ELECTRICIAN`S MATE Quiz 13

What arc the two major units of the UNREP system?



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Control and monitoring

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Control and receiving

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Sending and receiving 

• 
Sending and control

What is the purpose of the ram tensioner?



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To prevent the highline winches from paying out too much wire

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

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To return the empty trolley to the delivery ship

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To keep the wire rope from tangling on the UNREP winches

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



• 
The frequency of the sound waves

• 
The relative incompressibility of all liquids

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The temperature of the cleaning medium

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The size of sound waves

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



• 
Torque

• 
Repeaters only

• 
Remote displays only

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Repeaters and remote displays

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?



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Prevents damage to the control circuitry from power fluctuations

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Allows longer battery-powered operation before recharging is needed

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Enables the control circuitry to operate under higher current conditions

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Enables the generator to handle heavy loads at slow speeds with large battery currents

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



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The lift pump motor and contacts of the pump relay coil (P)

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

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The drive motor and its series field

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An electric motor, hoist and tilt cylinders, and a directional control value

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



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(a) 8-inch (b) 150 feet/minute

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(a) 6-inch (b) 150 feet/minute

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(a) 6-inch (b) 50 feet/minute

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(a) 8-inch (b) 50 feet/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?



• 
250 %

• 
200 %

• 
150 %

• 
225 %

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



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

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A king post, a receiving head, an arm rotation motor, and king post winches

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An elevator, king post winches, a chain hoist, a remote control unit, and an arms rotation motor

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A chain hoist, worm gear, arm rotation motor, and king post winches

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



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(a) 35 (b) 38

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(a) 38 (b) 38

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(a) 38 (b) 35

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(a) 35 (b) 35

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



• 
225°F 

• 
245°F

• 
250°F

• 
230°F

Where is the ship’s control console located?



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The main engineering space

• 
The auxiliary control room

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The pilothouse

• 
The after steering room

What is the purpose of the shaft torsion meter system?



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To determine the optimum screw blade angle for maximum efficiency

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To prevent the shaft from being overstressed

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To measure the torque on the propulsion shaft 

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To allow precise shaft speeds to be maintained

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



• 
The surge limiting resistor

• 
The access cover safety switch

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The secondary is grounded

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The primary is fused

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



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To slow and stop the elevator

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To prevent the elevator from overspeeding

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To prevent overtravel

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Each of the above

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



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The motor controller

• 
The static logic panel

• 
The cam targets

• 
The sensing heads

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



• 
The motor controller

• 
The static logic panel 

• 
The cam targets

• 
The sensing heads

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



• 
The reduction gear coupling disengages

• 
The limit switches insert resistance in the motor circuit

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

• 
The photo sensors engage the brake

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



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Altering the hydraulic oil pressure to the pump

• 
Using a variable resistor in the control circuit

• 
Varying the stroke of the hydraulic pump

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Altering the reduction gear coupling ratio

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



• 
The dc pilot motor operation is economical

• 
The dc pilot motor is simple to operate and requires little maintenance

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

• 
None

What is the purpose of the controlled torque coupling?



• 
To prevent excessive stresses when the anchor is being housed

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To disconnect the windlass motor from power if there is an overload

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To control the speed of the windlass when dropping anchor

• 
To ensure constant torque on the gypsy head

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



• 
The inversion square law

• 
Kirchoff’s law

• 
Ohm’s law

• 
Electrostatic precipitation

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



• 
Remote operation of the brake

• 
A positive engagement/disengagement of the reduction gears 

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Prevent overspeed

• 
Hold the load if power fails

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



• 
Spring bumpers 

• 
Electric brakes

• 
Safety clamps

• 
All of the above

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



• 
Hand electric

• 
Autopilot

• 
Emergency control

• 
Each of the above