Engineering Thermodynamics
Stirling cycle consists of

Two constant volume and two isentropic processes
Two constant pressure and two isothermal processes
Two constant volume and two isothermal processes
One constant volume, one constant pressure and two isentropic processes

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Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.
Irreversible engines have maximum efficiency.
All the reversible engines have the same efficiency.

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