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


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1.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

2.單項(xiàng)選擇題Which of the following can be obtained by means of an indicator card?（）

A.the peak pressure in a cylinder
B.the temperature of the cooling water
C.the fuel consumption
D.none of the above

3.單項(xiàng)選擇題Which of the following can be directly obtained by means of an indicator card?（）

A.power
B.maximum pressure in a cylinder
C.mean pressure in a cylinder
D.all of the above

4.單項(xiàng)選擇題Which factor of the following affects not only the fuels combustion but also the engine’s maintenance?（）

A.cetane number
B.flash point
C.viscosity
D.setting point

5.單項(xiàng)選擇題Which cause of the following can 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 starting valves stuck
D.the turning gear disengaged