單項選擇題The purpose of compressing the air within the cylinder of a diesel engine is to ()

A.produce the heat for ignition
B.decrease injection lag
C.increase ignition delay
D.aid in exhausting burnt gases


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1.單項選擇題A smoking exhaust from an operating diesel engine could be caused by ()

A.low sulfur content in the fuel
B.a loose injector inlet connection
C.late fuel injection
D.high injection pressure

2.單項選擇題What is commonly used to create turbulence in a diesel engine combustion system?()

A.Shape of the piston crowns
B.Increasing the compression ratios
C.Increasing the piston crowns
D.Increasing the turbocharger gear ratio

3.單項選擇題What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?()

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow plug

4.單項選擇題If a diesel engine fails to start,one of the likely causes is ()

A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure

5.單項選擇題Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening ()

A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later

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