Overall efficiency of a reaction turbine: choose the correct ratio Define the overall efficiency (η overall ) for a reaction turbine in terms of power and available hydraulic energy. Choose the correct expression.

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Overall efficiency of a reaction turbine: choose the correct ratio Define the <strong>overall efficiency</strong> (η<sub>overall</sub>) for a reaction turbine in terms of power and available hydraulic energy. Choose the correct expression.

Difficulty: Easy

Power produced by the turbine ÷ energy actually supplied by the turbine (ρ g Q H)
Actual work at the turbine ÷ energy imparted to the wheel
Work done on the wheel ÷ energy (head) actually supplied to the turbine
None of the above

Correct Answer: Power produced by the turbine ÷ energy actually supplied by the turbine (ρ g Q H)

Explanation:

Definitions
Overall efficiency η_overall = Shaft power / Hydraulic power from head = P_shaft ÷ (ρ g Q H).Hydraulic efficiency = Runner (wheel) power ÷ ρ g Q H.Mechanical efficiency = Shaft power ÷ Runner power.

Option mapping
(a) matches overall efficiency.(b) matches mechanical efficiency.(c) matches hydraulic efficiency.

Final Answer
Power produced by the turbine ÷ energy actually supplied by the turbine (ρ g Q H).

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Overall efficiency of a reaction turbine: choose the correct ratio Define the <strong>overall efficiency</strong> (η<sub>overall</sub>) for a reaction turbine in terms of power and available hydraulic energy. Choose the correct expression.

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