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

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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

单项选择题

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

单项选择题

In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