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
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1.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
2.單項選擇題In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）
A.injection lag
B.ignition delay
C.compression
D.turbulence lag
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