Engineering Thermodynamics
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

Adiabatic process
Hyperbolic process
Isothermal process
Polytropic process

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

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