An internally reversible heat engine has a thermal efficiency of 60 percent, with 600 kJ/cycle of heat transfer added at a temperature of 447 C. Calculate
a. The heat-rejection temperature, in degrees Celsius, and
b. The heat transfer rejected, in kJ/cycle.
For the same values of QH and TH, if an irreversible heat engine rejects 420 kJ/cycle,
c. Find its thermal efficiency.