單項選擇題

A lube oil filter can be used to remove most contaminants from lube oilA contaminant which will remain in the lube oil after filtering is （）.

A.acid
B.fuel oil
C.sediment
D.water

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單項選擇題

Which pump installation would require an external source of sealing water?（）

A.Main circulator pump jacket water cooling
B.Salt water service pump
C.Auxiliary condensate pump
D.Bilge pump

單項選擇題

The accumulation of air and other non-condensable gases in a refrigeration system will （）.

A.cause a loss of the liquid seal
B.create a vapor lock in the liquid receiver
C.collect in the condenser
D.cause foaming of the oil in the crankcase

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