單項選擇題

The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）

A.Faulty thermostatic bypass valve
B.Eroded zinc pencils in the heat exchanger
C.Steam formation in the expansion tank
D.Excessive leakage from jacket water pump seal

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單項選擇題

Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect（）

A.overloading in all cylinders
B.a jammed three-way thermostatic valve
C.chromate PH too low
D.a high level in the surge tank

單項選擇題

Trunk-type diesel engine pistons are most effectively cooled by heat（）

A.conducted through the engine block
B.conducted to water cooled cylinder walls
C.conducted through the piston crown
D.loss to escaping exhaust gases