Question 177General Subjects - 1st Asst/Chief

The correct answer is C) close off the discharge valve, and watch for a rise in pressure. This is the simplest method to determine if a centrifugal pump is operating as designed. By closing off the discharge valve, the pump will build up pressure, which can be observed. If the pressure rises as expected, it indicates the pump is functioning properly. This method directly tests the pump's ability to generate the required discharge pressure. The other options are incorrect because they do not directly evaluate the pump's performance. Option A measures the motor current, which can be affected by factors other than pump operation. Option B measures the discharge temperature, which is an indirect indicator. Option D tests the suction side, which does not directly assess the pump's discharge performance.