Correct option is C
Centrifugal pumps are designed with different blade shapes to optimize performance and efficiency. The key considerations include:
· Forward-curved blades: Provide high head but lower efficiency and are prone to overloading.
· Backward-curved blades: Offer higher efficiency, stable performance, and avoid overloading. They are preferred for maximum efficiency in centrifugal pumps.
· Straight blades: Moderate efficiency but less common.
· Wave-shaped blades: Not standard; typically not used.
Maximum efficiency is achieved with backward-curved blades because they reduce turbulence and energy losses, and operate efficiently over a wider range of conditions.
