Engineering Thermodynamics
Otto cycle consists of

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

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Engineering Thermodynamics
Carbonization of coal consists of

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
None of these

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Engineering Thermodynamics
An open system is one in which

Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so

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