Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
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
All of these

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Engineering Thermodynamics
Extensive property of a system is one whose value

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

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