No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible .
Why is a machine never 100 percent efficient?
A machine cannot be 100 percent efficient because output of a machine is always less than input . A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.
Are machines 100 percent efficient?
A simple machine, such as a lever, pulley, or gear train, is “ideal” if the power input is equal to the power output of the device, which means there are no losses. In this case, the mechanical efficiency is 100%.
Is Carnot engine 100 efficient?
In order to achieve 100% efficiency (η=1), Q 2 must be equal to 0 which means that all the heat form the source is converted to work. The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity.
Can a perfectly efficient system ever be created?
The fact is, you can’t make a super-efficient system without any waste . No matter how good of an engineer you are, you can’t invent a perfect engine. ... Simply put, a heat engine is a machine or system that converts heat into other forms of energy.
How can we increase the efficiency of a machine?
For a lever, you can increase the machine’s efficiency by reducing the friction .
What is the most efficient machine?
“ The bicycle is the most efficient machine ever created. Converting calories into gas, a bicycle gets the equivalent of 3,000 miles per gallon.” —Bill Strickland Chart by Kirkpatrick Sale ranks energy efficiency from low end (mouse, plane, car) to supreme (human on bicycle).
What is mean by efficiency of a machine is 80%?
Efficiency of a machine is 80% this means that the total energy produced to the machine only 80% is useful and given as a output.
Why Carnot engine is not possible?
In real engines, the heat transfers at a sudden change in temperature whereas in a Carnot engine, the temperature remains constant . In our day to day lives, reversible processes can’t be carried out and there is no such engine with 100 % efficiency. Thus, the Carnot cycle is practically not possible.
Why Carnot engine is most efficient?
The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature .
Which is the most efficient cycle?
The most efficient heat engine cycle is the Carnot cycle, consisting of two isothermal processes and two adiabatic processes. The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws.
Is there a real perpetual motion machine?
Apparent perpetual motion machines. As “perpetual motion” can exist only in isolated systems, and true isolated systems do not exist, there are not any real “perpetual motion” devices .
Why is there no perpetual motion machine?
The first law of thermodynamics is the law of conservation of energy. It states that energy is always conserved. ... To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this fact alone, it is impossible to build perpetual motion machines .
Why is a perfect heat engine Impossible?
It is impossible to construct a perfect heat engine. ... Since it absorbs heat, its entropy is increased . If it increases its entropy enough, it will ensure that the entire system has a net increase in entropy.
What should be done to make simple machine more efficient?
Answer: Friction is the main factor which reduces the efficiency of a simple machine. Efficiency of a simple machine can be increased by reducing the friction. But oiling and greasing the machine is a useful way to increase the efficiency of a machine.
What are the two ways to increase efficiency?
- Don’t be afraid to delegate. ...
- Match tasks to skills. ...
- Communicate effectively. ...
- Keep goals clear and focused. ...
- Incentivize employees. ...
- Cut out the excess. ...
- Train and develop employees. ...
- Embrace telecommuting.
