How do you calculate the IMA of a ramp?
To calculate the ideal mechanical advantage for an inclined plane, divide the length of the incline by the height of the incline. Example: An inclined plane that is 6 meters long and 3 meters high creates an ideal mechanical advantage of 2. The inclined plane increases the force that is being exerted by 2 times.
Why is no machine 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.
Are machines 100% efficient?
Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input. Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.
How does using a ramp make work easier?
A ramp is an example of an inclined plane. Using an inclined plane makes it easier to move an object. It takes less force to move an object in an upward direction on an inclined plane than it does to lift the object straight up. Moving the object up an inclined plane requires moving it an increased distance.
Can a perfectly 100% efficient system ever be created?
No its not. According to thumb rule, energy efficiency can only be 1 (100%) when output is equal to input (all work done convert into energy) which is not possible because of various factors like heat loss, friction loss etc.
Is Carnot cycle 100 efficient?
All heat engine cycles must reject some heat for an efficiency of less than 100%. The Carnot cycle does this in the most efficient manner.
What is the most efficient energy conversion?
Most Efficient Energy Sources Although there are many types of energy, the most efficient forms are renewable: hydro-thermal, tidal, wind, and solar. Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use.
Why Carnot cycle is most efficient?
The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws. This means that the Carnot cycle is an idealization, since no real engine processes are reversible and all real physical processes involve some increase in entropy.
Is Carnot cycle reversible?
The Carnot heat-engine cycle described is a totally reversible cycle. That is all the processes that compose it can be reversed, in which case it becomes the Carnot refrigeration cycle.
Why is Carnot cycle Impossible?
Carnot cycles are not encountered in reality since achieving isothermal heat transfer is very difficult (needs very large heat exchangers and long time). Also process 3-4 requires a pump or compressor that can handle two phase mixture (liquid and vapor) which is impractical.
What is Carnot principle?
Carnot’s theorem states that all heat engines between two heat reservoirs are less efficient than a Carnot heat engine operating between the same reservoirs. Every Carnot heat engine between a pair of heat reservoirs is equally efficient, regardless of the working substance employed or the operation details.
Where is Carnot cycle used?
Carnot cycle, in heat engines, ideal cyclical sequence of changes of pressures and temperatures of a fluid, such as a gas used in an engine, conceived early in the 19th century by the French engineer Sadi Carnot. It is used as a standard of performance of all heat engines operating between a high and a low temperature.
What are the four process of Carnot cycle?
Name the processes involved in Carnot cycle? It involves four process: isothermal expansion, adiabatic expansion, isothermal compression and adiabatic compression.
What is the formula of efficiency of Carnot engine?
It is well known that the Carnot cycle efficiency ( η thermal = 1 − T L T H ) is maximized with the highest possible heat source temperature TH and the lowest possible heat sink temperature TL.
What is Carnot cycle with diagram?
The Carnot cycle consists of the following four processes: A reversible isothermal gas expansion process. In this process, the ideal gas in the system absorbs qin amount heat from a heat source at a high temperature Thigh, expands and does work on surroundings….T-S Diagram.
What is the formula of efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
How do you calculate a Carnot cycle?
W=QH−QC=(1−TCTH)QH. efficiency =WQH=1−TCTH. These temperatures are of course in degrees Kelvin, so for example the efficiency of a Carnot engine having a hot reservoir of boiling water and a cold reservoir ice cold water will be 1−(273/373)=0.27, just over a quarter of the heat energy is transformed into useful work.
What is Otto cycle with diagram?
The idealized diagrams of a four-stroke Otto cycle Both diagrams: the intake (A) stroke is performed by an isobaric expansion, followed by an adiabatic compression (B) stroke.
What is the working fluid in Carnot cycle?
In a carnot cycle, what is the working fluid? Explanation: As Carnot cycle is an ideal cycle, so the working fluid is an ideal gas. 4.
Is Carnot engine a heat engine?
A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. The basic model for this engine was developed by Nicolas Léonard Sadi Carnot in 1824. In the process of going through this cycle, the system may perform work on its surroundings, thereby acting as a heat engine.
What is the difference between the Brayton cycle and the Rankine Cycle?
Brayton cycle consists of two reversible isobaric processes and Rankine cycle consist of two reversible adiabatic processes. Brayton cycle operates between a higher pressure ratio than the Rankine cycle for the same capacity. …
What is reversed Carnot cycle?
Reversing the Carnot cycle does reverse the directions of heat and work interactions. A refrigerator or heat pump that operates on the reversed Carnot cycle is called a Carnot refrigerator or a Carnot heat pump.
What is reverse Rankine Cycle?
An ideal thermodynamic cycle consisting of heat addition at constant pressure, isentropic expansion, heat rejection at constant pressure, and isentropic compression; used as an ideal standard for the performance of heat-engine and heat-pump installations operating with a condensable vapor as the working fluid, such as …
What is the difference between Carnot cycle and reversed Carnot cycle?
Reversed Carnot cycle is the same as that of the conventional Carnot Cycle except for the direction of the processes.
Is Rankine cycle reversible?
Rankine cycle is a heat engine comprised of four internally reversible processes. and reversible (isentropic), the pump and the turbine, the only energy interaction with surroundings is work. For the two isobaric heat exchange processes, the devices are passive and there is no work, only heat transfer.
What is difference between Carnot and Rankine Cycle?
Difference Between Carnot And Rankine Cycle In Tabular Form Carnot cycle is a theoretical cycle. Its efficiency at its highest between two temperature difference. Rankine cycle is a practical cycle of turbine and steam engine. Carnot cycle uses air as the working substance.