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Question

The efficiency of an ideal heat engine working between 300 K and 400 K is
  1. 10%
  2. 75%
  3. 25%
  4. 90%


Solution

The correct option is C 25%
For ideal heat engine efficiency

(%)η=(1T2T1)×100

T2=300K,T2=400Kη=(1T2T1)×100η=(1300400)×100=25%

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