Thermodynamics Question 163

Question: A Carnot’s engine is made to work between 200°C and 0°C first and then between 0°C and ‘200°C. The ratio of efficiencies of the engine in the two cases is

[KCET 2002]

Options:

A) 1.73 : 1

B) 1 : 1.73

C) 1 : 1

D) 1 : 2

Show Answer

Answer:

Correct Answer: B

Solution:

In first case η1=1T2T1=1(273+0)(273+200)=200473

In second case η2=1(273200)(273+0)=200273

Therefore η1η2=1(473273)=1:1.73



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