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Centrifugal pump vane outlet angle and efficiency: statement on backward-curved blades Consider the choice of blade outlet angle in a centrifugal pump. Assess the statement: “The efficiency of a centrifugal pump will be maximum when the blades are bent backward.” Choose the correct option.

Difficulty: Easy

Correct Answer: True — maximum efficiency occurs with backward-curved blades

Explanation:

ConceptBackward-curved vanes provide a stable head–discharge characteristic and lower outlet whirl, reducing losses and improving efficiency.

ComparisonForward-curved vanes can yield higher theoretical head but suffer from higher losses and unstable characteristics; radial vanes are intermediate.

Final AnswerTrue — maximum efficiency occurs with backward-curved blades.

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