單項選擇題The breaking-up of fuel as it enters a diesel engine cylinder is known as（）

A.airification
B.vaporization
C.atomization
D.gasification


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）

A.increase in engine speed
B.increase in cylinder turbulence
C.leaking needle valve
D.reduction in cylinder turbulence