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EM1 > Lighting > Flashcards

Lighting Flashcards

1
Q

For what specified period of time can portable flood lanterns be operated before the batteries must be recharged?

A

3 hours

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2
Q

The portable flood lantern has what total number of viewing windows?

A

Four

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3
Q

A compartment aboard the ship is furnished with electrical power from the 220V power circuit, the 117V ships service lighting system, the 117V emergency lighting system, and the 117V power circuit. What circuit should furnish power for the relay-operated hard lantern?

A

The 117V emergency lighting system

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4
Q

Relay-operated lanterns are required to be installed in all EXCEPT what spaces?

A

Freezer boxes

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5
Q

The relay operated lantern should be installed in what position?

A

With the relay upright

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6
Q

The portable hand-held sealed-bean lamp is rated at what voltage?

A

5V

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7
Q

The portable hand held battle lantern contains what total number of batteries

A

2

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8
Q

What device holds together a back shell housing and shutter of an 8in sealed beam searchlight?

A

A quick release clamp ring

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9
Q

Searchlights are classified by which of the following means?

A

Their light source and the size of the reflector

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10
Q

What is the usual location of operating keys for blinker lights?

A

On the signal bridge

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11
Q

What color are the hull contour signal lights?

A

Blue

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12
Q

The grimes light is used for which of the following ships functions

A

ASW operation signaling

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13
Q

When are navigation lights tested at sea

A

Everyday about 1 hr before sunset

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14
Q

If a ship has the upper and lower red task lights burning steadily what condition is indiecated?

A

Not under command

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15
Q

Lamp size for forward and aft anchor light

A

50W one filament

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16
Q

Lamp size for man overboard light

A

15W one filament

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17
Q

Lamp size for white stern lights

A

50W one filament

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18
Q

Lampsize for port and STBD side lights?

A

100W 2 filament

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19
Q

Lighting fixtures are designated according to which of the following design features

A

Type of enclosure

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20
Q

Low pressure sodium lamps should be stored in which of the following ways

A

Original wrapper
Horizontally
In spaces with sprinkler systems

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21
Q

You should not allow a low-pressure sodium lamps internals to come in contact with air for what reason

A

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

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22
Q

The color of the light produced by a glow lamp is determined by the

A

Inert gas in the lamp

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23
Q

You can tell if a fluorescent lamp is defective by which indication?

A

Blackened ends

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24
Q

What means should you use to minimize the stroboscopic effect of fluorescent lamps that are operating on the three-phase ac circuits?

A

Operate the lamps in different circuits on different phases

25
Q

You have closed the circuit switch to a fluorescent lamp, when does the current start to flow between the lamps electrodes?

A

Immediately

26
Q

In what way do fluorescent lamps produce light?

A

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

27
Q

Which of the following is a type of bulb finish available through the navy supply system?

A

Inside frosted
Silver bowl
Clear

28
Q

Lamps rated at (a) what apx. Power are of the vacuum type because inert gas would have(b) hat effect on there luminous output?

A

50

Decrease

29
Q

What type of lighting fixtures are provided for illuminating crane and hoist areas?

A

Permanently installed flood lights

30
Q

When door switches are connected in series or in parallel, in what location are lock-in devices installed?

A

On the outer door only in both series and parallel door switch circuits

31
Q

The use of light traps to prevent a light from being shown topside is preferred over door switches when which of the following situations exists?

A

The possibility of exposing light from hatches on deck above the compartment

32
Q

What material should you use to clean the reflector of a searchlight?

A

Standard navy brightwork polish

33
Q

The mercury- xenon arc lamp starting current is landed by what component

A

The five parallel connected resistors

34
Q

When the mercury-xenon arc searchlight is turned on what amount of voltage is supplied to the spark gap?

A

50,000 V

35
Q

The safety switch of the 12in mercury- xenon searchlight has what total number of contacts

A

3

36
Q

To increase the light intensity and range of a 12in search light a small amount of what element is added to the lamp by the manufacturer

A

Mercury

37
Q

Which of the following is the primary use of the 12in incandescent searchlight

A

Signaling

38
Q

What is the purpose of station marking lights

A

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

39
Q

You are disposing if a low-pressure sodium lamp I’ve the side of the ship which of the following PPE must be worn

A

Eye protection, protective clothing, a face shield

40
Q

You should use a few drops of ammonia in the rinse water when cleaning light fixtures for what reason

A

To remove the soap film

41
Q

What undesirable effect results when fluorescent lamps are operated on AC circuits

A

A flicker that may cause a stroboscopic effect on rotating machinery

42
Q

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

A

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

43
Q

The number and type of regular permanent lighting fixtures installed in a compartment for general illumination is determined by what factors

A

Light, intensity

44
Q

The Low pressure sodium lamp requires what amount of time to reach full brilliance

A

7-15min

45
Q

You are looking at a lamp symbol and see a black dot inside the symbol. What does this symbol tell you about the lamp?

A

Gas filled

46
Q

The starting gas used in low-pressure sodium lamps includes which of the following gases?

A

Argon
Neon
Xenon

47
Q

You need to determine whether a 120V lighting fixture is energized by ac or dc. What means should you use to make this determination?

A

A glow lamp

48
Q

When you operate a lamp at a higher than rated voltage what is the effect on the lamp life

A

Decrease

49
Q

What type of base issued for incandescent lamps rated above 300W

A

Mogul

50
Q

Medium base lamps are commonly used for what type of illumination

A

For general lighting on lamps rated at 300 watts or less

51
Q

In incandescent lamps above 50W the inert gas allows the lamp to operate in which of the following ways?

A

Higher temp and efficiency

52
Q

Why do you connect lighting transformer banks in a delta delta connection

A

If one of the transformers is damaged or fails the remaining two transformers will carry about 58% of the initial load

53
Q

If a glow lamp is operated on alternating current, when, if ever, is light produced

A

During a portion of each half cycle

54
Q

You can operate a fluorescent lamp rated at 120V at which if the following voltages without seriously effecting the operation or life of the lamp

A

130V

55
Q

A vital lighting load receives its power from what total number of sources

A

Two

56
Q

What color light is produced by low pressure sodium lamps

A

Monochromatic yellow

57
Q

Lamp size of the mast head light

A

50W 2 filament

58
Q

What type of mechanism if any is used to dim the light output of a low-pressure sodium lamp?

A

None the light can not be dimmed

EM1 (12 decks)

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