Why is the suction opening on a pump larger than the discharge opening?

The correct answer indicates that the suction opening on a pump is larger than the discharge opening specifically to ensure smooth flow and constant volume.

This design choice is crucial for optimal pump performance. When the suction opening is larger, it reduces the velocity of the incoming fluid at that point, which helps prevent turbulence and allows for a more consistent flow into the pump. A smooth flow is essential as it minimizes the risk of cavitation, which can occur when the fluid pressure drops too low and vapor bubbles form, potentially damaging the pump.

Moreover, by maintaining a larger suction diameter, the pump can handle fluctuations in flow demand better without causing significant pressure drops or interruptions. This consistency in volume is critical for maintaining efficiency and ensuring that the hydraulic performance of the pump remains stable under varying operational conditions.

The other options, while they may speak to different aspects of pump design or operation, do not directly capture the primary reason for having a larger suction opening in terms of flow dynamics and system performance.