Question:medium

A Carnot engine is operating between a hot body and cold body maintained at temperatures \( T_1 \) and \( T_2 \) respectively. Consider the following three cases:
• Case-I: The temperature of the hot body is changed to \( T_1 + \Delta T \) and cold body is at \( T_2 \).
• Case-II: The temperature of the hot body is at \( T_1 \) and cold body is changed to \( T_2 + \Delta T \).
• Case-III: The temperature of the hot body is at \( T_1 \) and cold body is changed to \( T_2 - \Delta T \). The efficiency of the Carnot cycle is highest for:

Show Hint

Lowering cold reservoir temperature increases efficiency more effectively than raising hot temperature.
Updated On: May 1, 2026
  • The efficiency of the Carnot cycle is highest for case-I
  • The efficiency of the Carnot cycle is highest for case-II
  • The efficiency of the Carnot cycle is highest for case-III
  • The efficiency of case-II is higher than case-III
  • The efficiency of the Carnot cycle is same for all three cases
Show Solution

The Correct Option is C

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