單項選擇題

Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.

A.compressor damage from improper lubrication
B.refrigerant absorption by the lubricant
C.increased viscosity in the lubricant
D.carbon deposit on the compressor suction valves

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單項選擇題

Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）

A.Spring-centered valve
B.Unloading valve
C.Three-position valve
D.Two-position valve

單項選擇題

Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）

A.Expansion valve
B.Condenser
C.Evaporator
D.Compressor