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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must

have a cylinder oil having a ________.

A.low TBN value

B.high alkaline reserve

C.low flash point

D.high pour point

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第1题

Main steam and exhaust pipes for winches and similar gear shall not pass through crew accommodation nor, whenever technically possible, through alleyways leading to crew accommodation; where they do pass through such alleyways, they shall be adequately .

A.ventilated and tagged

B.ventilated and cooled down

C.insulated and encased

D.insulated and warmed up

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第2题

The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as _____.

A.chemical ignition

B.spontaneous combustion

C.chemical combustion

D.radiation ignition

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第3题

_____ the bodies are, _____ the friction will be.

A.The smoother/the greater

B.Smoother/less

C.The rougher/ the greater

D.rougher/greater

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第4题

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the _____.

A.propeller hub

B.lignum vitae

C.shaft packing

D.labyrinth seal

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