單項選擇題

Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

A.The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B.The pump packing gland overheats after short operating periods
C.The motor over-current protective device continually shuts the pump down
D.Pounding noises can be heard at the pump suction chest

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單項選擇題

Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.

A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller

單項選擇題

If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.

A.run continuously
B.not start
C.have high discharge pressure
D.short cycle on the high pressure switch

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Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

你可能感興趣的試題

Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.

If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.

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