Question

For which combination of working temperatures, the efficiency of Carnot's engine is the least ?

• A. 60 K, 40 K
• B. 40 K, 20 K
• C. 80 K, 60 K
• D. 100 K, 80 K

Answer 1

Answer: (D)

100 K, 80 K

Answer 2

We know that,
$\eta=\left(1-\frac{T_{L}}{T_{H}}\right) \times 100$
According to trial and error method.
$\eta=\left(1-\frac{80}{100}\right) \times 100$