Engineering Thermodynamics
Kelvin Planck's law deals with

Conversion of heat into work
Conservation of heat
Conversion of work into heat
Conservation of work

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Engineering Thermodynamics
Producer gas is obtained by

Carbonization of bituminous coal
Passing steam over incandescent coke
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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