GATE ME 2019 Set 1 — Question 60
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Question
A gas turbine with air as the working fluid has an isentropic efficiency of 0.70 when operating at a pressure ratio of 3. Now, the pressure ratio of the turbine is increased to 5, while maintaining the same inlet conditions. Assume air as a perfect gas with specific heat ratio . If the specific work output remains the same for both the cases, the isentropic efficiency of the turbine at the pressure ratio of 5 is ________ (round off to two decimal places)
Correct answer
0.5 to 0.52
Solution
The specific work output of a turbine is given by:Given that the specific work output remains the same for both cases:Rounding off to two decimal places, the isentropic efficiency is 0.51.
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