Lighting Flashcards
For what specified period of time can portable flood lanterns be operated before the batteries must be recharged?
3 hours
The portable flood lantern has what total number of viewing windows?
Four
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?
The 117V emergency lighting system
Relay-operated lanterns are required to be installed in all EXCEPT what spaces?
Freezer boxes
The relay operated lantern should be installed in what position?
With the relay upright
The portable hand-held sealed-bean lamp is rated at what voltage?
5V
The portable hand held battle lantern contains what total number of batteries
2
What device holds together a back shell housing and shutter of an 8in sealed beam searchlight?
A quick release clamp ring
Searchlights are classified by which of the following means?
Their light source and the size of the reflector
What is the usual location of operating keys for blinker lights?
On the signal bridge
What color are the hull contour signal lights?
Blue
The grimes light is used for which of the following ships functions
ASW operation signaling
When are navigation lights tested at sea
Everyday about 1 hr before sunset
If a ship has the upper and lower red task lights burning steadily what condition is indiecated?
Not under command
Lamp size for forward and aft anchor light
50W one filament
Lamp size for man overboard light
15W one filament
Lamp size for white stern lights
50W one filament
Lampsize for port and STBD side lights?
100W 2 filament
Lighting fixtures are designated according to which of the following design features
Type of enclosure
Low pressure sodium lamps should be stored in which of the following ways
Original wrapper
Horizontally
In spaces with sprinkler systems
You should not allow a low-pressure sodium lamps internals to come in contact with air for what reason
Moisture in the air may combine with the sodium in the lamp to produce heat and hydrogen
The color of the light produced by a glow lamp is determined by the
Inert gas in the lamp
You can tell if a fluorescent lamp is defective by which indication?
Blackened ends
What means should you use to minimize the stroboscopic effect of fluorescent lamps that are operating on the three-phase ac circuits?
Operate the lamps in different circuits on different phases
You have closed the circuit switch to a fluorescent lamp, when does the current start to flow between the lamps electrodes?
Immediately
In what way do fluorescent lamps produce light?
Invisible short wave radiation is produced by the discharge through the mercury vapor
Which of the following is a type of bulb finish available through the navy supply system?
Inside frosted
Silver bowl
Clear
Lamps rated at (a) what apx. Power are of the vacuum type because inert gas would have(b) hat effect on there luminous output?
50
Decrease
What type of lighting fixtures are provided for illuminating crane and hoist areas?
Permanently installed flood lights
When door switches are connected in series or in parallel, in what location are lock-in devices installed?
On the outer door only in both series and parallel door switch circuits
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?
The possibility of exposing light from hatches on deck above the compartment
What material should you use to clean the reflector of a searchlight?
Standard navy brightwork polish
The mercury- xenon arc lamp starting current is landed by what component
The five parallel connected resistors
When the mercury-xenon arc searchlight is turned on what amount of voltage is supplied to the spark gap?
50,000 V
The safety switch of the 12in mercury- xenon searchlight has what total number of contacts
3
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
Mercury
Which of the following is the primary use of the 12in incandescent searchlight
Signaling
What is the purpose of station marking lights
To identify the stores that are to be sent to a replenishment station
You are disposing if a low-pressure sodium lamp I’ve the side of the ship which of the following PPE must be worn
Eye protection, protective clothing, a face shield
You should use a few drops of ammonia in the rinse water when cleaning light fixtures for what reason
To remove the soap film
What undesirable effect results when fluorescent lamps are operated on AC circuits
A flicker that may cause a stroboscopic effect on rotating machinery
What is the purpose of the phosphor coating in fluorescent lamps?
To absorb the invisible short-wave radiant energy produced by the lamp and repeat it over a band of wavelengths visible to the eye
The number and type of regular permanent lighting fixtures installed in a compartment for general illumination is determined by what factors
Light, intensity
The Low pressure sodium lamp requires what amount of time to reach full brilliance
7-15min
You are looking at a lamp symbol and see a black dot inside the symbol. What does this symbol tell you about the lamp?
Gas filled
The starting gas used in low-pressure sodium lamps includes which of the following gases?
Argon
Neon
Xenon
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 glow lamp
When you operate a lamp at a higher than rated voltage what is the effect on the lamp life
Decrease
What type of base issued for incandescent lamps rated above 300W
Mogul
Medium base lamps are commonly used for what type of illumination
For general lighting on lamps rated at 300 watts or less
In incandescent lamps above 50W the inert gas allows the lamp to operate in which of the following ways?
Higher temp and efficiency
Why do you connect lighting transformer banks in a delta delta connection
If one of the transformers is damaged or fails the remaining two transformers will carry about 58% of the initial load
If a glow lamp is operated on alternating current, when, if ever, is light produced
During a portion of each half cycle
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
130V
A vital lighting load receives its power from what total number of sources
Two
What color light is produced by low pressure sodium lamps
Monochromatic yellow
Lamp size of the mast head light
50W 2 filament
What type of mechanism if any is used to dim the light output of a low-pressure sodium lamp?
None the light can not be dimmed
