Question

A carnote’s engine is made to work between 200°C and 0°C first and then between 0°C and minus 200°C. Compare the values of efficiencies in the two cases.

Answer 1

Case -1:

= 1 – 0.577 = 0.42 = 42% 

Case – 2: 

η = 1 – \(\frac{73}{473}\)

T₂ = -200 = 73k 

= 1 – 0.26 

= 0.73 

= 73% 

T₁ = 0 = 273k