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

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

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
All of these
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source

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