單項選擇題

When fuel is injected in a diesel engine cylinder too early, （）

A.ignition may be delayed
B.fuel economy is not affected
C.exhaust gas temperature will be unchanged
D.the exhaust will be clear

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單項選擇題

The purpose of an after-cooler is to（）

A.reduce the turbocharger operating temperature
B.increase the pressure of the inlet air
C.increase the density of the inter air
D.reduce the blower operating temperature

單項選擇題

Early fuel injection timing is indicated by the cylinder pressure being（）

A.above normal with a below normal exhaust temperature
B.above normal with a normal exhaust temperature
C.below normal with a normal exhaust temperature
D.below normal with an above normal exhaust temperature