Engineering Thermodynamics
The condition for the reversibility of a cycle is

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
The working parts of the engine must be friction free

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume inversely proportional to its molecular weight
Occupies volume proportional to its specific weight
Occupies volume inversely proportional to its specific weight
Occupies same volume

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