Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

All the heat engines are based on Carnot cycle
It is used as the alternate standard of comparison of all heat engines
It provides concept of maximising work output between the two temperature limits
All of these

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Engineering Thermodynamics
A closed system is one in which

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

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