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单选题
Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）
A
Radiation
B
Conduction
C
Convection
D
Each of the above
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单选题“The use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking” According to this sentence, we can know that the principle reason of the overheating and thermal cracking is（）A
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Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
Block cooling water passages to the headD
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Return-flowB
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CrossB
ParallelC
CounterD
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单选题Which of the statements listed concerning heat transfer is correct?（）A
Heat is always transferred at a constant rateB
Heat transfer rate increases as temperature difference increasesC
The rate of heat transfer is not affected by temperature differenceD
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单选题The rate of heat transfer from a hot region to a cold region is affected most by the （）.A
size of the heat sinkB
temperature difference between the regionsC
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单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
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单选题In which of the listed refrigeration system components does superheating of the refrigerant take place?（）A
Expansion valveB
EvaporatorC
DrierD
Receiver
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对B
错
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Develop ductilityB
Improve machining qualitiesC
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考题
单选题Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）A
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Forced convection onlyC
Both natural convection and forced convectionD
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单选题When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）A
CO2B
Methyl chlorideC
R-22D
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单选题0f all the extinguishing agents listed below, which one has the greatest capacity for heat adsorption?（）.A
Water fogB
Carbon dioxideC
Dry chemicalD
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HeatsinkB
FanC
Liquid coolingD
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Constant pressureB
PulseC
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Thermal expansion valve frozen openB
Suction gas heat exchanger bypassedC
Condenser clogged or fouledD
High pressure cutout switch inoperative
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