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.
Mechanical Engineering
Hydraulic Machines
Difficulty: Easy
Choose an option
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ATrue — maximum efficiency occurs with backward-curved blades
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BFalse — forward-curved blades give maximum efficiency
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CFalse — radial blades give maximum efficiency
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DEfficiency is independent of blade curvature
Answer
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.