Engineering Thermodynamics
Carnot cycle consists of

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

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Engineering Thermodynamics
Carbonization of coal consists of

None of these
Moulding the finely ground coal under pressure with or without a binding material
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

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