Engineering Thermodynamics
Coke is produced

By heating wood with a limited supply of air to a temperature not less than 280°C
From the finely ground coal by moulding under pressure with or without a binding material
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
When coal is first dried and then crushed to a fine powder by pulverizing machine

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When beat is being rejected, temperature of cold source and working substance should be same
When heat is being absorbed, temperature of hot source and working substance should be same
All of these
Free expansion or friction resisted expansion/compression process should not be encountered

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