For a Carnot engine initially operating between absolute temperatures \(T_1\gt T_2\gt 0\), compare equal small absolute temperature changes from the same initial state. Which change increases efficiency more?
Decrease T2, keeping T1 constant
Carnot efficiency is \(\eta=1-T_2/T_1\). For the same small positive temperature change \(\delta T\), raising the source gives \(\Delta\eta\approx(T_2/T_1^2)\delta T\), whereas lowering the sink gives \(\Delta\eta=\delta T/T_1\). Because \(T_1\gt T_2\gt 0\), the latter increase is larger.
Important Questions from Statements of Second Law of Thermodynamics
Which law of thermodynamics assigns a quality to different form of energy, and also indicates the direction of any spontaneous process?
The heat flows from a cold body to a hot body with aid of an external source. The statement is given by
- The direction of the natural process is defined by ______.
Identify the correct option with respect to the second law of thermodynamics.
I) It gives the concept of temperature
II) It gives the concept of internal energy
III) it gives the concept of entropy
Which of following is true with respect to PMM2?
