An AC motor-driven centrifugal pump was just started.
During the start, motor current remained peaked for 6 seconds before decreasing to standard running current.
Normally, the starting current peak lasts about 4 seconds.
Which one of the following could have caused the extended starting current peak?
A. The pump shaft was seized and did not turn.
B. The pump was initially rotating slowly in the reverse direction.
C. The pump discharge check valve was stuck closed and did not open.
D. The pump was initially air bound, and then primed itself after 6 seconds of operation.
Show Answer
Answer: B
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