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Impulse turbine efficiencies: identify mechanical efficiency definition Select the correct definition of <strong>mechanical efficiency</strong> for an impulse turbine. Assume 'energy imparted to the wheel' refers to power at the runner (work done on the wheel). Choose the correct option.

Difficulty: Easy

Correct Answer: Actual work available at the turbine shaft ÷ energy imparted to the wheel (runner power)

Explanation:


Concept
Mechanical efficiency ηm accounts for mechanical (frictional) losses between runner and shaft: ηm = Shaft power / Runner power.


Option mapping
(a) is overall efficiency (shaft power ÷ hydraulic power from head).(b) matches ηm.(c) is hydraulic efficiency (runner power ÷ jet power).


Final Answer
Actual work available at the turbine shaft ÷ energy imparted to the wheel (runner power).

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