单项选择题

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

A.exhaust pressure
B.exhaust temperatures
C.cooling water temperatures
D.lube oil consumption

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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

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

单项选择题

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
D.low lube oil temperature