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單項選擇題

Heavy residual fuel oils are heated prior to centrifuging to （）

A.reduce fuel weight
B.increase specific gravity
C.separate fuel from lube oil
D.reduce fuel viscosity

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單項選擇題

In a diesel engine, blow-by is generally the result of worn（）

A.valve guides
B.oil control rings
C.valve seats
D.compression rings

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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