KcetHeat And ThermodynamicsKCET 2017MCQ+1 / -02017For which combination of working temperatures, the efficiency of Carnot's engine is the least?A$100 \mathrm{~K}, 80 \mathrm{~K}$B $40 \mathrm{~K}, 20 \mathrm{~K}$C$80 \mathrm{~K}, 60 \mathrm{~K}$D $60 \mathrm{~K}, 40 \mathrm{~K}$Check AnswerClear SelectionReveal AnswerShow Explanation