Engineering Thermodynamics
A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

None of these
Irreversible cycle
Reversible cycle
Thermodynamic cycle

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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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