Engineering Thermodynamics
Which of the following is the correct statement?

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

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume inversely proportional to its molecular weight
Occupies same volume
Occupies volume inversely proportional to its specific weight
Occupies volume proportional to its specific weight

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