Sweep generation circuit.
    (this multiple choice question has been scrambled)
  261. 8-44F3 What would be the most likely defective area when there is no target video in the center of the CRT and the blank spot gets smaller in diameter as your range scale is increased?
    A. The local oscillator is misadjusted.
    B. The IF amplifier circuit.
    C. The TR (TRL) Cell.
    D. Video amplifier circuit.
    C. The TR (TRL) Cell.
    (this multiple choice question has been scrambled)
  262. 8-44F4 While the vessel is docked the presentation of the pier is distorted near the center of the PPI with the pier appearing to bend in a concave fashion. This is a primary indication of what?
    A. The waveguide compensation delay line needs adjusting.
    B. The deflection coils need adjusting.
    C. The centering magnets at the CRT neck need adjusting.
    D. The CRT filaments are weakening.
    A. The waveguide compensation delay line needs adjusting.
    (this multiple choice question has been scrambled)
  263. 8-44F5 In a RADAR using digital video processing, a bright, wide ring appears at a fixed distance from the center of the display on all digital ranges. The transmitter is operating normally. What receiver circuit would you suspect is causing the problem?
    A. EBL circuit.
    B. Video storage RAM or shift register.
    C. Range ring generator.
    D. VRM circuit.
    B. Video storage RAM or shift register.
    (this multiple choice question has been scrambled)
  264. 8-44F6 The raster scan RADAR display has missing video in a rectangular block on the screen. Where is the most likely problem area?
    A. Power supply.
    B. Horizontal sweep circuit.
    C. Vertical blanking pulse.
    D. Memory area failure.
    D. Memory area failure.
    (this multiple choice question has been scrambled)

  265. 8-45F1 A circuit card in a RADAR system has just been replaced with a spare card. You notice the voltage level at point E in Fig. 8F12 is negative 4.75 volts when the inputs are all at 5 volts. The problem is:
    A. The 100 K resistor has been mistakenly replaced with a 50 K resistor.
    B. The op amp is at the rail voltage.
    C. The 50 K resistor has been mistakenly replaced with a 25 K resistor.
    D. The 25 K resistor is open.
    C. The 50 K resistor has been mistakenly replaced with a 25 K resistor.
    (this multiple choice question has been scrambled)
  266. 8-45F2 A defective crystal in the AFC section will cause:
    A. Spiking on the PPI.
    B. No serious problems.
    C. Bright flashing pie sections on the PPI.
    D. Vertical spikes that constantly move across the screen.
    C. Bright flashing pie sections on the PPI.
    (this multiple choice question has been scrambled)
  267. 8-45F3 The RADAR display has sectors of solid video (spoking). What would be the first thing to check?
    A. Constant velocity of antenna rotation.
    B. Frequency of raster scan.
    C. Antenna information circuits failure.
    D. For interference from nearby ships.
    D. For interference from nearby ships.
    (this multiple choice question has been scrambled)

  268. 8-45F4 In the circuit contained in Fig. 8F12, there are 5 volts present at points B and C, and there are zero volts present at points A and D. What is the voltage at point E?
    A. -1.5 Volts.
    B. 3.75 Volts.
    C. 23.75 Volts.
    D. 4.5 Volts.
    A. -1.5 Volts.
    (this multiple choice question has been scrambled)
  269. 8-45F5 If the TR tube malfunctions:
    A. The receiver might be damaged.
    B. The klystron might be damaged.
    C. Magnetron current will increase.
    D. The transmitter might be damaged.
    A. The receiver might be damaged.
    (this multiple choice question has been scrambled)
  270. 8-45F6 The indicated distance from your own vessel to a lighthouse is found to be in error. What circuit would you suspect?
    A. Video amplifier.
    B. STC circuit.
    C. FTC circuit.
    D. Range ring oscillator.
    D. Range ring oscillator.
    (this multiple choice question has been scrambled)
  271. 8-46F1 Silicon crystals are used in RADAR mixer and detector stages. Using an ohmmeter, how might a crystal be checked to determine if it is functional?
    A. Its resistance cannot be checked with a dc ohmmeter because the crystal acts as a rectifier.
    B. Its resistance should be the same in both directions.
    C. Its resistance should be low in one direction and high in the opposite direction.
    D. It would be more appropriate to use a VTVM and measure the voltage drop across the crystal.
    C. Its resistance should be low in one direction and high in the opposite direction.
    (this multiple choice question has been scrambled)
  272. 8-46F2 In a RADAR unit, if the crystal mixer becomes defective, replace the:
    A. The crystal and the ATR tube.
    B. The crystal and the TR tube.
    C. The crystal and the klystron.
    D. Crystal only.
    B. The crystal and the TR tube.
    (this multiple choice question has been scrambled)
  273. 8-46F3 An increase in magnetron current that coincides with a decrease in power output is an indication of what?
