Engineering Thermodynamics
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

Feasible
Possible, but with lot of sophistications
Impossible
Possible

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Engineering Thermodynamics
Producer gas is obtained by

Passing steam over incandescent coke
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

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