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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

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

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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

单项选择题

Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）

A.back
B.side
C.gap
D.bottom

单项选择题

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

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