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)

$T_{2} = 0K$

Answer 2

$\eta = 1 - \frac{T_{2}}{T_{1}}$ for 100% efficiency η = 1 which gives

T₂ = 0 K.