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Which one is not a limitation of the Carnot cycle with air or gas as refrigerant?

Which one is not a limitation of the Carnot cycle with air or gas as refrigerant? Correct Answer It has low efficiency when working between two fixed temperature limits

Carnot cycle has the highest efficiency theoretically when working between two fixed temperature limits. Other limitations of Carnot cycle are machine has to run at high and low speeds during adiabatic and isothermal process. Such variation of speed is not possible, extreme pressure and large volume is developed, it is not possible to carry out isothermal heat transfer process in practice.

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