Engineering Thermodynamics
The condition for the reversibility of a cycle is

The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
The working parts of the engine must be friction free
All the processes, taking place in the cycle of operation, must be extremely slow
All of these

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Engineering Thermodynamics
Gases have

No value of specific heat
Two values of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat

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