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单选题
Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.
A
gums, acids, and varnishes
B
removed by cellulose type filters
C
neutralized by oil additives
D
not removed by absorbent filters
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the system has been overheatedC
the system has been drained and then filled with new oilD
the system has been idle for a long period of time
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单选题Overheating of a hydraulic system may be a result of （）.A
changing pump discharge pressure in response to normal load variationsB
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incorrect fluid viscosityD
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bleeding refrigerant from the condenserB
opening a drain petcock on the oil separatorC
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clean the fittings before they are disconnectedB
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考题
单选题When the steering gear is in operation, you should （）.A
check hydraulic oil levels every hourB
check the rams for overheatingC
check for excessive oil leakage from ramsD
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单选题Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）A
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High lube oil pressureC
Low lube oil temperatureD
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