Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When beat is being rejected, temperature of cold source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered
All of these
When heat is being absorbed, temperature of hot source and working substance should be same

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Engineering Thermodynamics
According to Avogadro's Hypothesis

Product of the gas constant and the molecular weight of an ideal gas is constant
Gases have two values of specific heat
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

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Engineering Thermodynamics
Intensive property of a system is one whose value

Is not dependent on the path followed but on the state
Depends on the mass of the system, like volume
Is dependent on the path followed and not on the state
Does not depend on the mass of the system, like temperature, pressure, etc.

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