单项选择题
When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.
A.always be wide open when the compressor restarts
B.continue to operate as if the system were in operation
C.remain open until evaporator pressure equalizes, then close until the compressor restarts
D.always be completely closed until the compressor restarts
相关考题
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单项选择题
To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.
A.discharge service valve as a vapor
B.suction service valve as a liquid
C.charging valve as a liquid
D.condenser purge valve as a vapor -
单项选择题
When adding oil to a refrigeration system, precautions must be taken to ensure that （）.
A.the compressor suction pressure is not too high
B.all air is purged from the pump and charging fittings
C.the high pressure cutout switch is held open to prevent accidental starting
D.the condenser is completely shutdown first -
单项选择题
In a refrigeration system, if the cooling water to the condenser fails, the（）.
A.box temperature solenoid valve will close
B.expansion valve will close
C.compressor will shutdown
D.king valve will open