    A. The external magnet weakening.
    B. The pulse length decreasing.
    C. A high SWR.
    D. A high magnetron heater voltage.
    A. The external magnet weakening.
    (this multiple choice question has been scrambled)
  274. 8-46F4 It is reported that the RADAR is not receiving small targets. The most likely causes are:
    A. Fuse blown, IF amp, or video processor.
    B. Crystals, local oscillator tuning, or power supply.
    C. Magnetron, IF amplifier, or receiver tuning.
    D. PFN, crystals, or processor memory.
    C. Magnetron, IF amplifier, or receiver tuning.
    (this multiple choice question has been scrambled)
  275. 8-46F5 A high magnetron current indicates a/an:
    A. Defective external magnetic field.
    B. High standing wave ratio (SWR).
    C. Increase in duty cycle.
    D. Defective AFC crystal.
    A. Defective external magnetic field.
    (this multiple choice question has been scrambled)
  276. 8-46F6 Low or no mixer current could be caused by:
    A. Local oscillator frequency misadjustment.
    B. TR cell failure.
    C. Mixer diode degradation.
    D. All of the above.
    D. All of the above.
  277. 8-47F1 If the magnetron is allowed to operate without the magnetic field in place:
    A. Nothing serious will happen.
    B. Its frequency will change slightly.
    C. Its output will be somewhat distorted.
    D. It will quickly destroy itself from excessive current flow.
    D. It will quickly destroy itself from excessive current flow.
    (this multiple choice question has been scrambled)
  278. 8-47F2 Targets displayed on the RADAR display are not on the same bearing as their visual bearing. What should you first suspect?
    A. One phase of the yoke assembly is open.
    B. A sweep length misadjustment.
    C. A bad reed relay in the antenna pedestal.
    D. Incorrect antenna position information.
    D. Incorrect antenna position information.
    (this multiple choice question has been scrambled)
  279. 8-47F3 Loss of distant targets during and immediately after wet weather indicates:
    A. A leak in waveguide or rotary joint.
    B. High humidity in the transmitter causing power supply loading.
    C. Dirt or soot on the rotary joint.
    D. High atmospheric absorption.
    A. A leak in waveguide or rotary joint.
    (this multiple choice question has been scrambled)
  280. 8-47F4 In a marine RADAR set, a high VSWR is indicated at the magnetron output. The waveguide and rotary joint appear to be functioning properly. What component may be malfunctioning?
    A. The waveform generator
    B. The magnetron
    C. The STC circuit
    D. The waveguide array termination
    D. The waveguide array termination
    (this multiple choice question has been scrambled)
  281. 8-47F5 On a vessel with two RADARs, one has a different range indication on a specific target than the other. How would you determine which RADAR is incorrect?
    A. Check the sweep and timing circuits of both indicators for correct readings.
    B. Triangulate target using the GPS and visual bearings.
    C. Check antenna parallax.
    D. Use the average of the two indications and adjust both for that amount.
    A. Check the sweep and timing circuits of both indicators for correct readings.
    (this multiple choice question has been scrambled)
  282. 8-47F6 An increase in the deflection on the magnetron current meter could likely be caused by:
    A. A lower duty cycle, as from 0.0003 to 0.0002.
    B. Too high a B1 level on the magnetron.
    C. Insufficient pulse amplitude from the modulator.
    D. A decrease of the magnetic field strength.
    D. A decrease of the magnetic field strength.
    (this multiple choice question has been scrambled)
  283. 8-48F1 A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect?
    A. Decrease in performance, especially for weak targets.
    B. Scatter and absorption of RADAR waves.
    C. Slightly out of focus PPI scope.
    D. No noticeable effect.
    A. Decrease in performance, especially for weak targets.
    (this multiple choice question has been scrambled)
  284. 8-48F2 The echo box is used for:
    A. Testing and tuning of the RADAR unit by providing artificial targets.
    B. Detection of the echo pulses.
    C. Testing the wavelength of the incoming echo signal.
    D. Amplification of the echo signal.
    A. Testing and tuning of the RADAR unit by providing artificial targets.
    (this multiple choice question has been scrambled)
  285. 8-48F3 What should be done to the interior surface of a waveguide in order to minimize signal loss?
    A. Fill it with a high-grade electrical oil.
    B. Paint it with nonconductive paint to prevent rust.
    C. Fill it with nitrogen gas.
    D. Keep it as clean as possible.
    D. Keep it as clean as possible.
    (this multiple choice question has been scrambled)
  286. 8-48F4 Which of the following is the most useful instrument for RADAR servicing?
    A. R. F. Wattmeter.
    B. Frequency Counter.
    C. Oscilloscope.
    D. Audio generator.
    C. Oscilloscope.
    (this multiple choice question has been scrambled)
  287. 8-48F5 A non-magnetic screwdriver should always be used when replacing what component?
    A. TR tube.
    B. Mixer.
    C. Magnetron.
    D. Video amplifier.
    C. Magnetron.
    (this multiple choice question has been scrambled)
  288. 8-48F6 What kind of display would indicate water in the waveguide?
    A. Loss of range rings.
    B. Wider than normal targets.
    C. Large circular rings near the center.
    D. Spoking.
    C. Large circular rings near the center.
    (this multiple choice question has been scrambled)
  289. 8-49F1 Why is coaxial cable often used for S-band installations instead of a waveguide?
