the relief valve should open before the high pressure cutout
the relief valve should open and allow the excess refrigerant to flow to the receiver
the high pressure cutout switch should operate before the relief valve opens
you should close in on the suction valve
第1题：
Low compressor head pressure in a refrigeration system can be caused by ___.
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system
第2题：
The refrigeration system low pressure cutout switch is actuated by______.
A.an electric system manager
B.a sensing bulb at the tail coil of the evaporator
C.pressure changes in the suction line
D.failure of the king solenoid valve
第3题：
If a refrigeration compressor is short cycling on high head pressure, you should
A.purge the condenser if the waterside is dirty
B.check for proper water flow through the condenser
C.increase the high pressure cutout setting
D.reduce the cooling water flow
第4题：
compressor；condenser
condenser；evaporator
throttle valve；evaporator
evaporator；condenser
第5题：
pressurestat
high pressure cutout
solenoid valve
low pressure cutout switch
第6题：
In the refrigeration system, a shortage of refrigerant is indicated by
A.the compressor short cycling on high pressure cut out switch
B.high suction pressure
C.high head pressure
D.bubbles in the sight glass
第7题：
insufficient condenser cooling water
excessive condenser cooling water
air in the refrigeration system
excessive refrigerant in the system
第8题：
If the head pressure of a reciprocating refrigeration compressor is excessive
A.the relief valve should open before the high pressure cutout
B.the relief valve should open and allow the excess refrigerant to flow to the receiver
C.the high pressure cutout switch should operate before the relief valve opens
D.you should close the discharging valve
第9题：
increase the flow of the cooling water through the condenser
adjust the high pressure cutout to maintain the desired pressure
open the hot gas bypass temporarily to reduce capacity
purge non-condensable gases to reduce the excess pressure
第10题：
restriction in refrigerant piping
air and non-condensable gases in the condenser
water in the refrigerant
flooding back of liquid refrigerant from the evaporator