Refer to the partial drawing of two identical radial-flow 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 would cause the motor ammeter for pump B to remain off-scale high for a longer time than usual before stabilizing at a lower running current?
A. Pump B was initially rotating in the reverse direction.
B. The motor coupling for pump B was removed and not reinstalled.
C. The packing material for pump B was removed and not reinstalled.
D. Two phases of the motor windings for pump B were electrically switched.
Show Answer
Answer: A
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