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IC World > IC1 Questions > Flashcards

IC1 Questions Flashcards

0
Q

When using a multimeter to check continuity of the ground conductor from the tool case to the dummy receptacle, be sure the reading is…

A

Less than 1ohm

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1
Q

What is the max safe voltage of rubber gloves that are labeled with the color white?

A

7,500V

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2
Q

Who is responsible for understanding and observing safety standards and regulations on board the ship?

A

All individuals

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3
Q

What publication specifically contains general shipboard safety precautions?

A

OPNAVINST 5100.19E

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4
Q

What color are warning signs?

A

Red and white

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5
Q

What color are caution signs?

A

Yellow and black

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6
Q

When are danger shock hazard signs used?

A

When voltages are between 30 and 500 volts.

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7
Q

Warning plates are installed in small craft to warn personnel of what potential?

A

Explosive vapors

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8
Q

What color is a caution tag?

A

Yellow

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9
Q

What color is a danger tag?

A

Red

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10
Q

Can equipment with an out of calibration label still be used?

A

Yes, with extreme caution

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11
Q

Isolated receptacle circuits are designed to limit ground leakage currents to how many milliamperes?

A

10 milliamperes

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12
Q

Why must you short-circuit the secondary of a current transformer before you disconnect the meter?

A

To prevent an extremely high voltage build up

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13
Q

When, if ever, is it permissible to block an interlock switch on a piece of equipment?

A

When authorized by the CO for operational reasons

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14
Q

What do you use to discharge capacitors?

A

Shorting probe

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15
Q

What class of rubber gloves should be worn when dealing with 5000volts?

A

Class II

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16
Q

When installing rubber floor matting, you should ensure there are no seams within what minimum distance of an electrical hazard?

A

3 ft

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17
Q

Why should a dummy outlet be installed near a work bench?

A

To test the grounding conductors on portable power tools

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18
Q

What is an acceptable resistance reading for the ground connection between the ships hulk and metal frame of a portable electric drill?

A

1ohm or less

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19
Q

Under normal usage, the maximum length of an extension cord used with portable tools should NOT exceed how many feet?

A

25 feet

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20
Q

The current coil of a wattmeter or an ammeter must be connected in what way?

A

In series with the load

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21
Q

In signal generators and oscilloscopes, how are the effects of moisture minimized?

A

By built in heaters

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22
Q

Before being used on electronic equipment, metallic tools should be insulated by wrapping with what material?

A

Two layers of rubber tape or vinyl plastic tape, half lapped

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23
Q

If cared for properly, lead acid storage batteries should last for what max period of time?

A

4 or more years

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24
Q

The charging rate of a lead-acid storage battery being charged should be lowered under what circumstance?

A

If the temperature of the battery reaches 125 degrees

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25
Q

What is the proper procedure for mixing electrolyte?

A

Pour the acid slowly into the water

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26
Q

Dry- cell batteries should be removed when the equipment they are used with is going to remain idle for what min length of time?

A

2 weeks

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27
Q

To remove large fragments of a broken radioactive tube, what should be used?

A

Forceps

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28
Q

Why should you be extremely cautious when handling a CRT?

A

Because it’s glass envelope encloses radioactive gas

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29
Q

Before disposing of a CRT, you should break off the tip of the glass vacuum seal with what?

A

Pliers

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30
Q

What is the proper method for disposing of aerosol dispensers?

A

Put in approved waste receptacle

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31
Q

What solvents should NEVER be used for cleaning electrical equipment?

A

Inhibited methyl chloroform

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32
Q

What is the preferred grade of insulating varnish used in the navy?

A

-clear baking varnish (CB)

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33
Q

What materials should never be used to clean contacts

A

Steel wool and emery cloth/paper

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34
Q

A fire breaks out in a piece of electrical equipment, what is the first thing that should be done?

A

De-energize the piece of equipment

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35
Q

Low voltage (115v and below) circuits are NOT dangerous because they do not cause death. ( true or false)

A

False

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36
Q

The victim of electrical shock by a portable drill should be freed of contact how?

A

Unplug the drill

37
Q

What is the purpose of artificial ventilation?

A

To provide a method of air exchange

38
Q

To be effective, CPR must be started within what max length of time?

A

4 minutes

39
Q

A wound that is often complicated by crushing of the tissues is classified as what?

A

A laceration

40
Q

When direct-pressure method is used and fails to stop the bleeding what action should be taken?

A

Use the pressure point method

41
Q

What burns are for the most part NOT caused by heat?

A

Chemical

42
Q

What is the most important factor in determining the seriousness of a burn?

A

The extent of the body surface burned

43
Q

Which of the following is a characteristic symptom of a a secondary- degree burn?

A

Blistered skin

44
Q

Hazardous noise areas that produce continuous and intermittent sound levels greater than what min level?

