Engineering Thermodynamics
According to First law of thermodynamics,

Work-done by a system is equal to the heat transferred by the system
Internal energy, enthalpy and entropy during a process remain constant
Total internal energy of a system during a process remains constant
Total energy of a system remains constant

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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 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
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

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