单项选择题

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

点击查看答案&解析

上一题目录下一题

相关考题

单项选择题

Scale accumulation on evaporator heat exchange surfaces （）.

A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
D.reduces heat transfer

单项选择题

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

单项选择题

The valve best suited for throttling gas or liquid flow in a pipeline is the（）.

A.gate valve
B.globe valve
C.check valve
D.plug cock