maintain adequate coil back pressure
prohibit flashing in the liquid line
reduce refrigerant volume in the system
reduce compressor discharge line loading
第1题：
liquid receiver
compressor
condenser
cooling coil
第2题：
a shortage of refrigerant in the system
air in the system
an accumulation of liquid refrigerant in the crankcase
a shortage of oil in the crankcase
第3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4题：
too much refrigerant in the system
oil entrained in the refrigerant
less than a full charge of refrigerant in the system
ice crystals forming in the refrigerant
第5题：
latent heat of expansion
sensible heat of condensation
heat of compression
all of the above
第6题：
sudden evaporation of wax crystals in the lubricant
sudden evaporation of entrapped air in the lubricant
release of refrigerant from the oil/refrigerant mixture
release of dissolved lubricant from the refrigerant
第7题：
compressor
condenser
receiver
evaporator
第8题：
insufficient condenser cooling water
excessive condenser cooling water
air in the refrigeration system
excessive refrigerant in the system
第9题：
maintain adequate coil back pressure
prohibit flashing in the liquid line
reduce refrigerant volume in the system
reduce compressor discharge line loading
第10题：
passing it through the expansion valve
condensing refrigerant in the system condenser
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
maintaining a high pressure on the systems receiver