單項選擇題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


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1.單項選擇題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

2.單項選擇題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

5.單項選擇題Excessive lube oil consumption can result from worn or broken()

A.piston rings
B.valve guides
C.valve seals
D.all of the above