Electrical Installations (Ch.2)⛔️

Question 1

Which of the following are classifications of cable types?

Answer 1

Special purpose
No flexing service
Repeated flexing service

Question 2

What is the purpose of aluminum or steel covering of armored cable?

Answer 2

To give physical protection to the cable sheath during installation.

Question 3

Which of the following is a purpose for using nonflexing cable?

Answer 3

To use with permanent installations

Question 4

Flexing service cable designed for use aboard ship is commonly referred to as being portable because

Answer 4

It is principally used as leads to portable electric equipment

Question 5

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

Answer 5

The number of conductors in the cable

Question 6

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

Answer 6

Heat and oil resistant, flexible

Question 7

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 7?

Answer 7

Either 1 or 2, depending on the type of cable

Question 8

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

Answer 8

20

Question 9

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

Answer 9

Two conductors

Approximate cross-sectional area of a single conductor expressed in thousands of circular mills

Question 10

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?

Answer 10

Circuit integrity

Question 11

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

Answer 11

All of the above

Question 12

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

Answer 12

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

Question 13

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

Answer 13

To simplify damage control efforts

Question 14

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

Answer 14

100

Question 15

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

Answer 15

EL

Question 16

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

Answer 16

On the innermost portion of the cable

Question 17

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

Answer 17

ElMB

Question 18

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

Answer 18

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

Question 19

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

Answer 19

Megger

Question 20

Neutral polarity in a conductor is identified by what color?

Answer 20

White

Question 21

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

Answer 21

Source, voltage, service

Question 22

A cable marked as (1-129-2)-24-C(2) indicates that the circuit is supplying what maxima voltage?

Answer 22

24V

Question 23

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

Answer 23

450V

Ships service

Question 24

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

Answer 24

Lace them together

Question 25

What is the primary purpose of cable maintenance?

Answer 25

To prevent insulation resistance

Question 26

What was the driving force for developing the low smoke family of cables?

Answer 26

The Navy needed a new cable that would give off less toxic fumes and smoke during a fire