Engineering Thermodynamics
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

Absolute temperature, if volume is kept constant
Temperature
Volume, if temperature is kept constant
None of these

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Engineering Thermodynamics
Producer gas is obtained by

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
Passing steam over incandescent coke

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