Question

The efficiency of Carnot's engine operating between reservoirs, maintained at temperature 27° C and – 123° C is 

(A) 0.5 

(B) 0.4 

(C) 0.6 

(D) 0.25

Answer 1

Correct option: (A) 0.5

Explanation:

T₁­ = 27 + 273 = 300 K

T₂ = – 123 + 273 = 150 K

η = 1 – (T₂ / T₁) – efficiency of carnot’s engine

∴  η = 1 – {(150) / (300)}

η = (1/2)