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单选题
How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）
A
clean the fittings before they are disconnected
B
Place drip pans under leaky fittings
C
Seal any cracks in lines with Permatex
D
Coat all threads with graphite oil
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更多 “单选题How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）A clean the fittings before they are disconnectedB Place drip pans under leaky fittingsC Seal any cracks in lines with PermatexD Coat all threads with graphite oil” 相关考题
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单选题What type of valve is used to direct the flow of hydraulic fluid?（）A
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Direction control valveC
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energy lossesC
wide pressure variationsD
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单选题After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）A
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The filters and strainers should be checked frequentlyC
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考题
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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单选题The most common contaminate of governor hydraulic fluid is （）.A
moistureB
dirtC
acidD
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store fluid under pressureB
act as a fluid reservoirC
provide overpressure reliefD
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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
add turbine oil because it is always a good substituteC
add any oil that has the same viscosity as the hydraulic fluidD
check the winch manufacturers instruction book
考题
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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charge the accumulators to prevent system energy lossD
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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
restrict movement of hydraulic fluid in one direction, but allow free movement in the other directionC
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allow a restricted fluid flow in one direction only
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dirtB
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contaminated fluidB
pitted thrust ringsC
worn pintle bearingsD
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store fluid under pressureB
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provide overpressure reliefD
replenish fluid to a system
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fluid turbulenceC
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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
the temperature of the hydraulic fluidB
the flow rate of the hydraulic fluidC
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all of the above
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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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