Engineering Thermodynamics
Otto cycle consists of following four processes

Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
Two isentropic and two constant volumes
Two isothermal and two isentropic

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Engineering Thermodynamics
Carbonization of coal consists of

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

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