Consider two identical single-speed AC induction motors, one of which is connected to a radial-flow centrifugal pump and the other to a rotary-type positive displacement pump (PDP).
Both pumps are taking suction from the bottom of a vented water storage tank.
Each pump is operating with the following initial conditions:
Flow rate = 200 gpm
Backpressure = 600 psig
Motor current = 100 amps
If the backpressure for each pump decreases to 400 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; lower
B. lower; higher
C. higher; lower
D. higher; higher
Show Answer
Answer: D
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