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

All of these
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
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source

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Engineering Thermodynamics
Carbonization of coal consists of

Drying and crushing the coal to a fine powder
None of these
Heating the wood with a limited supply of air to temperature not less than 280°C
Moulding the finely ground coal under pressure with or without a binding material

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