Engineering Thermodynamics
For same compression ratio and for same heat added

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

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Engineering Thermodynamics
Otto cycle consists of

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

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