单项选择题

The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）

A.reciprocating motion of exhaust valves
B.rotary motion of the camshaft
C.reciprocating motion of the piston
D.developed differential

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单项选择题

When fuel enters the crankcase of a diesel engine, it （）

A.dilutes the lube oil and reduces its viscosity
B.forms sulfuric acid in the lube oil
C.causes pitting and failure of the bearings
D.causes sludge deposits on valve stems

单项选择题

In the construction of a diesel engine, what is the purpose of end plates?（）

A.To provide accessibility to the cylinder liners
B.To add stability to the engine block
C.To add rigidity to the block and a surface for attaching other parts
D.To make a surface for the base

单项选择题

A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

A.temperature of the exhaust gases
B.energy supplied to the turbocharger
C.air pressure to the intake manifold
D.purge of exhausted gases from the cylinders