Engineering Thermodynamics
Boyle's law i.e. pV = constant is applicable to gases under

Only small range of pressures
All ranges of pressures
Steady change of pressures
High range of pressures

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Engineering Thermodynamics
Otto cycle consists of

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

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