Engineering Thermodynamics
An adiabatic wall is one which

Encourages thermal interaction
Prevents thermal interaction
Discourages thermal interaction
Permits thermal interaction

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Engineering Thermodynamics
Otto cycle consists of

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

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