NEETS 10.txt

Card Set Information

Author:
bc901
ID:
286902
Filename:
NEETS 10.txt
Updated:
2014-10-24 01:24:17
Tags:
xyz
Folders:

Description:
xyz
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user bc901 on FreezingBlue Flashcards. What would you like to do?


  1. ________ is the best conductor, its cost limits its use to special circuits.
    Silver
  2. ______ is used where a substance with high conductivity or low resistivity is needed
  3. Silver
  4. The two most commonly used conductors are _______ and ______
    copper, aluminum
  5. ______ has a higher conductivity than aluminum
    copper
  6. _______ has only about 60 percent of the conductivity of copper, its lightness makes long spans possible
  7. Aluminum
  8. When stripping insulation from a conductor with a knife, the knife should be held at approximately a ___ angle to the conductor
    60 degree
  9. Wires to be soldered to connectors should be stripped so that when the wire is placed in the barrel, there will be a gap of approximately___ inch between the end of the barrel and the end of the insulation
  10. 1/32
  11. The solder used for terminal lugs, splices, and connectors is a mixture of ____-percent tin and ____-percent lead.
    60, 40
  12. THe most common type of solder is ___ % tin and ___ % lead
    63, 37
  13. 63/37 solder has a melting point of ____F.
    361
  14. The melting point of 60/40 solder is _____ F.
    370
  15. Class __ amplifiers are biased so that variations in input signal polarities occur within the limits of CUTOFF and SATURATION.
  16. A
  17. Amplifiers designed for class ___ operation are biased so that collector current is zero (cutoff) for a portion of one alternation of the input signal.
  18. AB
  19. Amplifiers biased so that collector current is cut off during one-half of the input signal are classified
  20. class __
  21. B
  22. In class __ operation, collector current flows for less than one half cycle of the input signal
    C
  23. ______ is the faithful reproduction of a signal.
    Fidelity
  24. The ______ of an amplifier refers to the ratio of output-signal power compared to the total input power
  25. efficiency
  26. _________________ is the most frequently used configuration in practical amplifier circuits, since it provides good voltage, current, and power gain.
  27. COMMON-EMITTER CONFIGURATION (CE)
  28. __________ is mainly used for impedance matching, since it has a low input resistance and a high output resistance.
  29. COMMON-BASE CONFIGURATION (CB)
  30. The ___________ is used as a current driver for impedance matching and is particularly useful in switching circuits.
  31. COMMON-COLLECTOR CONFIGURATION (CC)
  32. The voltage at which the sudden increase in current occurs is called the ___________
    BREAKDOWN VOLTAGE
  33. The LED operating voltage is small, about ___ volts forward bias and generally about 10 milliamperes
    1.6,
  34. The life expectancy of the LED is very long, over ______ hours of operation.
    100,000
  35. Transistors are semiconductor devices with ______or more terminals.
    three
  36. A second type of field-effect transistor has been introduced in recent years that has some advantages
  37. over the JFET. This device is the ______________.
    metal oxide semiconductor field effect transistor (MOSFET).
  38. The ZENER EFFECT explains the breakdown of diodes below __ volts
    5
  39. The ________which is the time (T) in which one complete vibratory cycle of events occurs,
    PERIOD
  40. The _________which is the distance the disturbance travels during one period of vibration
  41. WAVELENGTH,
  42. The ___________ is the apparent change in frequency or pitch when a sound source moves either toward or away from the listener, or when the listener moves either toward or away from the sound source
  43. DOPPLER EFFECT
  44. Sounds capable of being heard by the human ear are called ______
    Sonics
  45. The normal hearing range extends from about _____ to ______hertz
    20, 20000
  46. The standard sonic range for the Navy is _____hertz at a upper limit and a lower limit at ___hertz
    10,000 , 15
  47. Sounds below ____ hertz are known as infrasonic (formerly referred to as subsonic) sounds
  48. 15
  49. ______ is used to describe the frequency of a sound
    PITCH
  50. The speed of sound is ____ feet per second.
    1087/1100
  51. The speed of light is ______ miles per second.
    186,000
  52. The frequencies falling between ________ and ___________are called RADIO FREQUENCIES (abbreviated rf) since they are commonly used in radio communications.
  53. 3000 hertz (3 kHz), 300,000,000,000 hertz (300 GHz)
  54. The usable radio-frequency range is roughly _______ to _______.
    10 kilohertz, 100 gigahertz
  55. The _________ has a great effect on the propagation of radio waves.
  56. The _________ allows radio waves to be propagated to great distances around the Earth
    ionosphere
  57. ____________ interference refers to the static that you often hear when listening to a radio. This interference is generated by natural phenomena, such as thunderstorms, snowstorms, cosmic sources, and the sun.
    Natural
  58. Hertz antennas are generally used for frequencies above ___ megahertz
    2
  59. Marconi antennas are used for frequencies below ___ megahertz and may be used at higher frequencies in certain applications
  60. 2
  61. The basic Hertz antenna is ____ wavelength long at the operating frequency and is insulated from ground
    1/2
  62. The basic Marconi antenna is ___ wavelength long and is either grounded at one end or connected to a network of wires called a COUNTERPOISE.
    1/4

What would you like to do?

Home > Flashcards > Print Preview