Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
All of these
All the processes, taking place in the cycle of operation, must be extremely slow
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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Engineering Thermodynamics
According to Avogadro's Hypothesis

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
The sum of partial pressure of mixture of two gases is sum of the two

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