Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Atomic mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the gas constant

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

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Engineering Thermodynamics
Which of the following is the correct statement?

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

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