单项选择题

Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）

A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser

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单项选择题

A diesel engine will lose power if fuel injection occurs too early because the （）

A.fuel will not be properly atomized in the cylinder
B.ignition will be delayed due to low ignition temperature
C.maximum fuel expansion will occur on the compression stroke
D.fuel will ignite before top dead center

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

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