More effective way of increasing efficiency of Carnot engine where T1 is source and T2 is the sink is:

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ISRO LPSC Technical Assistant Mechanical 4 March 2018 Official Paper
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  1. Increase T1, keeping T2 as constant 
  2. Decrease T2, keeping T1 constant
  3. Increasing efficiency is impossible
  4. None of the above

Answer (Detailed Solution Below)

Option 2 : Decrease T2, keeping T1 constant
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Detailed Solution

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Explanation:

The efficiency of the Carnot engine is given by:

From the above formula, we know that efficiency is varied by:

  • Decreasing the value of Temperature TL
  • Keeping constant the value of TH

  • The efficiency of the Carnot cycle is the function of the source and sink temperature.
  • Carnot cycle efficiency depends upon the temperature range of operation.
  • The efficiency of the Carnot engine is increased by decreasing the lower temperature and increasing the higher temperature but more effects on the efficiency of the Carnot cycle is by decreasing lower temperatures as compared to an increase in higher temperature.

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