单项选择题

The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）

A.air compressor
B.diffuser
C.after-cooler
D.ventilator

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单项选择题

Which of the listed set of conditions indicates early fuel injection timing?（）

A.Loss of engine power and high exhaust temperatures
B.Higher than normal firing pressure and low exhaust temperatures
C.High fuel consumption and high exhaust temperatures
D.Lower than normal compression pressure and high exhaust temperature

单项选择题

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

单项选择题

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