Question

what is carnot cycle. does its efficiency depend on working substance?

Answer 1

A Carnot heat engine is a hypothetical heat engine which works on the basis of reversible Carnot cycle. It is assumed as the most efficient heat cycle and it consists of two isothermal and two adiabatic processes.
The Carnot cycle consists of the following steps:
1-Reversible isothermal expansion of the gas at the high temperature.
2-Reversible adiabatic expansion of the gas.
3- Reversible isothermal compression of the gas at the lower temperature.
4-Reversible adiabatic compression of the gas.
No,
The efficiency of a carnot cycle does not depend on the working substance and depends only on temperature.