Question

The efficiency of a heat engine if the temperature of sources ${227}^{\circ }C$ and that of sink is ${27}^{\circ }C$ nearly

• A. $0.4$
• B. $0.5$
• C. $0.6$
• D. $0.7$

Answer 1

The correct option is A $0.4$

Given,

$T_1={227}^{0}C=227+273=500K$

$T_2={27}^{0}C=27+273=300K$

The efficiency of a heat engine,

$\eta =1-\frac{T_2}{T_1}$

$\eta =1-\frac{300}{500}$

$\eta =1-0.6$

$\eta =0.4$

The correct option is A.