ELECTRICIAN`S MATE Quiz 10

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  1. What is the purpose of the phosphor coating in fluorescent lamps?



    • 
    To produce invisible, short-wave radiation by the discharge through the mercury vapor

    • 
    To absorb the invisible short-wave radiant energy produced by the lamp and reradiate it over a band of wavelengths visible to the eye 

    • 
    To cause the electrodes at each end to glow

    • 
    To cause the heat from the vaporized mercury to make the phosphor coating give off light
    To absorb the invisible short-wave radiant energy produced by the lamp and reradiate it over a band of wavelengths visible to the eye
  2. The low-pressure sodium lamp requires what amount of time to reach full brilliancy?



    • 
    30 to 60 seconds

    • 
    7 to 15 minutes 

    • 
    1 to 5 minutes

    • 
    15 to 30 seconds
    7 to 15 minutes
  3. What device is installed to align the backshell housing of the 8-inch, scaled-beam searchlight?



    • 
    A swivel

    • 
    A yoke

    • 
    A hook and key

    • 
    A clamp ring
    A hook and key
  4. What color light is produced by low-pressure sodium lamps?



    • 
    Diffusible green

    • 
    Iridescent blue

    • 
    Magenta red

    • 
    Monochromatic yellow
    Monochromatic yellow
  5. While repairing the affected running light, you can silence the buzzer by what means?



    • 
    Place the reset switch in the horizontal position 

    • 
    Close contacts X and Y

    • 
    Close contacts Y and Z

    • 
    Place the reset switch in the vertical position
    Place the reset switch in the horizontal position
  6. You should not allow a low-pressure sodium lamp’s internals to come in contact with air for what reason?



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    The phosphor coating of the lamp will oxidize

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    Phosgene gas is produced if the element is energized in air

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    Moisture in the air may combine with the sodium in the lamp to produce heat and hydrogen 

    • 
    Ethane gas is produced by mixing the salt-laden air with-the neon gas inside the lamp
    Moisture in the air may combine with the sodium in the lamp to produce heat and hydrogen
  7. If a ship has the upper and lower red task lights burning steadily, what condition is indicated?



    • 
    Not under command

    • 
    Minesweeping

    • 
    Man overboard

    • 
    Launching aircraft
    Not under command
  8. What is the operating voltage of a transformer equipped, 8-inch, scaled-beam searchlight?



    • 
    60 V

    • 
    115 V

    • 
    28 V

    • 
    12 V
    115 V
  9. The Grimes light is used for which of the following ship’s functions?



    • 
    ASW operation signaling 

    • 
    Indicating a disabled ship

    • 
    Station marking

    • 
    Identifying stores
    ASW operation signaling
  10. Lighting fixtures are designated according to which of the following design features?



    • 
    Color

    • 
    Type of enclosure

    • 
    Size

    • 
    Illumination
    Type of enclosure
  11. In time of war, all topside light must be filtered to become red in color.



    • 
    True 

    • 
    False
    True 
  12. You are disposing of a low-pressure sodium lamp over the side of the ship. Which of the following protective equipment must you wear?



    • 
    Eye protection

    • 
    Protective clothing

    • 
    A face shield

    • 
    All of the above
    All of the above
  13. Low-pressure sodium lamps should be stored in which of the following ways?



    • 
    In their original wrapper

    • 
    Horizontally

    • 
    In spaces with sprinkler systems

    • 
    All of the above
    All of the above
  14. The starting gas used in low-pressure sodium lamps includes which of the following gases?



    • 
    Argon

    • 
    Neon

    • 
    Xenon

    • 
    All of the above
    All of the above
  15. What undesirable effect results when fluorescent lamps are operated on ac circuits?



    • 
    Excessive heat

    • 
    A flicker that may cause a stroboscopic effect on rotating machinery

    • 
    A capacitive load on the electrical distribution system

    • 
    Excessive current is drawn from the line while starting the lamps
    A flicker that may cause a stroboscopic effect on rotating machinery
  16. When the relay of the running light is deenergized because the primary filament failed, the relay functions and performs which of the following actions?



    • 
    Sounds the buzzer and moves an annunciator target to read out

    • 
    Energizes the indicator light

    • 
    Transfers power to the secondary filament of the affected light

    • 
    All of the above
    •  All of the above
  17. What device holds together the backshell housing and shutter of an 8-inch, sealed-beam searchlight?



    • 
    A quick-release clamp ring 

    • 
    The rail clamp

    • 
    A swivel-mounted yoke

    • 
    The springs
    A quick-release clamp ring
  18. You should use a few drops of ammonia in the rinse water when cleaning light fixtures for what reason?



    • 
    To kill insects that may enter the fixture

    • 
    To remove oily fingerprints

    • 
    To sterilize the fixture

    • 
    To remove the soap film
    To remove the soap film
  19. When are navigation lights tested at sea?



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    Once a month, according to PMS requirements

    • 
    Every Friday, at 0700

    • 
    Every 2 hours during the afternoon

    • 
    Every day, about 1 hour before sunset
    Every day, about 1 hour before sunset
  20. What is the usual location of operating keys for blinker lights?



    • 
    On the signal bridge
    • 
    In radio central

    • 
    On the mast

    • 
    In the pilothouse
    On the signal bridge
  21. The number and type of regular permanent lighting fixtures installed in a compartment for general illumination is determined by which of the following factors?



    • 
    Current

    • 
    Voltage

    • 
    Both 1 and 2 above

    • 
    Light intensity
    Light intensity
  22. What color are the hull contour signal lights?



    • 
    Yellow

    • 
    Red

    • 
    White

    • 
    Blue
    Blue
  23. What is the purpose of station marking lights?



    • 
    To identify the stores that are to be sent to a replenishment station

    • 
    To identify lines of departure for amphibious operations

    • 
    To help ships maintain their stations in a convoy

    • 
    To identify ships involved in ASW operations
    To identify the stores that are to be sent to a replenishment station
  24. Searchlights are classified by which of the following means?



    • 
    Their light source arid the size of the reflector 

    • 
    Their light source and their voltage

    • 
    Their shape and reflector size

    • 
    Their shape and power source
    Their light source arid the size of the reflector
  25. What type of mechanism, if any, is used to dim the light output of a low-pressure sodium lamp?



    • 
    A 0- to 1,000-ohm rheostat is placed in series with the lamp

    • 
    A 0- to 1,000-ohm rheostat is placed in parallel with the lamp

    • 
    The supply voltage to the lamp is adjusted

    • 
    None; the light cannot be dimmed
    None; the light cannot be dimmed

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ELECTRICIAN`S MATE Quiz 10
Updated:
2013-09-01 05:44:00
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ELECTRICIAN`S MATE Quiz 10
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ELECTRICIAN`S MATE Quiz 10
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