單項(xiàng)選擇題If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.

A.low compression
B.failure of the fuel pump to discharge fuel
C.incorrect timing of fuel pump
D.turning gear being still on


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1.單項(xiàng)選擇題If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

A.failure of the fuel pumps
B.starting air pressure too low
C.stop valve in air line closed
D.the turning gear still engaged

2.單項(xiàng)選擇題If the engine does not start on air, it may be due to （）

A.low compression of the fuel pumps
B.incorrect timing of fuel pumps
C.the starting air valves stuck
D.air-locks in fuel oil pipeline

3.單項(xiàng)選擇題If the engine （） for a long period, there will be a danger of frost.

A.must to stand inoperative
B.has to stand inoperative
C.must be stood idle
D.will stand idle

4.單項(xiàng)選擇題If the atomizer holes are enlarged beyond the makers recommended size, the atomizer must be （）.

A.repaired
B.replaced
C.replenished
D.repeated

5.單項(xiàng)選擇題If diesel oil in this tank is used, the （） of the oil must not exceed 120 degree F.

A.viscosity
B.flash point
C.acid value
D.temperature