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Pump performance ratio: name the ratio based on delivered flow Definition: The ratio of liquid actually discharged per second by the pump to the liquid passing per second through the impeller. Identify the correct efficiency term for this ratio. Choose the correct option.

Difficulty: Easy

Manometric efficiency
Mechanical efficiency
Overall efficiency
Volumetric efficiency

Correct Answer: Volumetric efficiency

Explanation:

Definitions

Volumetric efficiency = Q_actual / Q_impeller (accounts for leakage and slip).
Manometric efficiency relates head rise to theoretical head.
Mechanical efficiency accounts for mechanical losses.
Overall efficiency = (product of hydraulic × volumetric × mechanical).

Final Answer
Volumetric efficiency

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