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AP EAMCET2013PhysicsThermodynamics

Efficiency of a heat engine whose sink is at temperature of 300 ~K is 40 % . To increase the efficiency to 60 % , keeping the sink temperature constant, the source temperature must be increased by

Options

  1. A750 ~K
  2. B500 ~K
  3. C250 ~K
  4. D1000 ~K

Correct answer

C. 250 ~K

Step-by-step solution

array ll T₂ T₁ =1- =1- 40 100 = 3 5 & T₁= 5 3 T₂ & T₁= 5 3 300=500 ~K array New efficiency ^ =60 % aligned & T₂ T₁^ =1- ^ =1- 60 100 = 2 5 & T₁^ = 5 2 300=750 ~K aligned

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