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In which process does a thermodynamic system remains infinitesimally closed to an equilibrium state at all times?

(a) Path equilibrium process

(b) Cycle equilibrium process

(c) Phase equilibrium process

(d) Quasi-state or quasi-equilibrium process

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This question is from Single Variable Problems topic in chapter Single Variable Problems of Finite Element Method

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Right choice is (d) Quasi-state or quasi-equilibrium process

The explanation is: Quasi-static Process, in thermodynamics, is a process that happens infinitely slowly. However, it is very important to note that no real process is Quasistatic. A Quasistatic process ensures that the system will go through a sequence of states that are infinitesimally close to equilibrium.

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