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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）

A.back clearance
B.side clearance
C.gap clearance
D.taper clearance

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单项选择题

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

单项选择题

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

单项选择题

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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