單項選擇題

The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.

A.increase the refrigerating effect, by decreasing the amount of flash gas
B.allow the refrigerant to enter the throttling device in a saturated condition
C.increase the refrigerating effect by increasing the amount of flash gas
D.minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side

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單項選擇題

Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.

A.maintain adequate coil back pressure
B.prohibit flashing in the liquid line
C.reduce refrigerant volume in the system
D.reduce compressor discharge line loading

單項選擇題

An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.

A.maintaining a steadier speed
B.delivering liquids over greater distances
C.operating for longer periods of time
D.producing a smoother discharge flow

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The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.

你可能感興趣的試題

Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.

An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精