What is PMM1 in thermodynamics?

What is PMM1 in thermodynamics?

Perpetual motion machine of the first kind (PMM1): The first law of thermodynamics states that energy can neither be created nor be destroyed. It can only get transformed from one form to another form.

Why is PMM1 impossible?

A perpetual motion machine 1 violates the law by creating energy. All processes in universe comply with first and second law of thermodynamics. Therefore PPM1 does not and can never exist. e.g: An electric heater that consumes 1KW of electricity cannot produce more than 1KW heat.

What is PMM1 how it violates first law of thermodynamics?

ANSWER: Perpetual Motion Machine of the First kind (PMM1) The first law of thermodynamics states that the energy can neither be created nor be destroyed. It can only gets transformed from one form to another form. Perpetual Motion Machine is the machine which violates the law of thermodynamics.

What is PMM1 and PMM2 and why it is impossible?

Perpetual Motion Machine (PMM) of the First Kind (PMM1) would be one to violate the 1st Law of Thermodynamics, to permanently produce useful energy (work) without any energy source, or to produce more ‘energy’ than consumed (thus generate energy from nowhere); and Perpetual Motion Machine of the Second Kind (PMM2) …

What is the efficiency of PMM1?

Heat engine with 100% thermal efficiency obeys the first law of thermodynamics which is law of conservation of energy but it violates the Kelvin-planck statement of second law of thermodynamics. Thus heat engine with 100% thermal efficiency is a PMM2.

Why is PMM2 impossible?

ANSWER: perpetual motion machine of second kind (PMM2) This is due to that some heat has to be rejected to sink. Therefore this heat engine violates the Kelvin-Planck statement of second law of thermodynamics. Hence it will be a perpetual motion machine of second kind (PMM2). PMM2 is impossible to produce.

What are the limitations of first law of thermodynamics?

The limitation of the first law of thermodynamics is that it does not say anything about the direction of flow of heat. It does not say anything whether the process is a spontaneous process or not. The reverse process is not possible. In actual practice, the heat doesn’t convert completely into work.

What is true for PMM1?

Explanation: PMM1 is the machine which violates the first law of thermodynamics that the energy can neither be created nor be destroyed. Therefore total energy of the universe is constant.

What is principle of increase of entropy?

Thus the Increase in Entropy Principle states that for any process the total change in entropy of a system together with its enclosing adiabatic surroundings is always greater than or equal to zero.

What are the limitations of the 1st law of thermodynamics and how have they been overcome by the 2nd law?

The first law places no restriction on direction. A process will not occur unless it satisfies. To overcome this limitations, anotherlaw is needed which is known as second law of thermodynamics.

How does entropy affect efficiency?

Any heat engine operating between the same two temperatures whose efficiency is less than eC necessarily increases the entropy of the universe; in particular, the total entropy of the reservoirs must increase. This increase in entropy of the reservoirs is called entropy generation.