单项选择题
A.cause of salt contamination B.location of salt water contamination C.chemical makeup of feed-water D.level of alkalinity in condensate
An increasing head pressure in a refrigeration system, ...
单项选择题An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A.restriction in refrigerant piping B.air and non-condensable gases in the condenser C.water in the refrigerant D.flooding back of liquid refrigerant from the evaporator
Which of the following problems could cause the high pr...
单项选择题Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A.A shortage of liquid refrigerant B.Excessive frost on the evaporator C.Excessive condenser cooling water D.Insufficient condenser cooling water flow
The general purpose of a heat exchanger is to （）.A.elim...
单项选择题The general purpose of a heat exchanger is to （）.
A.eliminate hot air from the condenser B.maintain steady pressure in a system C.heat, or cool one fluid by means of another fluid D.reduce the engine room temperature in tropical climates
