The thermal efficiency of a gas turbine cycle with ideal regenerative heat exchanger is

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UPPSC AE Mechanical 2013 Official Paper II
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  1. equal to work ratio
  2. less than work ratio
  3. more than work ratio
  4. unpredictable

Answer (Detailed Solution Below)

Option 1 : equal to work ratio
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Concept:

Work ratio is defined as net work output and work done by turbine

Work ratio = 

Efficiency is defined as the ratio of net work output to the energy supplied to the cycle.

Heat added in system 

Head rejected = Cp [T4' – T1]

For ideal Regenerator

T2 = T4' and T2' = T4 

Hence, Efficiency is equal to work ratio

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