Question

Efficiency of Carnot engine is $100\%$ if

• A. $T_2=273K$
• B. $T_2=0K$
• C. $T_1=273K$
• D. $T_1=0K$

Answer 1

Answer: (B)

$\eta =1-\frac{T_2}{T_1}$ for $100\%$ efficiency $\eta =1$ which gives $T_2=0K$