單項選擇題A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）

A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves


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1.單項選擇題One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）

A.crankcase
B.piston
C.cylinder liner
D.crank cheek

2.單項選擇題The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to（）

A.discharge exhaust gases and smoke
B.furnish energy to the turbocharger
C.reduce engine room noise
D.all of the above

3.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

4.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

5.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