Engineering Thermodynamics
The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

Increase
Increase/decrease depending on application
Remain unchanged
Decrease

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Engineering Thermodynamics
An open 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
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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