Engineering Thermodynamics
In an isothermal process, the internal energy of gas molecules

Increases
Decreases
Remain constant
May increase/decrease depending on the properties of gas

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Engineering Thermodynamics
Carnot cycle consists of

Two constant volume and two isentropic processes
Two isothermal and two isentropic processes
Two constant pressure and two isentropic processes
One constant volume, one constant pressure and two isentropic processes

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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 specific heat at constant pressure
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

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