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Which piblication specifically contains general shipboard safety precautions?
OPNAVINST 5100.19E
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What color are warning signs?
Red
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What color are caution signs?
Yellow
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When are danger shock hazard signs used?
Where voltages are between 30 and 500 volts
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Warning plates are installed in small craft to warn personnel of what potential hazard?
Explosive vapors
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What color are caution tags?
yellow
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What color are danger tags?
red
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When are caution tags used?
When temporary special instructions or unusual caution must be exercised to operate equipment
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When are danger tags used?
When operation of equipment could injure personnel or damage equipment
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What type of electrical distribution systems are found on Navy ships?
Ungrounded
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Isolate receptacle circuits are designed to limit ground leakage currents to how many miliamps?
10
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Why must you short-circuit the secondary of a current transformer before you disconnect the meter?
to prevent an extremly high voltage buildup
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When, if ever, is it permissible to block open an interlock switch on a piece of equipment?
When authorized by the commanding officer for operational reasons
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What are class I rubber gloves rated for and what color is the label?
7.5k Volts - white label
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What are class II rubber gloves rated for and what color is the label?
17k Volts - yellow label
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What are class III rubber gloves rated for and what color is the label?
26.5k Volts - green label
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What are class 0 rubber gloves rated for and what color is the label?
1k Volts - red label
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When installed rubber floor matting, you should ensure there are no seams within what minimum distance of an electrical hazard?
3ft
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Why should a dummy outlet be installed near a workbench?
To test the grounding conductors on portable power tools
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What is an acceptable resistance reading for the ground connection between ship's hull and metal fram of a portable electric drill?
1 ohm or less
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The maximum length of an extension cord used with portable tools should NOT exceed what total number of feet?
25ft
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The current coil of a wattmeter or an anmeter must be connected in what way?
In seriers with the load
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In signal generators and oscilloscopes, how are the effects of moisture minimized?
by the built-in-heaters
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How should you wrap metallic tools for use on electronic equipment?
two layers of rubber or vinyl plastic tape, half-lapped
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To clean soldering irons of excessive solder, what should you use?
wipe soldering iron across a piece of canvas
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If cared for properly, lead-acid storage batteries should last what maximum period of time?
4 or more years
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The charging rate of a lead-acid storage battery being charges should be lowered under which of the following circumstances?
- If the battery begins to gas
- If the temp of the battery reaches 125F (52C)
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What is the proper procedure for mixing electrolyte?
Pour the acid slowly into the water
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Where are alkaline storage batteries used?
Bus failure alarms
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Dry-cell batteries should be removed when the equipment they are used with is going to remain idle for what minimum length of time?
2weeks
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Why should you always be extremely cautious when handling a CRT?
Because its glass envelope encloses a high vacuum and may implode under atmospheric pressure
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Before disposing of a CRT, you should break off the tip of the glass vacuum seal with what device?
Screwdriver
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What is the proper method for disposing of aerosol dispensers?
Put in an approved waste receptacle
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What should be used to clean electrical equipment?
a water-based and non-volatile solution
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What is the preferred grade of insulating varnish used in the Navy?
CB
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What material should never be used to clean contacts?
Emery cloth/paper and steel wool
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How many amps are fatal?
.1 Amp (100 mA)
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What is the purpose of artificial ventilation?
To provide a method of air exchange
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To be effective, CPR must be started within what maximum length of time after a victim has sufferred cardiac arrest?
4 minutes
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What burns are not caused by heat?
Chemical
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What is the most important factor in determining the seriousness of a burn?
The extent of the body surface burned
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Hazardous noise area are areas that produce continuous and intermittent sound levels greater than what minimum level?
84 dB(A)
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When should a worker wear double hearing protection?
104 dB(A)
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A heat stres survey must be ordered when the temperature in a space exceeds what minimum level?
100 F
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