Engineering Thermodynamics
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

Absolute temperature, if volume is kept constant
None of these
Volume, if temperature is kept constant
Temperature

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Engineering Thermodynamics
Carbonization of coal consists of

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

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