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Question:

Carnot engine, whose efficiency is 40%

1200K

750K

600K

Efficiency of carnot engine cannot be made larger than 50%

Solution:

For the 1st case, Efficiency = η = (1 - T1/T2) × 100
40 = (1 - T1/500) × 100
T1 = 300K
For the 2nd case,
η = (1 - T1/T2) × 100 = 60
T2 = 750K