The primary function of a centrifugal pump volute is to __________.

Correct Answer: Option D — convert velocity to pressure

The volute is a spiral-shaped casing that increases in cross-sectional area toward the discharge. As fluid exits the impeller at high velocity, the expanding area of the volute slows the fluid down, effectively converting the kinetic energy (velocity) into potential energy (pressure) according to Bernoulli's principle.