Mechanical Engineering - Thermodynamics - Discussion
Discussion Forum : Thermodynamics - Section 6 (Q.No. 33)
33.
A machine which violates the first law of thermodynamics is known as perpetual motion machine of the second kind.
Discussion:
4 comments Page 1 of 1.
Archana said:
9 years ago
I think it is Second law.
Kukku said:
9 years ago
There are two types of perpetual motion machines:
- Perpetual motion machines of the first kind are those devices that violate the first law of thermodynamics, the principle of conservation of energy, creating energy out of nothing.
- Most attempts fall into this category.
- Perpetual motion machines of the second kind are devices that violate the second law of thermodynamics.
- Even though they obey the principle of conservation of energy, they attempt an extraction of work from a single heat reservoir, violating the principle of no entropy decrease in an isolated macroscopic thermodynamic system.
- Perpetual motion machines of the first kind are those devices that violate the first law of thermodynamics, the principle of conservation of energy, creating energy out of nothing.
- Most attempts fall into this category.
- Perpetual motion machines of the second kind are devices that violate the second law of thermodynamics.
- Even though they obey the principle of conservation of energy, they attempt an extraction of work from a single heat reservoir, violating the principle of no entropy decrease in an isolated macroscopic thermodynamic system.
Vinu said:
1 decade ago
It is called PMM1.
Swapnil said:
1 decade ago
A machine which violates the first law of thermodynamics is known as perpetual motion machine of the first kind.
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