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單項選擇題

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

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單項選擇題

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

單項選擇題

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