Electrical Auxiliaries Flashcards
The washer extractor should always be loaded to capacity before operating for what reason?
Lighter loads may fail to distribute clothes properly
When is the automatic injection system used?
During formula mode
What means is used to operate the brake and clutch assemblies
Ships service compressed air
What is the normal day weight load capacity of the washer extractor
60lbs
What is the most frequent trouble with electric cooking equipment in the galley
Burnt contacts
What is the heating range of the electric griddle
200-450 degrees F
What is the most common type of convection oven used aboard ships
M-series
What galley electric ranges are used
Type A, 36 inches
Type B, 20inches
Type C, 30inches
What does the rudder angle order system do?
Provides a nonverbal means of communicating rudder commands from the pilot house to the steering gear room
What does helm wheel angle indicator do?
Provides a mechanical indication of the rudder command position
What does the portable steering control unit do?
Provides the option of steering from either bridge wing
What does the rudder angle display system do?
Provides rudder position information to operators
What is the most common cause of failure in any hydraulic system
Dirty oil
Which means can be used to control the operation of the steering gear
Hand electric, autopilot, emergency control
The rudders have a max working angle of what number of degrees (a) left and (b) right from the middle ship position
35 and 35
Where is the ships control console located
The pilot house
In a forklift, thermal switches serve to protect the drive and steer motor circuits by opening of what minimum motor frame temperature is reached?
225 degrees F
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?
Allows longer battery-powered operation before recharging is needed
Which of the following are components of the steer motor power circuit in an electric forklift
The steering motor and contacts of the steering relay coil (s)
Which components are the receiving unit of the receiving ship
A king post, receiving head, an elevator, a carriage return unit, and a remote control console
What is the purpose of the ram tensioner
To help the high line winch operator keep the high line tight during unrep operations
What are the two major units of the unrep system
Sending and receiving
Which of the following is the purpose of the sensing heads mounted up and down the elevator trunk?
To slow and stop the elevator, to prevent the elevator from over speeding, to prevent over travel
What advantage, if any, is gained by using a dc motor as the pilot motor
The dc motor makes an infinite number of platform speeds available, which range from 3 to 90ft per minute
The functions performed in electric elevators by limit switches, relays, and contractors, are performed in electronically controlled elevators by what component?
The static logic panel
If an elevator platform over-travels in the down direction which devices help to prevent damage to the platform and the hull?
Spring bumpers
Elevators are prevented from being operated from more than one location by the installation of what components?
Interlocked push button stations
In electro hydraulic elevators speed changes are accomplished by what means
Varying the stroke of the hydraulic pump
Purpose of the slack cable switch
Prevents elevator operation if the cables become loose
Purpose of motor overloads
Stops the motor to protect it from an overcurrent condition.
What elevator component slows the elevator once it reaches the desired level
A cam-operated limit switch switches the motor to a lower speed just before the desired level
The capstan is designed to heave (a) what line at (b) what speed?
A. 6 inch
B. 50ft per minute
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
150%
What is the purpose of the controlled torque coupling
To prevent excessive stresses when the anchor is being housed
The magnetic brakes of the electric anchor windlass provide what safety feature?
Hold the load of power fails
By what means are shaft hp readings displayed in remote areas of the ship
Repeaters and remote displays
What is the purpose of the shaft torsionometer system
To measure the torque in the propulsion shaft
What safety feature is incorporated into a precipitator to prevent electrical shock to the operator
The access cover safety switch
What priniciple is the basis for operation of the vent fog precipitator?
Electrostatic precipitation
What principle permits the ultrasonic cleaner to operate with very little loss of strength
The frequency of sound waves
The tank of the ultrasonic cleaner has what total number of sections
2
What feature de-ices the window served by the wiper
A 36W heating element in the wiper arm
What are the three major components of a window wiper
Control box, drive unit, wiper arm
What voltage is used to operate the wiper motor?
115 VAC
The oil pressure safety switch is designed to secure the refrigeration compressor of the oil pressure drops to what minimum value
12 PSI
On a refrigeration system, timing relays provide what safety feature
Secure the refrigeration after 10 seconds if no oil pressure develops
What is the purpose of the elapsed time meter
To keep track of the time a compressor is operated
What compressor component operates to drain the dehydrator condensate sump
Solenoid valve SV7
When operating in the automatic 125 setting, the compressor is set to (a) start and (b) stop at what pressure
110 psig falling
125 psig rising
What compressor component operates to allow the flow of the injection water
Servo valve SV1
On an air compressor, what condition is indicated by the enable running light
The compressor is in an operative condition
The low pressure air compressor has what total number of modes of operation
2 auto (low and high) and one manual
What is the ratio of the speed of the starting motor to that of the engine
15 to 1
What action should you take to prevent a small boat motor from overheating
Operate the starting motor for 30 second periods at 2 minute intervals
You have spilled battery acid on your arm what is the first step you should take
Wash the area thoroughly with fresh water
Which of the following battery conditions may be caused by a high charging rate
Excessive gassing
An equalizing charge on a Battery is continued for four hours until which of the following conditions is met
The specific gravity of all cells shows no Change
If you want to know the rating of a lead-acid storage battery, you would normally use what hourly discharge rate?
10 hour rate
What method should you use to mix electrolyte
Always pour acid into water
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?
1218
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?
1215
ON a small boat, what is the adjusted specific gravity of a fully charged battery
1.210 to 1.220
The specific gravity of a battery electrolyte is the ratio of what electrolyte component
The weight of a specific volume of acid to the weight of the same volume of water
Freeze storerooms and chill storerooms are maintained at what temp respectively
0 degrees and 33 degrees F
What component acts to delay compressor shutdown for 10 minutes once a discharge pressure Of 125 psig is reached
Pressure switch PSI
