单项选择题
Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
A.Impeller
B.Electric motor
C.Volute
D.Eye
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Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems -
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Scale accumulation on evaporator heat exchange surfaces （）.
A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
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In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.
A.positive head
B.negative suction head
C.mechanical seal
D.vent valve attached to the casing at the top of the volute
