單項(xiàng)選擇題The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

A.system is overcharged with refrigerant
B.system is low on refrigerant
C.discharge valves are leaking excessively
D.discharge valves are leaking slightly


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2.單項(xiàng)選擇題A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

A.purge lube oil from the liquid refrigerant
B.recover water purged from the system
C.separate foul gases from the receiver
D.purge non-condensable gases without losing refrigerant

3.單項(xiàng)選擇題A re-heater, as used in an air conditioning system, is designed to control the （）

A.chilled water temperature
B.dew point temperature
C.primary air temperature
D.dry bulb temperature

4.單項(xiàng)選擇題Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）

A.A room thermostat activates an electric heater at each individual chilled air outlet when necessary
B.Varying the number of passes the air makes across the coils
C.Varying the temperature of the water through the coils
D.Varying the quantity of water flowing through the coils

5.單項(xiàng)選擇題As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.

A.increase
B.decrease
C.remain unchanged
D.be greatest at dew point