Engineering Thermodynamics
According to Avogadro's Hypothesis

The sum of partial pressure of mixture of two gases is sum of the two
The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
Gases have two values of specific heat
Product of the gas constant and the molecular weight of an ideal gas is constant

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Engineering Thermodynamics
Otto cycle consists of

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

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