Engineering Thermodynamics
An adiabatic process is one in which

All of these
The change in internal energy is equal to the mechanical work done
No heat enters or leaves the gas
The temperature of the gas changes

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Engineering Thermodynamics
Carbonization of coal consists of

Drying and crushing the coal to a fine powder
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
None of these

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