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EM1 > Electrical Installations > Flashcards

Electrical Installations Flashcards

1
Q

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

A

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

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2
Q

Which of the following are classifications of cable types

A

Special purpose
Non flexing
Repeated flexing service

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3
Q

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

A

To give physical protection to the cable sheath during installation

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4
Q

What is the purpose of using non flexing cable

A

To use with permanent installations

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5
Q

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

A

It is principally used as leads to portable electric equipment

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6
Q

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

A

The number of conductors in the cable

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7
Q

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

A

Heat and oil resistant, flexible

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8
Q

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

A

General specifications for ships of the U.S. Navy, NAVSEA S9AAO-AA-SPN-010

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9
Q

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?

A

Circuit integrity

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10
Q

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

A

Name and location of the manufacturer
The year the cord or cable was made
The MILSPEC number of the cord or cable

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11
Q

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

A

The number of bends in the cable

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12
Q

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

A

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

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13
Q

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

A

To keep attenuation to a minimum

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14
Q

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

A

EL

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15
Q

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

A

On the innermost portion of the cable

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16
Q

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

A

Electronics installation and maintenance handbook (EIMB)

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17
Q

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

A

Twist the strands tightly and solder them only

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18
Q

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

A

A megger

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19
Q

Neutral polarity in a conductor is identified by what color?

A

White

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20
Q

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

A

Source, voltage, service

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21
Q

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

A

24V

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22
Q

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

A

450v

Ships service

23
Q

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

A

Lace them together

24
Q

What is the primary purpose of cable maintenance

A

To preserve the insulation resistance

25
Q

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

A

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

Insulating points of unequal potential from one another

26
Q

Electrical insulating materials are classified according to what characteristic

A

Their temperature index

27
Q

Electrical insulating materials are classified according to what characteristic?

A

Their temperature index

28
Q

What type of insulation is impregnated cotton

A

Class A

29
Q

What class of insulation is quartz

A

Class C

30
Q

What class of insulation is paper

A

Class O

31
Q

What class of insulation is asbestos

A

Class B

32
Q

Shipboard lighting transformers in a 60-hertz circuit are constructed using what class insulation?

A

Class B

33
Q

What is the limiting temperature of a piece of equipment with class N insulation?

A

200degrees C

34
Q

You would use a monograph when taking what measurement

A

The resistance/foot of a cable

35
Q

If a cable has been energized for 6 hours, what temperature should the cable be assumed to be for purposes of heating resistance?

A

104F

36
Q

What is the size and designation for casualty power cables on ac power systems

A

LSTHOF-42

37
Q

Casualty power cable leads are color coded for identification. What are the proper colors for a,b, and c phases respectively

A

Black
White
Red

38
Q

To provide or install shore power to a ship requires which of the following equipment?

A

Shore power station and receptacle
Connecting cable
Cable plug

39
Q

The shore-power system is designed to provide enough power for all equipment normally energized while at sea

A

False

40
Q

You are connecting casualty power cables in a dark compartment. What conductor feature is identified by three separate servings of twine or o-rings

A

Phase C

41
Q

What type of cable is used to connect fixed terminals that penetrate decks and bulkheads

A

LSTSGU-75

42
Q

Shore power is supplied to the ship through the use of (a) what specific length of (b) what type of cable?

A

150ft

THOF-400

43
Q

You are testing the phase sequence of a shore connection. What is indicated by a clockwise rotation of the phase sequence indicator?

A

Correct phase sequence

44
Q

Kick pipes that penetrate wooden decks should be made from what material?

A

Aluminum

45
Q

Limit switches are installed so they are connected in what configuration with (a) the master switch and (b) the voltage supply circuit?

A

Series

Series

46
Q

What is a pilot device?

A

A small device that controls a large device

47
Q

A thermal overload relay is adjusted to trip at a predetermined value. What action can you take to vary the tripping current

A

Move the relay heater coil

48
Q

What type of protection is provided by reverse-power relays?

A

They protect the generators from damage by motoring prime movers

49
Q

When two or more dc generators are connected in parallel, what device disconnects a generator from the line if the generator starts drawing power from the line?

A

A reverse-current relay

50
Q

What is the closing sequence of the contacts in an ACB circuit breaker

A

Arcing contacts close; then the main contacts close

51
Q

The instantaneous trip setting of the AQB-A250 circuit breaker is adjusted by using what components?

A

Adjusting wheels

52
Q

Which of the following circuit breakers must be manually operated to interrupt current flow

A

Type NQB

type NLB

53
Q

Selective tripping is useful aboard ship for what reason?

A

It isolates faulty circuits without interrupting other associated circuits

54
Q

When testing a grounded receptacle, what is the max acceptable resistance from the ground connection to the ships hull

A

1.0 ohms

EM1 (12 decks)

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