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
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相关考题
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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 -
单项选择题
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A.Cross
B.Parallel
C.Counter
D.Circular -
单项选择题
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
A.remain constant along the tubes length
B.be greatest in a single pass counter flow heat exchanger
C.remain constant throughout the heat exchanger
D.vary from section to section through out the heat exchanger
