单项选择题X 纠错
A.build up the piston crown by metal spraying
B.build up the cylinder head by metal spraying
C.insert shims between the crankpin bearing box and the connecting rod foot
D.install a thinner head gasket
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单项选择题
A.cetane number of 55
B.cetane number of 45
C.octane number of 55
D.octane number of 45
单项选择题
A.increase
B.decrease
C.remain the same
D.increase on compression decrease on expansion
单项选择题
A.ignition quality of the fuel
B.high heating value of the fuel
C.amount of carbon residue after combustion
D.internal flow resistance in the injectors
单项选择题
A.has little or no internal friction
B.has a lower effective compression ratio
C.operates with scavenge air under a positive pressure
D.operates without energy absorbing intake and exhaust strokes
单项选择题
A.Decreased connecting rod bearing clearance
B.Increased connecting rod bearing clearance
C.Decreased compression ratio
D.Increased compression ratio
单项选择题
A.less fuel will enter the cylinder
B.higher the cylinder combustion temperature
C.more complete the fuel combustion
D.more rapid the rise in combustion pressure
单项选择题
A.dust entering the high pressure stage
B.lube oil carbonization
C.discharge pulsations
D.inter-stage vapor lock
单项选择题
A.increased compression ratio
B.decreased compression ratio
C.increased bearing clearance
D.decreased bearing clearance
单项选择题
A.The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbon
B.The higher the cetane number, the shorter the ignition lag
C.The highest cetane number of fuel is 100
D.All of the above
单项选择题
A.The cetane number affects the amount of injection lag
B.The cetane number is an indication of the fuels viscosity
C.Ignition lag is reduced with fuels having a high cetane number
D.The cetane number is of little significance in the combustion process