ELECTRICIAN`S MATE Quiz 09

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david11090
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ELECTRICIAN`S MATE Quiz 09
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2013-09-01 01:44:47
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ELECTRICIAN`S MATE Quiz 09
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ELECTRICIAN`S MATE Quiz 09
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  1. You are looking at a lamp symbol and see a black dot inside the symbol. What does this symbol tell you about the lamp?



    • 
    It is vacuum sealed

    • 
    The type of electrode in the lamp

    • 
    It is gas filled 

    • 
    The type of phosphorescence used in the lamp
    It is gas filled
  2. What are the two sources of power to ABT-2?



    • 
    Ship’s service switchboard 2SA and ship service switchboard 2SB

    • 
    Emergency switchboard 2E and ship’s service switchboard 2SA 

    • 
    Emergency switchboards 2E and 1E

    • 
    Ship’s service switchboard 2E and 1E
    Emergency switchboard 2E and ship’s service switchboard 2SA
  3. You can operate a fluorescent lamp rated at 120 volts at which of the following voltages without seriously affecting the operation or life of the lamp?



    • 
    150 V

    • 
    95 V

    • 
    105 V

    • 
    130 V
    130 V
  4. Medium-base lamps are commonly used for what type of illumination?



    • 
    For detail lighting on three-way lamps

    • 
    For general lighting on lamps rated at 300 watts or less 

    • 
    For direct 1,000-watt flood lamps

    • 
    For indirect lighting on lamps rated between 300 and 500 watts
    For general lighting on lamps rated at 300 watts or less
  5. What type of base is used for incandescent lamps rated above 300 watts?



    • 
    Mogul

    • 
    Intermediate

    • 
    Candelabra

    • 
    Medium
    Mogul
  6. If a glow lamp is operated on alternating current, when, if ever, is light produced?



    • 
    During a portion of the negative half cycle

    • 
    During a portion of the positive half cycle

    • 
    During a portion of each half cycle

    • 
    Never
    During a portion of each half cycle
  7. What is the cause of the terminal voltage of an ac generator dropping?



    • 
    An increased load only

    • 
    An IR drop and increased load

    • 
    Increased dc excitation to the field

    • 
    An IR drop only
    An IR drop and increased load
  8. If you operate a lamp with what (a) respect to its rated voltage, the operation will have (b) what effect on the life of the lamp?



    • 
    (a) Higher (b) decreased 

    • 
    (a) Lower (b) decreased

    • 
    (a) Lower (b) unchanged

    • 
    (a) Higher (b) unchanged
    (a) Higher (b) decreased
  9. What means should you use to minimize the stroboscopic effect of fluorescent lamps that arc operating on three-phase ac circuits?



    • 
    Combine two or three lamps in a fixture and operate them on different phases
    • 
    Operate the lamps in different circuits on different phases

    • 
    Reduce the number of lamps in the circuit

    • 
    Increase the number of lamps in the circuit
    Combine two or three lamps in a fixture and operate them on different phases
  10. In a generator, what causes the armature reaction to be much larger than the armature resistance?



    • 
    The large resistance of the coils compared to the small inductance

    • 
    The large inductance of the coils compared to the small resistance

    • 
    The induction load on the governor

    • 
    The higher temperature of the rotor windings compared with the stator windings
    The large inductance of the coils compared to the small resistance
  11. Which of the following is a type of bulb finish available through the Navy supply system?



    • 
    Inside frosted

    • 
    Silvered bowl

    • 
    Clear

    • 
    Each of the above
    Each of the above
  12. Lamps rated at (a) what approximate power are of the vacuum type because inert gas would have (b) what effect on their luminous output?



    • 
    (a) 50 (b) increase

    • 
    (a) 50 (b) decrease

    • 
    (a) 60 (b) increase

    • 
    (a) 60 (b) decrease
    a) 50 (b) increase
  13. When you operate a lamp at a higher than rated voltage, what is the effect on the life of the lamp?



    • 
    It is decreased 

    • 
    It depends on the type of lamp

    • 
    It is increased

    • 
    It remains unchanged
    It is decreased
  14. In incandescent lamps above 50 watts, the inert gas allows the lamp to operate in which of the following ways?



