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The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will decrease.

The combustion in spark ignition engine is homogeneous while the combustion in compression ignition engine is heterogeneous.

The Ericsson cycle consists of two isothermal and two constant pressure processes while the Stirling cycle consists of two isothermal and two constant volume processes.

The mean effective pressure of an Otto Cycle is directly proportional to its compression ratio, so it increases with an increase in compression ratio.

In Otto cycle, heat addition takes place at constant volume.

The efficiency of an Otto cycle is increased by increasing compression ratio.

Work output of an ideal Otto cycle increase with the increase in

pressure ratio (rp),
compression ratio
adiabatic index (?).

The thermal efficiency of theoretical Otto cycle does not depends upon the pressure ratio.

In a carnot cycle the working medium receives heat at a higher temperature and rejects heat at a lower temperature.

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