Engineering Thermodynamics
Gases have

Two values of specific heat
Only one value of specific heat
No value of specific heat
Under some conditions one value and sometimes two values of specific heat

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Engineering Thermodynamics
Carbonization of coal consists of

Drying and crushing the coal to a fine powder
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

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