Engineering Thermodynamics
Addition of heat at constant pressure to a gas results in

Raising its temperature
Raising its temperature and doing external work
Raising its pressure
Raising its volume

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Engineering Thermodynamics
Producer gas is obtained by

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

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