Engineering Thermodynamics
The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

Process is isentropic
Flow is uniform and steady
Process is isothermal
Process is isentropic and specific heat does not change with temperature

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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
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system

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