Q 11-11-092JEE MainJEE Main 2023 (12 Apr, Shift 1)Easy
An engine operating between the boiling and freezing points of water will have
A. Efficiency more than $27\%$.
B. Efficiency less than the efficiency of a Carnot engine operating between the same two temperatures.
C. Efficiency equal to $27\%$.
D. Efficiency less than $27\%$.
Choose the correct answer from the options given below:
Answer: (C) B and D only
Carnot efficiency $=1-\dfrac{273}{373}\approx26.8\%$. A real engine is less efficient than a Carnot engine, so its efficiency is below $27\%$: B and D.
Solution by Sreeraj P, M.Sc Physics