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

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

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Engineering Thermodynamics
Producer gas is obtained by

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

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Engineering Thermodynamics
Select the wrong statement

A Joule cycle consists of two constant volume and two isentropic processes.
An Ericsson cycle consists of two constant pressure and two isothermal processes.
All of these
An Otto cycle consists of two constant volume and two isentropic processes.

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