Engineering Thermodynamics
A heat exchange process in which the product of pressure and volume remains constant is known as

Heat exchange process
Throttling process
Isentropic process
Hyperbolic process

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Engineering Thermodynamics
An open system is one in which

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

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