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Electrician's Mate Advancement > Electrical Auxillaries (Ch.5)✅️ > Flashcards

Electrical Auxillaries (Ch.5)✅️ Flashcards

1
Q

On a small boat, what is the adjusted specific gravity of a fully charged battery?

A

1.210 to 1.220

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2
Q

What is the corrected specific gravity reading for a battery whose electrolyte temperature is 89 degrees and has an incorrectly reading of 1.212?

A

1.215

[80 degrees above] (+1 point for every 3 degrees

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3
Q

What is the corrected speck gravity reading for a battery whose electrolyte temperature is 74 degrees and has an uncorrected reading of 1.220?

A

1.218

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4
Q

What method should you use to mix electrolyte?

A

Always pour acid into the water

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5
Q

If you want to know the rating of a lead-acid storage battery, you should normally use what hourly discharge rate?

A

10 hour rate

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6
Q

An equalizing charge on a battery is continued for 4hrs until which of the following conditions are met?

A

The specific gravity of all cells show no change

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7
Q

Which of the following battery conditions may be caused by a high charging rate?

A

Excessive gassing

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8
Q

You have spilled battery acid on your arm. What is the first step you should take?

A

Wash the area thoroughly with fresh water

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9
Q

The output of the battery charger is determined by what component(s).

A

SCRs

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10
Q

What component compensates for temperature changes?

A

Resistor R5

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11
Q

What action should you take to prevent a small boat motor from overheating?

A

Operate the starting motor for 30 second periods at 2 minute intervals

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12
Q

What is the ratio of the speed of the starting motor to that of the engine?

A

15 to 1

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13
Q

On a starting motor, what causes the pull-in coil to de-energize once the solenoid switch is closed?

A

The pull-in coil is shorter by the plunger disk closing the start contacts

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14
Q

The low pressure air compressor has what total number of modes of operation?

A

Two auto (low and high),and one manual

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15
Q

On an air compressor, what condition is indicated by the enable running light?

A

The compressor is in an operative condition

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16
Q

What compressor component operates to allow the flow of the injection water?

A

Timing relay 6TR

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17
Q

When operating in the automatic 125 setting, the compressor is set to (a) start and (b) stop at what pressure?

A

(a) 110 psig falling

(b) 125 psig rising

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18
Q

What compressor component operates to drain the dehydrator condensate pump?

A

Solenoid valve SV7

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19
Q

What component acts to delay compressor shutdown for 10minutes once a discharge pressure of 125psig is reached?

A

Selector switch 1SEL

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20
Q

Freeze storerooms and chill storerooms are maintained at what temperature?

A

33 degrees and 0 degrees

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21
Q

What is the purpose of the elapsed time meter?

A

To keep track of the time a compressor is operated

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22
Q

On a refrigeration system, timing relays provide what safety feature?

A

Secure the refrigeration after 10seconds if no oil pressure develops

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23
Q

The oil pressure safety switch is designed to secure the refrigeration compressor if the oil pressure drops to what minimum value?

A

12psi

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24
Q

What type of controller is used on the air conditioning system?

A

LVP

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25
Q

What is the purpose of the heater in the control circuit?

A

To prevent condensation from forming in the compressor motor windings

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26
Q

The suction pressure switch SP is set to (a) open and (b) close at what pressure?

A

(a) 5in.Hg

(b) 8psig

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27
Q

What voltage is used to operate the components of the control circuit?

A

110VAC

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28
Q

What is the purpose of timing relay TR?

A

It opens after a 10second time delay to de-energize the compressor if oil pressure has not caused oil pressure switch OP to close it’s contacts

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29
Q

What voltage is used to operate the wiper motor?

A

115VAC

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30
Q

What are the three major components of a window wiper?

A

Control box, drive unit, wiper arm

31
Q

What feature de-ices the window served by the wiper?

A

36watt heating element in the wiper arm

32
Q

The tank of the ultrasonic cleaner has what total number of sections?

33
Q

What principle permits the ultrasonic cleaner to operate with very little loss of strength?

A

The relative incompressibility of all liquids

34
Q

What principle is the basis for the operation of the vent dog precipitator?

A

Electrostatic precipitation

35
Q

What safety feature is incorporated into a precipitator to prevent electrical shock to the operator?

