Table of Contents
How Can Machines Be Made More Efficient?
Mechanical devices can be made more efficient through lubrication to reduce the friction between moving parts of a machine and increase the amount of useful energy transferred.
How can you increase the efficiency of a machine?
- Use VFDs on motors with variable loads.
- Power off stopped and idle machines and equipment.
- Shut off conveyors when not carrying product.
- Shut off the light when no one is working in the area.
- Control production speed to meet demand.
- Use only the required air pressure and no more.
Is it possible to make a machine completely efficient?
Most machines transfer energy from one place or another or transform one form of energy (e.g. chemical) into another (e.g. mechanical) but machines can`t create any form of energy. … That is why 100% efficiency in machines shall not be possible.
What reduces the efficiency of a machine?
The two cases to decrease the efficiency of machine are friction produced in the machine and the tightness of the parts of the machine and also heat generated by the work done by the machine.
What is the efficiency of the machine?
The efficiency of a machine is equal to the ratio of its output (resistance multiplied by the distance it is moved) to its input (effort multiplied by the distance through which it is exerted) it is also equal to the ratio of the AMA to the IMA. This does not mean that low-efficiency machines are of limited use.
What is the efficiency of a machine can a machine be 100% 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.
Why will Machines never be 100% efficient in what ways can you increase the ideal efficiency of a heat engine?
It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine shown in Figure 1 by the term.
Why is the efficiency of a machine never 100%?
The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction the efficiency of any machine is always less than 100 percent.
How Can machines be made more efficient by reducing friction?
Because all machines lose input work to friction one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient.
How could we increase the efficiency of a pulley system?
The efficiency of the pulley can increase by reducing the friction in the bearings of pulleys using lubricants. The pulleys in the lower block should be as light as possible because the efficiency is reduced due to the weight of the lower blocks of the pulley.
Why is the efficiency of a machine always less than one?
Why is the efficiency of machine always less than one? Since a machine does not contain a source of energy nor can it store energy from conservation of energy the power output of a machine can never be greater than its input so the efficiency can never be greater than 1.
Which of the following machine is more efficient?
The most efficient electrical machine is the transformer. Transformers have efficiency above 95%.
What happens to the overall efficiency of a machine as I add more machines?
What happens to the overall efficiency of a machine as I add more machines? For each simple machine you add the overall efficiency increases because it gets faster. For each simple machine you add the overall efficiency decreases. The overall efficiency is divided in half for every simple machine you add.
What is the efficiency of a simple machine?
Can a machine have an efficiency of 1?
Since a machine does not contain a source of energy nor can it store energy from conservation of energy the power output of a machine can never be greater than its input so the efficiency can never be greater than 1.
What do you mean by efficiency of a machine is 90%?
Answer: It means a simple machine can work or do its function with 90% in a good way. Or a simple machine had capacity to do 90% work.
What is the efficiency of a practical machine give reason for your answer?
Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
What force prevents a machine from having 100 efficiency?
| Question | Answer |
|---|---|
| This prevents a machine from being 100% efficient. | friction |
| For the scientific definition of work to be done what two things must happen? | force and motion must be in the same direction |
| What do you need to calculate work? | force and distance |
Why are appliances incapable of 100% efficiency in terms of power?
Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work). The output work is always less than the input work because some of the input work is used to overcome friction. Therefore efficiency is always less than 100 percent.
Why do energy sources not have 100% efficiency?
Energy sources do not have 100% efficiency because the processes of energy conversion to usable forms involves energy losses.
Is it possible to have more than 100% efficiency?
Even though the energy efficiency calculated using common methods exceeds 100% more than 100% of the theoretical energy content of the fuel expressed as the Higher Heating Value (HHV) is naturally not recovered.
When can you say that a machine is efficient?
The efficiency of a machine indicates how well its input energy is converted to useful output energy or work. It is a major factor in the usefulness of a machine and is the fraction or percentage of the output divided by the input.
Why or how does friction change the efficiency of a machine?
The friction generates heat which is an energy that should be converted in movement. That energy by the form of heat is a loss. Decreasing the friction by lubrication you will decrease the losses and increase efficiency.
How do machines make work easier?
There are three ways simple machines make work easier: by increasing the distance through which force is applied by changing the direction of applied force or by multiplying force of speed of the energy applied.
How can we increase the efficiency of block and tackle system pulley?
Answer: By redusing the weight of movable block. by minimizing the force of friction between the movable parts by applying lubricants.
What are the factors which reduces efficiency of a combination of pulleys?
Answer: The force of friction between the pulley and the rope. Loss of energy in the form oh heat and light.
Can a pulley system be 100% efficient in its operation?
How can you increase the efficiency of energy transfer?
This can be achieved by reducing wasted energy transfers so more of the input energy is usefully transferred. Mechanical devices can be made more efficient through lubrication to reduce the friction between moving parts of a machine and increase the amount of useful energy transferred.
Which electrical machine is more efficient and why?
Grade 9. Transformer is one of the most efficient device in electrical. The efficiency of transformer is greater than any other electrical machines. This is due to transformer is a static device and there is no any mechanical losses in transformers.
Which of the following machine will have maximum efficiency Mcq?
Transformer has maximum efficiency as it is static device means it does not have any moving parts in the main body of a transformer hence no mechanical loss is counted in transformer.
