單項選擇題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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1.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

2.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

3.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

4.單項選擇題In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）

A.wide compression rings are used
B.oil rings are located above the piston
C.chromium plating is used on all piston rings
D.oil rings are located near the bottom of the piston skirt

5.單項選擇題An over-speed trip stops a diesel engine when the engine （）

A.runs out of fuel
B.has low lubricating oil pressure
C.exceeds a set maximum speed
D.has high cooling water temperature