Engineering Thermodynamics
A diathermic wall is one which

Discourages thermal interaction
Encourages thermal interaction
Prevents thermal interaction
Permits thermal interaction

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Engineering Thermodynamics
Carbonization of coal consists of

Drying and crushing the coal to a fine powder
Moulding the finely ground coal under pressure with or without a binding material
None of these
Heating the wood with a limited supply of air to temperature not less than 280°C

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