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EM1 > Electrical Auxiliaries > Flashcards

Electrical Auxiliaries Flashcards

1
Q

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

A

Lighter loads may fail to distribute clothes properly

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2
Q

When is the automatic injection system used?

A

During formula mode

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3
Q

What means is used to operate the brake and clutch assemblies

A

Ships service compressed air

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4
Q

What is the normal day weight load capacity of the washer extractor

A

60lbs

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5
Q

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

A

Burnt contacts

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6
Q

What is the heating range of the electric griddle

A

200-450 degrees F

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7
Q

What is the most common type of convection oven used aboard ships

A

M-series

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8
Q

What galley electric ranges are used

A

Type A, 36 inches
Type B, 20inches
Type C, 30inches

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9
Q

What does the rudder angle order system do?

A

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

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10
Q

What does helm wheel angle indicator do?

A

Provides a mechanical indication of the rudder command position

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11
Q

What does the portable steering control unit do?

A

Provides the option of steering from either bridge wing

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12
Q

What does the rudder angle display system do?

A

Provides rudder position information to operators

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13
Q

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

A

Dirty oil

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14
Q

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

A

Hand electric, autopilot, emergency control

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15
Q

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

A

35 and 35

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16
Q

Where is the ships control console located

A

The pilot house

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17
Q

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

A

225 degrees F

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18
Q

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

A

Allows longer battery-powered operation before recharging is needed

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19
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 steering relay coil (s)

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20
Q

Which components are the receiving unit of the receiving ship

A

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

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21
Q

What is the purpose of the ram tensioner

A

To help the high line winch operator keep the high line tight during unrep operations

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22
Q

What are the two major units of the unrep system

A

Sending and receiving

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23
Q

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

A

To slow and stop the elevator, to prevent the elevator from over speeding, to prevent over travel

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24
Q

What advantage, if any, is gained by using a dc motor as the pilot motor

A

The dc motor makes an infinite number of platform speeds available, which range from 3 to 90ft per minute

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25
Q

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

A

The static logic panel

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26
Q

If an elevator platform over-travels in the down direction which devices help to prevent damage to the platform and the hull?

A

Spring bumpers

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27
Q

Elevators are prevented from being operated from more than one location by the installation of what components?

A

Interlocked push button stations

28
Q

In electro hydraulic elevators speed changes are accomplished by what means

A

Varying the stroke of the hydraulic pump

29
Q

Purpose of the slack cable switch

A

Prevents elevator operation if the cables become loose

30
Q

Purpose of motor overloads

A

Stops the motor to protect it from an overcurrent condition.

31
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

32
Q

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

A

A. 6 inch

B. 50ft per minute

33
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

A

150%

34
Q

What is the purpose of the controlled torque coupling

A

To prevent excessive stresses when the anchor is being housed

35
Q

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

A

Hold the load of power fails

36
Q

By what means are shaft hp readings displayed in remote areas of the ship

A

Repeaters and remote displays

37
Q

What is the purpose of the shaft torsionometer system

A

To measure the torque in the propulsion shaft

38
Q

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

A

The access cover safety switch

39
Q

What priniciple is the basis for operation of the vent fog precipitator?

A

Electrostatic precipitation

40
Q

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

A

The frequency of sound waves

41
Q

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

A

2

42
Q

What feature de-ices the window served by the wiper

A

A 36W heating element in the wiper arm

43
Q

What are the three major components of a window wiper

A

Control box, drive unit, wiper arm

44
Q

What voltage is used to operate the wiper motor?

A

115 VAC

45
Q

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

A

12 PSI

46
Q

On a refrigeration system, timing relays provide what safety feature

A

Secure the refrigeration after 10 seconds if no oil pressure develops

47
Q

What is the purpose of the elapsed time meter

A

To keep track of the time a compressor is operated

48
Q

What compressor component operates to drain the dehydrator condensate sump

A

Solenoid valve SV7

49
Q

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

A

110 psig falling

125 psig rising

50
Q

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

A

Servo valve SV1

51
Q

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

A

The compressor is in an operative condition

52
Q

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

A

2 auto (low and high) and one manual

53
Q

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

A

15 to 1

54
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

55
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

56
Q

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

A

Excessive gassing

57
Q

An equalizing charge on a Battery is continued for four hours until which of the following conditions is met

A

The specific gravity of all cells shows no Change

58
Q

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

A

10 hour rate

59
Q

What method should you use to mix electrolyte

A

Always pour acid into water

60
Q

What is the corrected specific gravity reading for a battery whose electrolyte temp is 74 degrees F and has an Un-corrected reading of 1.220?

A

1218

61
Q

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

A

1215

62
Q

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

A

1.210 to 1.220

63
Q

The specific gravity of a battery electrolyte is the ratio of what electrolyte component

A

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

64
Q

Freeze storerooms and chill storerooms are maintained at what temp respectively

A

0 degrees and 33 degrees F

65
Q

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

A

Pressure switch PSI

EM1 (12 decks)

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