單項(xiàng)選擇題Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?()

A.Correct the cause of the scoring and repair the sleeve or replace with a new one
B.Reassemble the unit and provide more water leak off for proper lubrication
C.Check for parallel alignment of the sleeve radial faces to the sleeve bores
D.Reassemble the unit and adjust the governor to obtain a slower speed


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2.單項(xiàng)選擇題For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?()

A.Chilled water system supply temperature
B.Chilled water system return temperature
C.Compressor discharge temperature
D.Compressor suction pressure

4.單項(xiàng)選擇題The operating water is supplied under the ()of an oil separator.

A.sliding bowl bottom
B.bowl hood
C.bowl
D.filter units

5.單項(xiàng)選擇題The ()has a water damp ring.

A.purifier
B.oil/water separator
C.incinerator
D.distiller