Engineering Thermodynamics
A definite area or a space where some thermodynamic process takes place is known as

Thermodynamic process
Thermodynamic law
Thermodynamic cycle
Thermodynamic system

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All the processes, taking place in the cycle of operation, must be extremely slow
All of these
The working parts of the engine must be friction free
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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