单项选择题
A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）
A.excessive cylinder lubrication
B.a lugging engine
C.a leaking cylinder liner
D.overloading of one cylinder
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相关考题
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单项选择题
The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A.method of supplying air
B.cooling system
C.method of igniting fuel
D.valve operating mechanism -
单项选择题
Turbulence is created in the cylinders of a diesel engine to （）
A.obtain injection lag
B.help mix fuel and air
C.increase combustion pressure
D.utilize higher injection pressures -
单项选择题
The ratio of the brake horsepower to the indicate of a diesel engine is its （）
A.thermal efficiency
B.mechanical efficiency
C.brake thermal efficiency
D.volumetric efficiency
