Engineering Thermodynamics
The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

Heat rejected
Either heat absorbed or heat rejected
None of the listed here
Heat absorbed

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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
None of these
Moulding the finely ground coal under pressure with or without a binding material
Drying and crushing the coal to a fine powder

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