907. Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?

The pump packing gland overheats after short operating periods.
Pounding noises can be heard at the pump suction chest.
The pump delivers full capacity when started, but gradually slackens off to an abnormally low flow.
The motor overcurrent protective device continually shuts the pump down.

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