Engineering Thermodynamics
Which of the following is the correct statement?

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

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can

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