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Black smoke coming from a boiler can be caused by _____.A.low water levelB.high water leve

Black smoke coming from a boiler can be caused by _____.

A.low water level

B.high water level

C.excessively high fuel pressure

D.low oil temperature

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第1题

The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of_______.

A.aluminum plates

B.lead cathodes

C.copper baffle plates

D.sacrificial zincs

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第2题

If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?

A.micro-seizure

B.sticking

C.scratched

D.breakage / collapse

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第3题

If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the _____.

A.combustion control air system

B.supply air system

C.ships service air system

D.low pressure deck air system

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第4题

If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be ___________.

A.insufficient fuel supply

B.faulty governor

C.high exhaust back pressure

D.all of the above may cause this problem

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