Engineering Thermodynamics
In an isothermal process

There is no change in internal energy
All of the listed here
There is no change in enthalpy
There is no change in temperature

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

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
All of these

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