单项选择题
What is the purpose of sub cooling R-12 in the condenser?（）
A.to increase the system efficiency by sensible heat transfer
B.to stop the liquid from flashing
C.to reduce the load on the compressor
D.to remove latent heat of vaporization and the suction piping transfer
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相关考题
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单项选择题
In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）
A.its pressure and temperature are both lowered
B.its pressure and temperature are both raised
C.its pressure is lowered and its temperature is raised
D.its pressure is raised and its temperature is lowered -
单项选择题
The solenoid valve can be typed as a（）
A.thermal valve
B.magnetic stop valve
C.bellows valve
D.bimetallic valve -
单项选择题
If the compressor runs continually, the cause might be the（）
A.high-pressure cutout switch is jammed open
B.low-pressure switch is jammed shut
C.thermal bulb is not operating properly
D.scale trap is clogged
