Engineering Thermodynamics
The more effective way of increasing efficiency of Carnot engine is to

Increase higher temperature
Decrease lower temperature
Increase lower temperature
Decrease higher temperature

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Engineering Thermodynamics
An open 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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