单项选择题
If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A.pump would be very noisy
B.pump would vibrate excessively
C.pump would develop insufficient flow
D.stuffing box would leak excessively
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相关考题
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单项选择题
The packing installed in the pump stuffing box is lubricated by （）.
A.gravity and feed oil cups
B.grease cups
C.hand during installation
D.leakage through the stuffing box -
单项选择题
The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.
A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer -
单项选择题
Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）
A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate
