Question

Which of the following is true for performance parameters of vapour power cycles?
1. Work ratio = 2 + Back work ratio
2. Work ratio = Back work ratio
3. Work ratio = 1 – Back work ratio
4. Work ratio = 1 + Back work ratio

Answer 1

Correct Answer - Option 3 : Work ratio = 1 – Back work ratio

Explanation:

\(Back\;work\;ratio = \frac{{Negative\;work}}{{Possitive\;work}} = \frac{{{W_C}}}{{{W_T}}}\)

where W_C = work done in the compressor and W_T = work done by turbine

\(Work\;Ratio=\frac{{Net\;work}}{{Possitive\;work}}=\frac{{{W_T} - {W_c}}}{{{W_T}}} = 1 - \frac{{{W_C}}}{{{W_T}}}\)

∴ 1 – Back work ratio