Engineering Thermodynamics
Carnot cycle efficiency is maximum when

Final temperature is 0°K
Initial temperature is 0°K
Difference between initial and final temperature is 0°K
Final temperature is 0°C

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Engineering Thermodynamics
Producer gas is obtained by

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

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