Engineering Thermodynamics
Coke is produced

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

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Engineering Thermodynamics
Stirling cycle consists of

Two constant volume and two isentropic processes
Two constant pressure and two isothermal processes
Two constant volume and two isothermal processes
One constant volume, one constant pressure and two isentropic processes

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