Question

The temperature of sink of Carnot’s engine is 27°C. If the efficiency of the engine is 25%, then the temperature of source must be ___________

(a) 27°C

(b) 127°C

(c) 227°C

(d) 327°C

I had been asked this question in an online quiz.

I need to ask this question from Thermodynamics in division Kinetic Theory of Gases of Engineering Physics I

Answer 1

Correct option is (b) 127°C

The explanation: Ƞ=1 – T2/T1

0.25=1 – (273+27)/T1

T1=300/0.75=400K=127℃.