The purpose of the wearing rings used in a centrifugal pump is to _____.
A.prevent an internal explosion in the pump when it is overheated
B.enable a visual inspection of the pump while it is running
C.insure a proper alignment of the pump coupling to the driver
D.accommodate for friction between the impeller and the easing
第1题
A.Piston
B.Sounding
C.Regulating
D.Connecting
第2题
A.accidents
B.special valve chests
C.interchangeable blanks
D.connecting passages
第3题
A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction
第4题
A.To prevent internal damage form. local overheating
B.To ensure the fuel nozzles are flushed clean
C.To clear the smoke stack
D.To let the waste heat boiler reduce its rate of steam generation
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