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In which of the following pairs of cycles isothermal process?

1. Diesel cycle and Otto cycle
2. Carnot cycle and Stirling cycle
3. Brayton cycle and Rankine cycle
4. Bell-Coleman cycle and Vapour compression refrigeration cycle

Correct answer: Carnot cycle and Stirling cycle

Solution

The Carnot cycle and Stirling cycle both involve isothermal processes where heat is absorbed and released at constant temperatures, making them idealized cycles for studying thermodynamic efficiency.

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