6.27 A Carnot engine operates between a source temperature 500 °C and a sink temperature 20 °C. The work done
by the engine in one cycle is 1000 kJ. Calculate
(a) the thermal efficiency,
(b) the heat supplied to the engme
in one cycle (kJ),
(c) the heat rejected by the engine in one cycle (kJ),
(d) the entropy change of the englne
during the heat rejection process (kJ/ K).