Engineering Thermodynamics
A perpetual motion machine is

A non-thermodynamic machine
A thermodynamic machine
A hypothetical machine
A hypothetical machine whose operation would violate the laws of thermodynamics

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Engineering Thermodynamics
Producer gas is obtained by

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
Carbonization of bituminous coal
Passing steam over incandescent coke

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