單項選擇題In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）

A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance


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1.單項選擇題Diesel engine blow-by is the leakage of combustion gases past the （）

A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves

2.單項選擇題In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）

A.wrist pin bushings
B.compression rings
C.cylinder liner seals
D.cylinder liner sealing ring

3.單項選擇題A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）

A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds

4.單項選擇題Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）

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

5.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