Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Its entropy will change due to irreversibility
Sum of heat and work transfer will be zero
Process is thermodynamically in equilibrium
Process is executed in closed system cycle

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Engineering Thermodynamics
Carbonization of coal consists of

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

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