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单选题
Before starting an engine by air, the engine must（）
A
be turned by a turning gear for at least one minute
B
be turned by a turning gear for at least two minutes
C
be turned at least one complete turn
D
be turned at least two complete turns
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单选题Which of the following may lead to the engine NOT to start on air?（）A
starting air pressure too highB
correct timing of starting air valvesC
three of the six starting valves stuckD
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考题
单选题The engine will fail to start unless （）.A
the pressure of the starting air is high enoughB
there is enough air in the air reservoirsC
the air is supplied into the cylinders in the appropriate sequenceD
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考题
单选题Which of the following may cause that an engine doesnt run on starting air?（）A
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单选题Before starting any diesel or gasoline engine，which of the following must be checked? （）A
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单选题After the engine is warned, we should（） the turning gear before starting up the engine.A
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take outD
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单选题（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.A
BecauseB
Owing toC
ForD
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考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
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单选题The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.A
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refrigeration compressorC
vacuum pumpD
purifier
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