Question 590: Thermodynamics & KTG

Question

300 cal. of heat is given to a heat engine and it rejects 225 cal. If source temperature is 227$$^\circ$$C, then the temperature of sink will be ______________ $$^\circ$$C.

Accepted Answer

$$\eta  = {W \over Q} = {{300 - 225} \over {300}}$$
$$ \Rightarrow {{75} \over {300}} = 1 - {{{T_L}} \over {{T_H}}}$$
$$ \Rightarrow {T_L} = {3 \over 4}\,{T_H} = {3 \over 4}(500) = 375\,K$$
$$ \Rightarrow {T_L} = 102^\circ C$$

Thermodynamics & KTG

300 cal. of heat is given to a heat engine and it rejects 225 cal. If source temperature is 227$^\circC, then the temperature of sink will be ______________ ^\circ$C.

Choose the correct answer: