Engineering Thermodynamics
An adiabatic process is one in which

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

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Engineering Thermodynamics
Carbonization of coal consists of

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

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