Engineering Thermodynamics
Otto cycle consists of

Two constant volume and two isentropic processes
Two constant volume and two isothermal processes
Two constant pressure and two isentropic processes
One constant pressure, one constant volume and two isentropic processes

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Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

A Rankine cycle receives heat at two places
Carnot cycle can't work with saturated steam
Heat is supplied to water at temperature below the maximum temperature of the cycle
Rankine cycle is hypothetical

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