Question

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) \(\frac{mechanical \, efficiency}{actual \, thermal \, efficiency} \)

The question was asked during an interview for a job.

My enquiry is from I.C Engine topic in chapter Internal Combustion Engine of Farm Machinery

Answer 1

The correct choice is (b) \(\frac{actual \, thermal \, efficiency}{air-standard \, efficiency} \)

Explanation: Relative efficiency is the ratio of actual thermal efficiency to the air-standard efficiency.

Relative efficiency = \(\frac{actual \, thermal \, efficiency}{air-standard \, efficiency} \)