单项选择题

A dirty diesel engine oil filter element can best be detected by （）.

A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter

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单项选择题

In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

A.steam stop valve
B.dry pipe
C.feedwater system
D.generating tubes

单项选择题

If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.

A.an overfilled expansion tank
B.excess chromate treatment of the jacket water
C.a clogged raw water sea suction
D.cavitation erosion of the heat exchanger tubes