An increase in rotor clearances in a rotary pump will __________.

Correct Answer: Option A — decrease pump capacity

Rotary pumps function by trapping fluid between gear teeth and the casing. Increased rotor clearances allow high-pressure fluid to leak back to the suction side, a phenomenon known as slippage. This internal recirculation directly reduces the net volumetric output, thereby decreasing the overall capacity of the pump unit.