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AP EAMCET202021 Sep 2020Evening ShiftPhysicsThermodynamicsActual

The efficiency of a Carnot's engine is (100 % ) only when

Options

  1. Aideal gas is used as a working substance
  2. Btemperature of the sink is equal to absolute zero
  3. Csource temperature is equal to the temperature of the sink
  4. Dsource temperature is equal to absolute zero

Correct answer

B. temperature of the sink is equal to absolute zero

Step-by-step solution

The efficiency of Carnot's engine is given as ( =1- T₂ T₁ ) ...(i) where, (T₁= ) temperature of source and (T₂= ) temperature of sink. For (100 % ) efficiency, ( =1 ) ( ) From Eq. (i), we get (1=1- T₂ T₁ T₂ T₁ =0 T₂=0 ) Hence, temperature of ( sink T₂ ) is equal to absolute zero.

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