單項選擇題For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable()

A.throughput
B.additive percent
C.cetane number
D.TBN number


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2.單項選擇題In a four-cycle diesel engine piston blow-by can result in increased()

A.crankcase pressure
B.compression pressure
C.scavenge pressure
D.exhaust manifold pressure

3.單項選擇題The most effective method in removing water from diesel fuel oil is by()

A.centrifuging the fuel
B.using it in the engine
C.heating the fuel tanks
D.starting the fuel

4.單項選擇題On board supply vessels, a centrifuge is normally used to purify()

A.cooling water
B.fuel oil
C.sea water
D.diesel intake air

5.單項選擇題Water accumulating in the crankcase of a diesel engine could indicate()

A.a cracked cylinder liner
B.excessive water in the fuel
C.a leaking intercooler
D.excessive moisture in the scavenge air