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

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

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

Free expansion or friction resisted expansion/compression process should not be encountered
When heat is being absorbed, temperature of hot source and working substance should be same
All of these
When beat is being rejected, temperature of cold source and working substance should be same

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

All of these
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy

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