單項(xiàng)選擇題A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in （）

A.pilot valve oil pressure
B.speeder spring force
C.compensation needle valve clearance
D.centrifugal force on the flyweights


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題Fuel is ignited in a diesel engine cylinder by （）

A.a spark plug
B.injectors
C.the heat of compression
D.increasing jacket water temperatures