Question

A heat engine absorbs 760 kJ heat from a source at 380kK . It rejects (1) 650 kJ, (ii) 560 kJ, (iii) 504 kJ of heat to sink at 280 K . State which of these represent a reversible , an irreversible and an impossible cycle .

Answer 1

Correct Answer - (i) irreversible, (ii) reversible (iii) impossible
`eta= 1 - (T_(L))/(T_(H)) = 26.31 %`
`eta_("rev")gteta_("irr")`
(i) `eta_(1)=(q_(H)-q_(L))/(q_(H))=14%" "("Irreversible")`
(ii) `underset("Reversible")(eta_(2)= 26.31 %)`
(iii) `underset("impossible")(eta_(3)= 33.68 %)`