Question

In Carnot engine, efficiency is 40% at hot reservoir temperature T. For efficiency 50%, what will be the temperalure of hot reservoir?

(a) 2T/5

(b) 6T

(c) 6T/5

(d) T/5

Answer 1

Correct option (c) 6T/5  

Explanation:

We know that,

where, 

T₂ = temperature of sink and 

T₁ = temperature of hot reservoir 

Efficiency is 40% at hot reservoir temperature T

Let at temperature ' T₁ efficiency becomes 50%