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单选题
Either a low injection pressure or a leakage of piston rings is able to lead （）.
A
a high exhaust temperature
B
a high smoky exhaust
C
a high output
D
a high compression
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lower than normal cylinder pressure and high exhaust temperatureC
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单选题Early injection timing is indicated by （）.A
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wide compression rings are usedB
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单选题Black areas on the sealing surfaces of piston rings indicate（）A
lube oil pumpingB
rotating ringsC
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
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the pressure regulating valve is not closingB
an excessive lack of refrigerant in the systemC
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考题
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单选题Low compression pressure in a diesel engine may be the result of （）A
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lengthy exhaust valve durationC
extend operation at light loadD
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考题
单选题Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）A
thermalB
mechanicalC
plasticD
elastic
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