單項選擇題Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）

A.residual carbon deposits
B.lube oil viscosity breakdown
C.uneven heat expansion of the rings
D.uneven heat expansion of the piston


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1.單項選擇題A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）

A.one-half engine speed
B.the same as engine speed
C.twice engine speed
D.four times engine speed

2.單項選擇題In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

A.air intake
B.a fuel outlet
C.cooling water inlets
D.exhausting combustion gas

3.單項選擇題Diesel engine piston seizure can be caused by （）

A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above

4.單項選擇題Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air

5.單項選擇題Improperly fitted piston rings in a diesel engine can cause（）

A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play