單項選擇題Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

A.Impurities
B.Lube oil
C.Gasoline
D.Diesel fuel


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1.單項選擇題The most common contaminate of governor hydraulic fluid is （）.

A.moisture
B.dirt
C.acid
D.air

2.單項選擇題The purpose of the safety relief valves installed on an auxiliary boiler is to （）.

A.relieve excess fuel oil pressure during the “off” fire cycle
B.admit water to the dry pipe
C.throttle the forced draft fan output for proper combustion
D.reduce excess steam pressure in the boiler

4.單項選擇題Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder

5.單項選擇題In a diesel engine cooling water system, a pH of 60 indicates a/an （）.

A.slightly acidic condition
B.slightly alkaline condition
C.overtreatment of water
D.neutral condition of water