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单选题
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）
A
engine overload
B
leaky valves
C
stuck or broken piston rings
D
low air injection pressure
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engine overloadB
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crankshaft speed in a two-stroke cycle diesel engineC
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increasing the quantity of starting airB
increasing the lube oil pressureC
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单选题Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）A
Lubrication to the defective cylinder should be increasedB
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单选题Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）A
To reduce the main engine speedB
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单选题When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）A
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单选题Defective atomizer in a diesel engine will lead to（）.A
smoky exhaustB
starting failureC
overloadD
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单选题Defective air cooler in a diesel engine will lead to （）.A
smoky exhaustB
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overloadD
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smoky exhaustB
starting failureC
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
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单选题If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）A
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单选题In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）A
governor droopB
speeder spring tensionC
fuel rack lagD
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bad combustionC
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the same as engine speedC
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increased exhaust temperatureC
black smokeD
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单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）A
twice the crankshaft speedB
half the crankshaft speedC
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