Engineering Thermodynamics
Producer gas is obtained by

Passing steam over incandescent coke
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
Carbonization of bituminous coal

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Engineering Thermodynamics
Gases have

No value of specific heat
Two values of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat

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