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单选题
The heat gained per pound of refrigerant in the evaporator is known as the（）.
A
latent heat of vaporization
B
sensible heat
C
refrigerating effect
D
specific heat of vaporization
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opening a drain petcock on the oil separatorC
condensing the water in the heat exchangerD
using a dehydrator cartridge
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passing it through the expansion valveB
condensing refrigerant in the system condenserC
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maintaining a high pressure on the systems receiver
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the distillate produced has greater purityB
no boiling occurs on heat transfer surfacesC
evaporation occurs at a higher rateD
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单选题Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.A
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fewC
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单选题The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.A
aboveB
belowC
equal toD
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liquid refrigerant pressure at the solenoid valveC
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the suction temperature to increaseC
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