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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
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Sending and control
Sending and receiving
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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
To help the highline winch operator keep the highline tight during UNREP operations
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What principle permits the ultrasonic cleaner to operate with very little loss of strength?
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The frequency of the sound waves
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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
The relative incompressibility of all liquids
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By what means are shaft hp readings displayed in remote areas of the ship?
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Torque
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Repeaters only
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Remote displays only
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Repeaters and remote displays
Repeaters and remote displays
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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
Enables the generator to handle heavy loads at slow speeds with large battery currents
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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 steering motor and contacts of the steer relay coil (S)
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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
(a) 6-inch (b) 50 feet/minute
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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?
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250 %
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200 %
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150 %
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225 %
150 %
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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
A king post, a receiving head, an elevator, a carriage return unit, and a remote control console
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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
(a) 35 (b) 35
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In a forklift, thermal switches serve to protect the drive and steer motor circuits by opening if what minimum motor frame temperature is reached?
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225°F
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245°F
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250°F
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230°F
225°F
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Where is the ship’s control console located?
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The main engineering space
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The auxiliary control room
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The pilothouse
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The after steering room
• The after steering room
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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
To measure the torque on the propulsion shaft
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What safety feature is incorporated into a precipitator to prevent electrical shock to the operator?
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The surge limiting resistor
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The access cover safety switch
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The secondary is grounded
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The primary is fused
The access cover safety switch
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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
Each of the above
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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
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The static logic panel
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The cam targets
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The sensing heads
The static logic panel
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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
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The static logic panel
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The cam targets
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The sensing heads
The static logic panel
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What elevator component slows the elevator once it reaches the desired level?
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The reduction gear coupling disengages
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The limit switches insert resistance in the motor circuit
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A cam-operated limit switch switches the motor to a lower speed just before the desired level
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The photo sensors engage the brake
A cam-operated limit switch switches the motor to a lower speed just before the desired level
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In electrohydraulic elevators, speed changes are accomplished by what means?
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Altering the hydraulic oil pressure to the pump
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Using a variable resistor in the control circuit
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Varying the stroke of the hydraulic pump
•
Altering the reduction gear coupling ratio
Varying the stroke of the hydraulic pump
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What advantage, if any, is gained by using a dc motor as the pilot motor?
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The dc pilot motor operation is economical
•
The dc pilot motor is simple to operate and requires little maintenance
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The dc pilot motor makes an infinite number of platform speeds available, which range from 3 to 90 feet per minute
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None
The dc pilot motor makes an infinite number of platform speeds available, which range from 3 to 90 feet per minute
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What is the purpose of the controlled torque coupling?
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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
•
To control the speed of the windlass when dropping anchor
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To ensure constant torque on the gypsy head
To prevent excessive stresses when the anchor is being housed
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What principle is the basis for the operation of the vent fog precipitator?
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The inversion square law
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Kirchoff’s law
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Ohm’s law
•
Electrostatic precipitation
Electrostatic precipitation
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The magnetic brakes of the electric anchor windlass provide what safety feature?
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Remote operation of the brake
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A positive engagement/disengagement of the reduction gears
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Prevent overspeed
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Hold the load if power fails
A positive engagement/disengagement of the reduction gears
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If an elevator platform overtravels in the down direction, which of the following devices helps to prevent damage to the platform and the hull?
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Spring bumpers
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Electric brakes
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Safety clamps
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All of the above
Spring bumpers
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Which of the following means can be used to control the operation of the steering gear?
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Hand electric
•
Autopilot
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Emergency control
•
Each of the above
Each of the above
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