單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題A condition that can increase the foaming tendency of lube oil is （）

A.excessively high oil temperatures
B.water or moisture contamination
C.fuel dilution
D.life its cylinder relief vales