Engineering Thermodynamics
A perpetual motion machine is

A hypothetical machine
A non-thermodynamic machine
A hypothetical machine whose operation would violate the laws of thermodynamics
A thermodynamic machine

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

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

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