A

The access cover safety switch

36
Q

What is the purpose of the shaft torsionometer system?

A

To measure the torque on the propulsion system

37
Q

By what means are shady go readings displayed in remote areas of the ship?

A

Repeaters and remote displays

38
Q

The magnetic brakes of the electric anchor windlass provide what safety feature?

A

Hold the load if power fails

39
Q

What is the purpose of the controlled torque coupling?

A

To control the speed of the windlass when dropping anchor

40
Q

If the power fails when the anchor and chain are being lowered, the electric brake is designed to hold what percentage of the rated load?

41
Q

The capstan is designed to heave (a) what line at (b) what speed?

A

(A) 6inch

(B) 50ft/min

42
Q

What elevator component slows the elevator once it reaches the desired level?

A

A cam-operated limit switch switches the motor to a lower speed just before the desired level

43
Q

Motor overloads

A

Stops the motor to protect it from an over current condition

44
Q

Slack cable switch

A

Prevents elevator operation of the cables become loose

45
Q

In electrohydraulic elevators, speed changes are accomplished by what means?

A

Varying the stroke of the hydraulic pump

46
Q

Elevators are prevented from being operate from more than one location by the installation of what component(s).

A

Interlocked push button stations

47
Q

If an elevator platform overtravels in the down direction, which of the following devices helps to prevent damage to the platform and the hull?

A

Spring bumpers
Electric brakes
Safety clamps

48
Q

The functions performed in electric elevators by limit switches, relays and contractors are performed in electronically controlled elevators by what component(s)?

A

The static logic panel

49
Q

What advantage if any is gained by using a DC motor as the pilot motor?

A

The DC pilot motor makes an infinite number of platform speeds available, which range from 3-90ft/min

50
Q

Which of he following is he purpose of the sensing heads mounted up and down the elevator trunk?

A

Each of the above

51
Q

What are the two major units of the UNREP system?

A

Sending and receiving

52
Q

What is the purpose of the ram tensioner?

A

To help the highline winch operator keep the highline tight during UNREP operations

53
Q

Which of the following are components of the receiving unit of the receiving ship?

A

A king post, a receiving head, an elevator, a carriage return unit and a remote control console

54
Q

Which of the following are components of the steer motor power circuit in an electric forklift?

A

The steering motor and contacts of the steer relay coil(S)

55
Q

What is the advantage of using solid-state control circuitry integrated with magnetically operated devices to regulate the speed of the series driven motor in an electric forklift?

A

Enables the control circuitry to operate under higher current conditions

56
Q

In a forklift, thermal switches server to protect the drive and steer motor circuits by opening if what minimum motor frame temperature is reached?

A

225 degrees

57
Q

Where is the ship’s control console located?

A

Pilot house

58
Q

The rudders have a maximum working angle of what number degrees (a) left and (b) right from the middle ship’s position?

A

(A) 35

(B) 35

59
Q

Which of the following means can be used to control the operation of the steering gear?

A

Each of the above

60
Q

What is the most common cause of failure in any hydraulic system?

61
Q

Rudder angle display system

A

Provides rudder position information to operators

62
Q

Portable steering control unit

A

Provides the option of steering from either the port or stbd bridge wing

63
Q

Helm wheel angle indicator

A

Provides a mechanical indication of the rudder command position

64
Q

Rudder angle order system

A

Provides a nonverbal means of communicating rudder commands from the pilot house to the steering gear room

65
Q

Which of the following electric galley ranges are currently used?

A

Type A, B, C

66
Q

What is the most common type of convection oven used aboard ship?

67
Q

What is the heating range of the electric griddle?

A

200-450 degrees

68
Q

What is the most frequent trouble with electric cooking equipment in the galley?

A

Burnt contacts

69
Q

What is the normal dry weight load capacity of the washer extractor?

70
Q

What means is used to operate the brake and clutch assemblies?

A

Ship’s service compressed air

71
Q

When is the automatic injection system used?

A

During FORMULA mode

72
Q

The washer extractor should always be loaded to capacity before operating for what reason?

A

Lighter loads may fail to distribute the clothes properly

73
Q

The specific gravity of battery electrolyte is the ratio of what electrolyte components?

A

The weight of a specific volume of acid to the weight of the same volume of water

Electrician's Mate Advancement (11 decks)

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