Electrical Auxillaries (Ch.5)✅️

Question 1

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

Answer 1

1.210 to 1.220

Question 2

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

Answer 2

1.215

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

Question 3

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

Answer 3

1.218

Question 4

What method should you use to mix electrolyte?

Answer 4

Always pour acid into the water

Question 5

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

Answer 5

10 hour rate

Question 6

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

Answer 6

The specific gravity of all cells show no change

Question 7

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

Answer 7

Excessive gassing

Question 8

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

Answer 8

Wash the area thoroughly with fresh water

Question 9

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

Answer 9

SCRs

Question 10

What component compensates for temperature changes?

Answer 10

Resistor R5

Question 11

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

Answer 11

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

Question 12

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

Answer 12

15 to 1

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Two auto (low and high),and one manual

Question 15

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

Answer 15

The compressor is in an operative condition

Question 16

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

Answer 16

Timing relay 6TR

Question 17

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

Answer 17

(a) 110 psig falling

(b) 125 psig rising

Question 18

What compressor component operates to drain the dehydrator condensate pump?

Answer 18

Solenoid valve SV7

Question 19

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

Answer 19

Selector switch 1SEL

Question 20

Freeze storerooms and chill storerooms are maintained at what temperature?

Answer 20

33 degrees and 0 degrees

Question 21

What is the purpose of the elapsed time meter?

Answer 21

To keep track of the time a compressor is operated

Question 22

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

Answer 22

Secure the refrigeration after 10seconds if no oil pressure develops

Question 23

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

Answer 23

12psi

Question 24

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

Answer 24

LVP

Question 25

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

Answer 25

To prevent condensation from forming in the compressor motor windings

Question 26

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

Answer 26

(a) 5in.Hg | (b) 8psig

Question 27

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

Answer 27

110VAC

Question 28

What is the purpose of timing relay TR?

Answer 28

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

Question 29

What voltage is used to operate the wiper motor?

Answer 29

115VAC

Question 30

What are the three major components of a window wiper?

Answer 30

Control box, drive unit, wiper arm

Question 31

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

Answer 31

36watt heating element in the wiper arm

Question 32

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

Answer 32

2

Question 33

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

Answer 33

The relative incompressibility of all liquids

Question 34

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

Answer 34

Electrostatic precipitation

Question 35

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

Answer 35

The access cover safety switch

Question 36

What is the purpose of the shaft torsionometer system?

Answer 36

To measure the torque on the propulsion system

Question 37

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

Answer 37

Repeaters and remote displays

Question 38

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

Answer 38

Hold the load if power fails

Question 39

What is the purpose of the controlled torque coupling?

Answer 39

To control the speed of the windlass when dropping anchor

Question 40

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?

Answer 40

150%

Question 41

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

Answer 41

(A) 6inch | (B) 50ft/min

Question 42

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

Answer 42

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

Question 43

Motor overloads

Answer 43

Stops the motor to protect it from an over current condition

Question 44

Slack cable switch

Answer 44

Prevents elevator operation of the cables become loose

Question 45

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

Answer 45

Varying the stroke of the hydraulic pump

Question 46

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

Answer 46

Interlocked push button stations

Question 47

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

Answer 47

Spring bumpers Electric brakes Safety clamps

Question 48

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

Answer 48

The static logic panel

Question 49

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

Answer 49

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

Question 50

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

Answer 50

Each of the above

Question 51

What are the two major units of the UNREP system?

Answer 51

Sending and receiving

Question 52

What is the purpose of the ram tensioner?

Answer 52

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

Question 53

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

Answer 53

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

Question 54

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

Answer 54

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

Question 55

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?

Answer 55

Enables the control circuitry to operate under higher current conditions

Question 56

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

Answer 56

225 degrees

Question 57

Where is the ship's control console located?

Answer 57

Pilot house

Question 58

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

Answer 58

(A) 35 | (B) 35

Question 59

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

Answer 59

Each of the above

Question 60

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

Answer 60

Dirty oil

Question 61

Rudder angle display system

Answer 61

Provides rudder position information to operators

Question 62

Portable steering control unit

Answer 62

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

Question 63

Helm wheel angle indicator

Answer 63

Provides a mechanical indication of the rudder command position

Question 64

Rudder angle order system

Answer 64

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

Question 65

Which of the following electric galley ranges are currently used?

Answer 65

Type A, B, C

Question 66

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

Answer 66

M-series

Question 67

What is the heating range of the electric griddle?

Answer 67

200-450 degrees

Question 68

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

Answer 68

Burnt contacts

Question 69

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

Answer 69

60lbs

Question 70

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

Answer 70

Ship's service compressed air

Question 71

When is the automatic injection system used?

Answer 71

During FORMULA mode

Question 72

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

Answer 72

Lighter loads may fail to distribute the clothes properly

Question 73

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

Answer 73

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