Question

The source and sink temperature of a Carnot engine are 400K and 300K respectively. What is the efficiency?

• A. 100%
• B. 75%
• C. 33.3%
• D. 25%

Answer 1

The correct option is D 25%

It is given that T = 400 K and t = 300 K
These are the temperatures of source and sink respectively.
The efficiency of the cycle is,
$\eta =1-\frac{t}{T}$
$\eta =1-0.75=0.25$
Thus the efficiency is 25 %