Engineering Thermodynamics
Which of the following is the correct statement?

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.
Irreversible engines have maximum 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 proportional to its specific weight
Occupies volume inversely proportional to its specific weight
Occupies volume inversely proportional to its molecular weight
Occupies same volume

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
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

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