單項(xiàng)選擇題Which of the following may take place if the clearance of the main bearings are excessive?（）

A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above


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1.單項(xiàng)選擇題Which of the following may lead to the engine NOT to start on air?（）

A.starting air pressure too high
B.correct timing of starting air valves
C.three of the six starting valves stuck
D.the turning gear disengaged

2.單項(xiàng)選擇題Which of the following may cause that an engine doesnt run on starting air?（）

A.too low starting air pressure
B.main start valve closed
C.neither A nor B
D.A and B

3.單項(xiàng)選擇題Which of the following is true about the fuel injection with an ordinary diesel engine?（）

A.The process begins after TDC
B.The process ends before TDC
C.When the piston is near to the TDC the fuel injection ends
D.None of the above is true

4.單項(xiàng)選擇題Which of the following is a factor of fuel oil almost having nothing to do with the formation of combustion products?（）

A.setting point
B.ash
C.sulfur content
D.carbon residues

5.單項(xiàng)選擇題Which of the following firing order may be used for an 6 cylinder engine?（）

A.1-2-3-4-5-6
B.1-2-3-6-5-4
C.1-5-3-6-2-4
D.1-3-4-5-6-2