ELECTRICIAN`S MATE Quiz 04

What information is on the thin marker tape present on most cables and cords under the binder or jacket?



• 
Name and location of the manufacturer

• 
The year the cord or cable was made

• 
The MILSPEC number of the cord or cable

• 
All of the above

A cable has been constructed so that it provides added protection, allowing it to function for a longer period under fire conditions. What term describes this cable?



• 
Special use cable

• 
Armored cable

• 
Circuit integrity 

• 
Watertight integrity

A radio frequency (RF) cable designated as LSTTRSU-10 in the Cable Comparison Guide has what total number of conductors?



• 
80

• 
60 

• 
20

• 
40

Which of the following purposes is/are served by insulation on electric cables and equipment?



• 
Isolating current-carrying conductors and conductive structural parts of other circuits or equipment

• 
Insulating points of unequal potential from one another

• 
Both 1 and 2 above 

• 
Protecting the current-carrying conductors from interference from outside electromagnetic sources

If you see the symbol HOF on a cable designation, you know the cable is of what type?



• 
Repeated flexing service, experimental

• 
Heat and oil resistant, flexible 

• 
Heat and oil resistant, nonflexible

• 
Heat resistant, synthetic rubber, extra flexible

With the circuit in the condition shown, a ground is detected in the power circuit at point 3. What should be done to isolate the faulty section and locate the ground?



• 
Open all breakers shown and use a Megger to test each circuit individually to localize the fault

• 
Use a Megger to test the motor leads to find what phase is at fault 

• 
Operate the switchboard ground detector to find what phase is grounded

• 
Stop each piece of equipment fed from the power distribution panel until the ground disappears

The marking system for power and lighting cables is shown in what sequence?



• 
Service, source, and voltage

• 
Source, voltage, and service 

• 
Voltage, source, and service

• 
Source, service, and voltage

If you need to find a comprehensive listing of the requirements for installing cables aboard Navy ships, you should refer to what publication?



• 
3-M Manual, OPNAVINST 4790.4

• 
General Specifications for Ships of the U.S. Navy, NAVSEA S9AAO-AA-SPN-010 

• 
Electrician’s Mate, OPNAVINST 4790.4

• 
Ship’s Organization and Regulations Manual, OPNAVINST 3120.32

When selecting a replacement cable for a particular installation, you must know all EXCEPT which of the following factors?



• 
The total connected load current

• 
The allowable voltage drop

• 
The number of bends in the cable

• 
The demand factor

When determining the total connected load current for a dc power circuit, you should add what number of watts for each installed receptacle?



• 
150

• 
100

• 
50

• 
200

Neutral polarity in a conductor is identified by what color?



• 
Black

• 
Red

• 
Blue

• 
White

Which, if any, of the following is the reason for keeping cable runs as short as possible?



• 
To lower construction costs

• 
To keep attenuation to a minimum 

• 
To simplify damage control efforts

• 
None of the above

In what publication will you find the exact method to use when installing cables?



• 
Cable Comparison Guide

• 
NAVEDTRA 12164

• 
NSTM

• 
Electronics Installation and Maintenance Handbook (EIMB)

What letters would be used to designate an emergency lighting circuit on a cable supplying 115 volts ac to a circuit with a load of 120 watts?



• 
C

• 
L

• 
EP

• 
EL

A circuit marking of (4-168-1)-4P-A(1) indicates that the circuit is supplying (a) what voltages of (b) what type power?



• 
(a) 115 V (b) casualty

• 
(a) 115 V (b) ship’s service

• 
(a) 450 V (b) ship’s service 

• 
(a) 450 V (b) casualty

You are installing new cables. You should measure the bend radius at what point on the cable?



• 
On the innermost portion of the cable 

• 
On the top of the cable

• 
On the bottom of the cable

• 
On the outside of the cable away from the bend

If you want cable to present a neat appearance and to be traced easily in equipment, you should take what action?



• 
Wrap them together with tape

• 
Secure them to the side of the equipment with small lengths of wire

• 
Lace them together 

• 
Twist the wires together

A cable has been newly installed. What type of meter should you use to test the insulation resistance?



• 
A megger

• 
A wattmeter

• 
An ammeter

• 
A voltmeter

A cable listed in the Cable Comparison Guide has a 7 at the end of the cable designation. Which of the following is the meaning of the 7?



• 
The number of conductors, the number of conductor pairs, and the circular mils

• 
The number of conductor pairs and the circular mils of the conductor only

• 
Either 1 or 2 above, depending on the type of cable 

• 
It has a resistance of 7 per foot

Repeated flexing, general use-cable is categorized by what means?



• 
The voltage rating

• 
The number of conductors in the cable 

• 
The current rating

• 
The ambient temperature rating

Before choosing the size of cable to use in a circuit installation, what information is necessary for you to know?



• 
The total connected load current, the demand factor, and the allowable voltage drop 

• 
The ambient temperature, the total connected load current, and the demand factor

• 
The demand factor, the total connected load current, and the voltage of the circuit

• 
The total connected load current, the power factor, and the allowable voltage drop

What action should you take before you clamp a solder-type terminal to a conductor?



• 
Twist the strands tightly and solder them only

• 
Twist the strands tightly only

• 
Untwist and tin the strands

• 
Twist the strands tightly, solder them, and tin the terminal board

The designation of a nonflexing service cable is LSDHOF-400. What does (a) the letter D and (b) the number 400 indicate?



• 
(a) Two conductors (b) approximate cross-sectional area of a single conductor expressed in thousands of circular mills

• 
(a) Two conductors (b) number of strands per conductor

• 
(a) Degaussing (b) number of strands per conductor

• 
(a) Degaussing (b) approximate cross-sectional area of a single conductor expressed in thousands of circular mills

What is the primary purpose of cable maintenance?



• 
To preserve the insulation resistance

• 
To prevent damage to the cables

• 
To keep the wireways clean and free of dust

• 
To prevent loose connections

A cable marked as (1-120-2)-24-C(2) indicates that the circuit is supplying what maximum voltage?



• 
220 V

• 
12 V

• 
24 V

• 
120 V