Direction: In two air standard cycles - one operating in the Otto and the other on the Brayton cycle - air is isentropically compressed from 300 to 450 K. Heat is added to raise the temperature to 600 K in the Otto cycle and to 550 K in the Brayton cycle.
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In η0 and ηb are the efficiencies of the Otto and Brayton cycles, then
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- η0 = 0.25,ηb = 0.18
- η0 = ηb = 0.33
- η0 = 0.5, ηb= 0.45
- it is not possible to calculate the efficiencies unless the temperature after the expansion is given
Correct Option: B
| η0 = η0 = 1 - | = 1 - | = 1.3 | ||
| T2 | 450 |
| = | = 0.333 | 450 |
[ ηB = η0 = 33.3% ]
