Refer to the partial drawing of two identical centrifugal pumps in a cooling water system (see figure below).
Each pump is driven by an identical three-phase AC induction motor.
The cooling water system is being returned to service following maintenance on the pumps.
Pump A was started five minutes ago to initiate flow in the cooling water system.
Pump B is about to be started.
When pump B is started, which one of the following will cause pump B to experience high starting current for a shorter time than usual before stabilizing at a lower running current?
A. Pump B is initially rotating in the reverse direction.
B. The motor coupling for pump B was removed and not reinstalled.
C. The packing gland for pump B was tightened since the pump last operated.
D. The voltage applied to the motor for pump B is 20 percent lower than normal.
Show Answer
Answer: B
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