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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相关考题
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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
