單項選擇題Most solenoid valves are actuated by ().

A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure


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1.單項選擇題When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil ().

A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced

2.單項選擇題If the refrigeration compressor crankcase is sweating, the cause may be due to ().

A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout

3.單項選擇題The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is ().

A.evaporation is accomplished in a vacuum
B.due to the higher temperature of the incoming feed
C.due to the latent heat of evaporation principle
D.evaporation in a submerged medium produces more distillate

5.單項選擇題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