    • 
    Lower efficiency and lower temperature

    • 
    Higher temperature and efficiency

    • 
    Lower temperature, which causes higher efficiency

    • 
    Higher temperature, which causes lower efficiency
    Higher temperature and efficiency
  15. What, if anything, prevents both the alternate and the normal power source breakers of the emergency switchboard from being closed at the same time?



    • 
    Vigilant watch standing

    • 
    The circuit breakers are electrically and mechanically interlocked 

    • 
    The frequency and voltage monitoring system

    • 
    Nothing
    The circuit breakers are electrically and mechanically interlocked
  16. You have closed the circuit switch to a fluorescent lamp. When does the current start to flow between the lamp’s electrodes?



    • 
    As soon as the bimetal strip is heated by the glow lamp

    • 
    Immediately

    • 
    When the glow lamp bimetal strip touches the fixed electrode

    • 
    After the starting circuit opens
    When the glow lamp bimetal strip touches the fixed electrode
  17. A vital lighting load receives its power from what total number of sources?



    • 
    Two
    • 
    Four

    • 
    Three

    • 
    One
    Two
  18. By what means is the terminal voltage of an ac generator varied?



    • 
    By adding or removing the number of active coils in the field

    • 
    By varying the resistance of the field winding

    • 
    By altering the power factor of the machine 

    • 
    By varying the dc excitation to the field winding
    By altering the power factor of the machine
  19. Which of the following is the reason for fluorescent lamps ignition?



    • 
    The voltage developed in the ballast causes the starter to open and produce an arc at the electrodes

    • 
    The voltage developed by the collapse of the ballast magnetic field when the start circuit opens causes an arc across the electrodes 

    • 
    The heat of the glow lamp causes the starter to short circuit the start circuit

    • 
    The conduction of the mercury vapor in the lamp short circuits the ballast
    The voltage developed by the collapse of the ballast magnetic field when the start circuit opens causes an arc across the electrodes
  20. You can tell if a fluorescent lamp is defective by which of the following indications?



    • 
    Worn electrodes

    • 
    It is too bright

    • 
    Blackened ends 

    • 
    It is noisy
    Blackened ends
  21. Which of the following conditions causes the efficiency of a power transformer to be less than 100%?



    • 
    The IR drop in the windings and voltage crossover from the primary to the secondary windings

    • 
    Loose connections at the primary

    • 
    The copper losses in the windings and the hysteresis and eddy current losses in the core 

    • 
    The size of the resistive load on the secondary
    The copper losses in the windings and the hysteresis and eddy current losses in the core
  22. The color of the light produced by a glow lamp is determined by the



    • 
    inert gas used in the lamp 

    • 
    type of electrode used

    • 
    voltage used to operate the lamp

    • 
    size of the limiting resistor
    inert gas used in the lamp
  23. It is preferable to connect lighting transformer banks in a delta-delta configuration for what reason?



    • 
    It’s more economical to operate them in this configuration than in a series configuration

    • 
    It allows less wiring to be used, saving weight

    • 
    If one of the transformers is damaged or fails, the remaining two transformers will carry about 58% of the initial load capacity
    • 
    If connections overheat, there is less chance of fire occurring
    If one of the transformers is damaged or fails, the remaining two transformers will carry about 58% of the initial load capacity
  24. You need to determine whether a 120-volt lighting fixture is energized by ac or dc. What means should you use to make this determination?



    • 
    A glow lamp 

    • 
    A fluorescent lamp

    • 
    A TV lamp

    • 
    An incandescent lamp
    A glow lamp
  25. In what way do fluorescent lamps produce light?



    • 
    The inductive kick of the ballast causes the electrodes at each end to glow

    • 
    Invisible, short-wave radiation is produced by the discharge through the mercury vapor

    • 
    Current causes the electrodes at each end to glow

    • 
    Heat from the vaporized mercury causes the phosphor coating to give off light
    Invisible, short-wave radiation is produced by the discharge through the mercury vapor

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