A

84db

45
Q

A worker should wear double hearing protection when working around noise sources above what min sound level?

A

104 db

46
Q

Exposure of personnel to excessive heat, humidity, and thermal radiation while under a continued work load can result in what?

A

Heat stress
Heat stroke
Heat exhaustion

47
Q

Heat stress survey must be ordered when the temperature in a space exceeds what min level?

A

100 degrees F

48
Q

To what does the rating of a switch refer?

A

The maximum allowable voltage and current of the circuit in which the switch is to be used

49
Q

Switch contacts should be open and closed slowly to minimize arching. (True or false)

A

False

50
Q

The single- throw switch has what total number of pole?

A

Two

51
Q

What are the voltage and amp ratings of the various types of toggle switches?

A

20 volts to 600 volts

1 amp to 30 amps

52
Q

What is the normal contact arrangement of a push- button switch?

A

Either make or break type

53
Q

What does the first number in a rotary snap switch designation indicate?

A

Current rating

54
Q

For a pile switch, when operated, what terminals are connected together?

A

2 and 3

5 and 6

55
Q

A type J multiple rotary switch with five sections has what total number of stationary contacts and moveable contacts?

A

8 movable

2 stationary

56
Q

In type 3 JR switch, what total number of moveable wiper contacts are there per section?

A

One

57
Q

What is the purpose of the stop deck of a JR?

A

It enables the switch to be set to a desired number of positions

58
Q

How does the JL switch compare to the JR switch?

A

The JL switch is rated the same as the JR switch

59
Q

What kind of contacts are used in JA switches.

A

Silver to copper

60
Q

The JF switch replaces what type of switch?

A

Toggle switches in the 10/20- switch boxes for sound powered telephone applications

61
Q

What type of interiors are used in most lever- operated switches

A

JR

62
Q

What means is used to distinguish the collision alarm on a submarine?

A

A star shape

63
Q

How is a typical pressure- operated switch similar to a typical temperature- operated switch?

A
  • both are single- pole, single throw, and quick-acting switches
  • both contain a bellows or diaphragm the works against an adjustable spring
  • both contain contacts that are closed automatically by an adjustable spring when a preset value of the operating condition is reached
64
Q

How is the operating point of a cam- operated mechanical switch varied?

A

By adjusting the contact gap of the micro switch

65
Q

How many pairs of terminals are used in water switches?

A

One

66
Q

QA

A

Air- locking Indicator

67
Q

PW

A

Clutch- position indicator

68
Q

DW

A

Wrong - direction alarm

69
Q

SP

A

Shaft- position alarm

70
Q

LS

A

Submersible steering- gear alarm

71
Q

How is the liquid- level float switch changed from normally open to normally closed?

A

By turning over the magnetic core

72
Q

What is circuit FH?

A

Sprinkling alarm systems

73
Q

Which of the following troubles is caused by excessive tightening of the packing gland nut in a watertight rotary switch?

A

Improper positioning of the switch

74
Q

When servicing a pair of copper contacts (one is slightly burned, the other badly burned), which of t he following procedures should you follow?

A

Replace both contacts

75
Q

You should NOT attempt to remove the tarnish the forms on silver contacts for which of the following reasons?

A

Because the tarnish improves the operation of the contacts

76
Q

How is the coiled a relay that is designed for shunt connection wound?

A

With a large number of turns of small wire

77
Q

How are control relays classified?

A

Open
Semi- sealed
Sealed

78
Q

What causes the bimetallic strips of a thermal relay to bend when heat is applied?

A

Lag coil or slug influencing their magnetic properties

79
Q

What two windings are used in latch-in relays?

A

Trip coil and reset coil

80
Q

To close the contacts of an AC shunt relay, a voltage must be applied to what components?

A

The operating current

81
Q

What should you use to clean a relay?

A

Burnishing tool

82
Q

What type of relay has multiple sets of contacts?

A

Clapper relay

83
Q

What total number of adjustment are there on a two- coil, series-type relay?

A

Two

84
Q

What type of relays are also known as contractors?

A

Power relays

85
Q

The “cone and crater” effect that is associated with relay contacts is caused by what condition?

A

Current flowing in one direction through the relay

86
Q

When one of the contacts of a shunt relay is badly pitted, what action should you take?

A

When one of the contacts of a shunt relay is badly pitted, what action should you take?

87
Q

When the relay contact springs are bent during cleaning, what action should you take?

A

Straighten the contact with a point bender

88
Q

Solenoids are used for which of the following reasons?

A

To convert electrical energy into mechanical motion

89
Q

What is the second step in checking an improperly operating solenoid?

A

Check the energizing voltage

90
Q

What type of fuse holder will hold two fuses?

A

FHL10G

IC World (5 decks)

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