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

Hyperbolic process
Heat exchange process
Throttling process
Isentropic process

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Engineering Thermodynamics
An open system is one in which

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

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