单项选择题

Significant retardation of a diesel engine fuel injection timing will result in （）

A.smoother engine operation
B.advanced fuel ignition
C.increased fuel economy
D.reduced engine power

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单项选择题

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
B.Pyrometer responses will be retarded
C.Indicated cylinder temperature readings will increase
D.Indicated firing pressure readings will increase

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Excessive lubricating oil consumption in a running diesel engine can be caused by （）

A.clogged lube oil piping
B.excessive valve-guide clearance
C.high lube oil viscosity
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单项选择题

If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

A.backfire through the air intakes
B.develop less power under load
C.have high firing pressures
D.lift its cylinder relief valves