单项选择题
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）
A.loss of suction in the circulating pump
B.leak in the primary cooling system
C.broken raw water pump shaft
D.burned or cracked piston in one cylinder
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相关考题
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单项选择题
To minimize the formation of carbon deposits on fuel injection nozzles, you should （）
A.avoid using liquid-cooled nozzles whenever possible
B.avoid low cooling water temperatures
C.avoid prolonged overloading of the engine
D.make certain the gasket seal between the nozzle and cylinder head is tight -
单项选择题
In a simple mechanical governor, the （）
A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod -
单项选择题
If a diesel engines exhaust temperature is abnormally high, the cause could be（）
A.too light of a load
B.injection timing is too early
C.overloading of the engine
D.too low of a compression ratio
