Engineering Thermodynamics
Coke is produced

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

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Engineering Thermodynamics
Otto cycle consists of

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

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