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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 suction
B
worn shaft seals
C
high level in the oil sump
D
low motor RPM
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单选题What is the best way of stopping an over-speeding diesel engine?（）A
Disconnect the battery cables from the starting motorB
Drain the hydraulic fluid from the governor sumpC
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单选题Which of the following statements about pump operations is NOT a correct statement?（）A
In order for a fluid to be pumped, a fluid must be made to flowB
A substance must be cold in order for it to be pumpedC
The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic systemD
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考题
单选题The most common contaminate of governor hydraulic fluid is （）.A
moistureB
dirtC
acidD
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单选题A hydraulic accumulator aboard a ship is designed to（）.A
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单选题If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.A
add fluid that is the same color as the fluid in the reservoirB
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add any oil that has the same viscosity as the hydraulic fluidD
check the winch manufacturers instruction book
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单选题If a hydraulic pump is overheating, the cause may be （）.A
excessive internal leakage in the pumpB
low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
operation of the pump at 100% efficiency
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单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）A
drain the accumulators and purge with oxygenB
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单选题An orifice-check valve placed in a hydraulic system is used to（）A
regulate the fluid flow in either directionB
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单选题A hydraulic accumulator is designed to（）.A
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单选题Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.A
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考题
单选题Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.A
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单选题In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）A
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单选题Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.A
hydraulic fluid contaminationB
excessive fluid frictionC
turbulent fluid flowD
fluid pressure surges
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