单项选择题

The scale trap is located between the （）

A.king valve and the expansion valve
B.solenoid valve and expansion valve
C.evaporator and receiver
D.compressor and evaporator

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单项选择题

The relief valve is located on the（）

A.discharge side of condenser
B.discharge side of compressor
C.outlet of the evaporator
D.receiver tank

单项选择题

If the compressor-discharge temperature is higher than the receiver temperature（）

A.increase the amount of cooling water to the condenser
B.decrease the amount of cooling water to the condenser
C.add more refrigerant to the system
D.remove some of the refrigerant from the system

单项选择题

If the head pressure is too high,（）

A.the relief valve should open before the high-pressure cutout
B.the relief valve should open and let excess refrigerant go to receiver
C.the high-pressure cutout switch should operate before the relief valve opens
D.close in on the suction valve