Engineering Thermodynamics
In a free expansion process

Work done is zero
Work done is zero but heat increases
Both (A) and (B) above
Heat transfer is zero

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

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