【单选题】A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should _____.
A.
drill holes through the heavy side of the impeller until it balances
B.
weld counterweights to the light side of the impeller
C.
remove metal from the heavy side by machining in a lathe
D.
acid wash and serape the heavy side until it balances
【单选题】Increasing the speed of a centrifugal pump will result in an increase in its capacityAnother 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