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單項選擇題

In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）

A.fuel must be preheated
B.intake air should be preheated
C.lube oil outlet temperature should be increased 20℃ above normal
D.none of the above

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單項選擇題

Excessive diesel engine back pressure may be an indication of （）

A.carbon buildup in the exhaust manifold
B.overcooling of the exhaust manifold
C.eroded muffler baffle plates
D.high injection pressure

單項選擇題

A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）

A.early fuel injection
B.excessive bearing play within the running gear
C.overloading of the cylinder
D.all of the above