Engineering Thermodynamics
Otto cycle consists of

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
All the processes, taking place in the cycle of operation, must be extremely slow
All of these
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

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