單項選擇題In which of the listed refrigeration system components does superheating of the refrigerant take place?()

A.Expansion valve
B.Evaporator
C.Drier
D.Receiver


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1.單項選擇題Excessive lube oil consumption by a reciprocating air compressor can be caused by ().

A.using a slightly dirty air filter
B.using oil having an excessive viscosity
C.intercooler or after-cooler leaks
D.carrying the oil level higher than normal

2.單項選擇題The effect of high vapor superheat in a refrigeration system, is a/an ().

A.increased capacity of the compressor
B.more efficient operation of the thermal expansion valve
C.decreased capacity of the compressor
D.loss of receiver capacity

3.單項選擇題A dirty intercooler on an air compressor will cause ().

A.damage to the un-loader operating diaphragm
B.an increase in current flow to the motor
C.high pressure in the receiver and filter
D.an excessive consumption of crankcase oil

5.單項選擇題Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?()

A.Gravity siphon effect
B.Higher vacuum in the second-stage
C.Difference in brine density between first and second stages
D.lower pressure in first-stage