Engineering Thermodynamics
The isothermal and adiabatic processes are regarded as

Reversible process
Irreversible process
None of the listed here
Reversible or irreversible process

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Engineering Thermodynamics
A closed system is one in which

Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system

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