Engineering Thermodynamics
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Heat rejection is lower
Combustion is at constant volume
Expansion and compression are isentropic
Maximum temperature is higher

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Engineering Thermodynamics
Gases have

Only one value of specific heat
Two values of specific heat
No value of specific heat
Under some conditions one value and sometimes two values of specific heat

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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
Carbonization of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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