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单选题
In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）
A
the burning of the fuel； medium shaft
B
fuel spray； fresh air
C
fuel； fuel spray
D
the burning of the fuel； the burned gas mixture
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考题
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单选题The function of diesel engine piston compression rings is to （）.A
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reduce electrolytic action on heat exchanger metalsB
keep heat transfer surfaces shiny and cleanC
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考题
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excessive piston to liner clearanceB
excessive dirt beneath the piston crown that reduces heat transferC
faulty nozzle sprayD
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考题
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
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考题
单选题In a diesel engine,（） works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment（）A
fuel spray； the burning of the fuelB
the burned gas mixture； connecting rodC
medium shaft；crankshaftD
the burned gas mixture； piston rod
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