🔍 Key Concepts

• Look carefully at the number of suction (inlet) openings visible in both the front and side views of the pump casing and impeller. • Think about how the impeller vanes are curved and whether that shape would allow efficient operation in both directions or only in one direction of rotation. • Recall that a double inlet (double suction) centrifugal pump will usually show flow entering the impeller from both sides of the eye, not just one.

💭 Think About

• From the front (left) view, follow the flow path: where does liquid enter the pump, and how many distinct suction paths can you trace into the impeller eye? • Looking at the impeller vanes, imagine the shaft turning clockwise and then counter‑clockwise. In which case will the vanes throw the liquid smoothly into the volute, and in which case would they tend to scoop or oppose flow? • Compare what you see in the sectional (right) view with a typical textbook drawing of a single-suction versus double-suction centrifugal pump. Which one matches this cross‑section?

✅ Before You Answer

• Confirm whether there is one suction eye or two feeding the impeller in the sectional view. • Decide if the vane curvature clearly favors only one rotation (making reverse rotation inefficient) or appears symmetrical for either direction. • Verify that your chosen option’s wording about inlet count (single vs double) and rotation (one vs dual) matches what the illustration actually shows.