Engineering Thermodynamics
For same compression ratio and for same heat added

Both Otto and Diesel cycles are equally efficient
Efficiency depends on other factors
Otto cycle is more efficient than Diesel cycle
Diesel cycle is more efficient than Otto cycle

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Engineering Thermodynamics
Producer gas is obtained by

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

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