单项选择题

Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）

A.scavenging
B.forced draft
C.turbo-charging
D.aspiration

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In a four-stroke/cycle diesel engine, badly worn intake valve guides can cause excessive（）.

A.exhaust pressure
B.exhaust temperatures
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Significant retardation of a diesel engine fuel injection timing will result in （）

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Which of the following condition is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?（）

A.Indicated exhaust pressure readings will increase
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C.Indicated cylinder temperature readings will increase
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