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

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

Closing the discharge valve allows the pump to reach its shutoff head, which is the maximum pressure the impeller can generate at a specific speed. Comparing this observed pressure against the manufacturer's performance curve is the most reliable, simplest field method to verify the pump's mechanical integrity and hydraulic performance.