Consider two identical single-speed AC induction motors, one of which is connected to a radial-flow centrifugal pump and the other to a reciprocating-type positive displacement pump (PDP) ___

Consider two identical single-speed AC induction motors, one of which is connected to a radial-flow centrifugal pump and the other to a reciprocating-type positive displacement pump (PDP).

Both pumps are taking suction at the same elevation from a vented water storage tank.

Each pump has a maximum design backpressure of 800 psig, and each is operating with the following initial conditions:

Flow rate = 200 gpm
Backpressure = 400 psig
Motor current = 100 amps

If the backpressure for each pump increases to 600 psig, the centrifugal pump will have a __________ flow rate than the PDP; and the centrifugal pump will have a __________ motor current than the PDP.

A. lower; higher
B. lower; lower
C. higher; higher
D. higher; lower

Show Answer

Answer: B

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