Engineering Thermodynamics
Producer gas is obtained by

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

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Engineering Thermodynamics
Otto cycle consists of

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

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