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

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

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with conversion of mass and energy
Deals with reversibility and irreversibility of process
Deals with heat engines
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All the processes, taking place in the cycle of operation, must be extremely slow
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 of these

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