    A. S-band waveguide flanges show too much leakage and are unsafe for use near personnel.
    B. A waveguide will not support the power density required for modern S-band RADAR transmitters.
    C. Dimensions for S-band waveguide do not permit a rugged enough installation for use by ships at sea.
    D. Losses can be kept reasonable at S-band frequencies and the installation cost is lower.
    D. Losses can be kept reasonable at S-band frequencies and the installation cost is lower.
    (this multiple choice question has been scrambled)
  290. 8-49F2 RADAR interference to a communications receiver is eliminated by:
    A. Using a link coupling.
    B. Not operating other devices when RADAR is in use.
    C. Using a high pass filter on the power line.
    D. Properly grounding, bonding, and shielding all units.
    D. Properly grounding, bonding, and shielding all units.
    (this multiple choice question has been scrambled)
  291. 8-49F3 Why should long horizontal runs of waveguide be avoided?
    A. They must be insulated to prevent electric shock.
    B. To prevent accumulation of condensation.
    C. To prevent damage from shipboard personnel.
    D. To minimize reception of horizontally polarized returns.
    B. To prevent accumulation of condensation.
    (this multiple choice question has been scrambled)
  292. 8-49F4 Long horizontal sections of waveguides are not desirable because:
    A. Excessive standing waves can occur.
    B. The waveguide can sag, causing loss of signal.
    C. Moisture can accumulate in the waveguide.
    D. The polarization of the signal might shift.
    C. Moisture can accumulate in the waveguide.
    (this multiple choice question has been scrambled)
  293. 8-49F5 In a RADAR system, waveguides should be installed:
    A. Slightly bent for maximum gain.
    B. At 90 degree angles to improve resonance.
    C. As straight as possible to reduce distortion.
    D. As long as possible for system flexibility.
    C. As straight as possible to reduce distortion.
    (this multiple choice question has been scrambled)
  294. 8-49F6 What is the most important factor to consider in locating the antenna?
    A. Allow the shortest cable/waveguide run.
    B. Maximum height for best long range operation.
    C. Easy access for maintenance.
    D. The antenna is in a location that is not shadowed by other structures.
    D. The antenna is in a location that is not shadowed by other structures.
    (this multiple choice question has been scrambled)
  295. 8-50F1 Choose the most correct statement with respect to component damage from electrostatic discharge:
    A. ESD damage may cause immediate circuit failures, but may also cause failures much later at times when the RADAR set is critically needed.
    B. ESD damage occurs primarily in active components which are easily identified and replaced.
    C. ESD damage occurs primarily in passive components which are easily identified and replaced.
    D. The technician will feel a small static shock and recognize that ESD damage has occurred to the circuit.
    A. ESD damage may cause immediate circuit failures, but may also cause failures much later at times when the RADAR set is critically needed.
    (this multiple choice question has been scrambled)
  296. 8-50F2 Before testing a RADAR transmitter, it would be a good idea to:
    A. Make sure no one is on the deck.
    B. Make sure the magnetron’s magnetic field is far away from the magnetron.
    C. Make sure the Coast Guard has been notified.
    D. Make sure there are no explosives or flammable cargo being loaded.
    D. Make sure there are no explosives or flammable cargo being loaded.
    (this multiple choice question has been scrambled)
  297. 8-50F3 While making repairs or adjustments to RADAR units:
    A. Reduce the magnetron voltage.
    B. Maintain the filament voltage.
    C. Wear fire-retardant clothing.
    D. Discharge all high-voltage capacitors to ground.
    D. Discharge all high-voltage capacitors to ground.
    (this multiple choice question has been scrambled)
  298. 8-50F4 While removing a CRT from its operating casing, it is a good idea to:
    A. Discharge the first anode.
    B. Set it down on a hard surface.
    C. Wear gloves and goggles.
    D. Test the second anode with your fingertip.
    C. Wear gloves and goggles.
    (this multiple choice question has been scrambled)
  299. 8-50F5 If a CRT is dropped:
    A. The phosphor might break loose.
    B. It might go out of calibration.
    C. It might implode, causing damage to workers and equipment.
    D. Most likely nothing will happen because they are built with durability in mind.
    C. It might implode, causing damage to workers and equipment.
    (this multiple choice question has been scrambled)
  300. 8-50F6 Prior to removing, servicing or making measurements on any solid state circuit boards from the RADAR set, the operator should ensure that:
    A. The proper work surfaces and ESD grounding straps are in place to prevent damage to the boards from electrostatic discharge.
    B. Only non-conductive tools and devices are used.
    C. The magnetic field is present to prevent over-current damage or overheating from occurring in the magnetron.
    D. The waveguide is detached from the antenna to prevent radiation.
    A. The proper work surfaces and ESD grounding straps are in place to prevent damage to the boards from electrostatic discharge.
    (this multiple choice question has been scrambled)

What would you like to do?

Home > Flashcards > Print Preview