Engineering Thermodynamics
The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

Either heat absorbed or heat rejected
None of the listed here
Heat rejected
Heat absorbed

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Engineering Thermodynamics
A closed system is one in which

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
Mass does not cross boundaries of the system, though energy may do so

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