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A hydraulic motor may be driven by______.
A.an electric motor
B.a diesel engine
C.a compressor
D.oil
参考答案
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These hatches are usually driven by electric or hydraulic power.B
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These hatch covers are usually driven by electric.D
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单选题A hydraulic motor may be driven by （）.A
an electric motorB
a diesel engineC
a compressorD
oil
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单选题When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.A
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until just before they make contact with the limit switch，and then hand cranked to their final positionD
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单选题操作完后，关掉电动机。（）A
After operation, start the electric motor.B
Before operation, stop the electric motor.C
Before operation, start the electric motor.D
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reversible motor at the steering station geared to the steering pumpsC
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单选题If the electric motor driving an air compressor fails to start, the cause may be a （）.A
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control line leakD
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ground proofC
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excessive pump speedB
excessive suction headC
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gross pump misalignment
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单选题Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）A
permanent loss of pump suctionB
worn shaft sealsC
high level in the oil sumpD
low motor RPM
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mediumC
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单选题The rotor of the hydraulic motor rotates at a speed proportional to the （）.A
flow of oilB
pressure of oilC
A and BD
temperature of oil
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单选题The most common forms of main drive used on deck auxiliaries are （）.A
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synchronous electric motorC
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单选题The hand steering is a method by which the motion of the rudder is controlled with （）.A
a motor-driven steering wheelB
a pneumatic steering wheelC
a hand-driven steering wheelD
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单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
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