The simplest method to use for determining if a centrifugal pump is operating as designed is to __________.

Correct Answer: Option D — close off the discharge valve, and watch for a rise in pressure

Closing the discharge valve on a centrifugal pump allows the operator to check the shut-off head. If the pressure rises to the manufacturer's specified value, the pump is developing the correct head and the impeller is intact. This is a quick, standard diagnostic test for verifying pump performance.