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

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
The working parts of the engine must be friction free
All the processes, taking place in the cycle of operation, must be extremely slow
All of these

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