单项选择题

Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.

A.the distillate produced has greater purity
B.no boiling occurs on heat transfer surfaces
C.evaporation occurs at a higher rate
D.the incoming feed is at a higher temperature

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单项选择题

A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.

A.the system is fully charged
B.there is air leaking in from the condenser
C.ice crystals are forming in the refrigerant
D.the system contains less than a full charge of refrigerant

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Which of the filter/strainer units listed permits you to clean the element while leaving the system on the line?（）

A.Simplex
B.Duplex
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单项选择题

A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.

A.condition of the expansion valve
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C.condition of the compressor suction valves
D.condenser temperature