Engineering Thermodynamics
Carnot cycle efficiency is maximum when

Final temperature is 0°K
Initial temperature is 0°K
Difference between initial and final temperature is 0°K
Final temperature is 0°C

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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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