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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

Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）

A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure

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单项选择题

Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）

A.sludge
B.water
C.micro-organism growth
D.all of the above

单项选择题

Excessively worn, or polished ends on a diesel engine valve spring, indicate（）

A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats

单项选择题

A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）

A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs

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