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Relative efficiency is the ratio of _________

a) \(\frac{actual \, thermal \, efficiency}{mechanical \, efficiency} \)
b) \(\frac{actual \, thermal \, efficiency}{air-standard \, efficiency} \)
c) \(\frac{air-standard \, efficiency}{actual \, thermal \, efficiency} \)
d) \(\frac{mechanical \, efficiency}{actual \, thermal \, efficiency} \)

Answer: b
Explanation: Relative efficiency is the ratio of actual thermal efficiency to the air-standard efficiency.
Relative efficiency = \(\frac{actual \, thermal \, efficiency}{air-standard \, efficiency} \)

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