Engineering Thermodynamics
Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

1/173th
1/27th
1/273th
1/93th

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Engineering Thermodynamics
Carbonization of coal consists of

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