Engineering Thermodynamics
Mond gas is obtained by

Carbonisation of bituminous coal
Passing air and a large amount of steam over waste coal at about 650°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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Engineering Thermodynamics
Otto cycle consists of

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

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