Engineering Thermodynamics
Carbonization of coal consists of

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
All the processes, taking place in the cycle of operation, must be extremely slow
All of these

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