單項(xiàng)選擇題In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

A.two crankshaft revolutions in a two-stroke/cycle engine
B.two power strokes in a two-stroke/cycle engine
C.one power stroke in a two-stroke/cycle engine
D.two piston strokes in a two-stroke/cycle engine


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1.單項(xiàng)選擇題If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.

A.at each control station
B.in the chief engineer’s quarters
C.in the captains quarters
D.All of the above are correct

2.單項(xiàng)選擇題White smoke exhausting from an operating diesel engine may indicate （）.

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air

3.單項(xiàng)選擇題Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

A.increasing the volume of intake air
B.shutting off the fuel supply
C.increasing the engine back pressure
D.over-speeding the engine

4.單項(xiàng)選擇題When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）

A.During operation at low speed
B.During operation at rated speed, but low power output
C.During acceleration
D.All of the above

5.單項(xiàng)選擇題If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

A.compression pressures are below normal
B.lube oil is diluted with fuel oil
C.cranking speed is too low
D.exhaust system is partially restricted