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

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热门试题

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

单项选择题The bulb for the thermal expansion valve is located（）

A.in the middle of evaporator coils
B.near the evaporator coil outlet
C.near the evaporator coil inlet
D.on the bottom row of evaporator coils

单项选择题The thermal expansion valve responds to the（）

A.amount of superheat in the vapor leaving the coil
B.amount of superheat in the liquid
C.temperature in the evaporator coils
D.pressure in the evaporator coils

单项选择题The thermostatic valve has a throttling action, that is to say the valve can（）

A.stop the refrigerant from flowing
B.force the refrigerant to flow
C.cause the refrigerant pressure to rise
D.cause the refrigerant pressure to fall