Formula for brake efficiency of turbine in vapour power cycle - Thermodynamics

Q.  What is the correct formula for brake efficiency of the turbine in vapour power cycle?
Where out flow is as following,Ideal output(Actual work given to turbine) ----> Internal losses ----> Internal output (Actual work produced by turbine turbine) ----> External losses -----> Brake output (Actual work at the shaft)

- Published on 21 Aug 15

a. ηBrake = Brake output / Ideal output
b. ηBrake = Brake output / Internal output
c. ηBrake = Ideal output / Brake output
d. ηBrake = Internal output / Brake output

ANSWER: ηBrake = Brake output / Ideal output

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