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Why efficiency of carnot heat engine is always greater than that of an actual engine?
The efficiency of a Carnot engine is theoretically always greater than that of an actual engine. The fact that it is impossible to build a thermodynamically reversable engine, which is one of the variables necessary to calculate its superiority to a real heat engine, makes the theorum practical for assessing a real heat engines efficiency only.
What is the efficiency of lawn mower's engine when the heat input is 1000 joules and the waste heat is 750 joules?
25 percent
How does the thermal efficiency of an ideal Otto Cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid?
The answer is 38.
Why does adding oil increases efficiency?
The purpose of adding oil to a car i to lubricate the engine. if the engine is not lubricated there will be much more friction between gears and friction generates heat. because energy is needed to create heat that energy is taken away from the energy that would be propelling the car forward. this causes the efficiency yo drop.
What is the efficiency of an engine that gives off 70 percent thermal energy?
It is not a good efficiency engine.
Which heat engine has more efficiency?
Carnot's heat engine has more efficiency then the other heat engine but it is assumption. Is is not real. RGUKT IIIT NUZVID: N091528
What is the formula for calculating the efficiency of a heat engine and how is it used in determining the performance of the engine?
The formula for calculating the efficiency of a heat engine is Efficiency (Work output / Heat input) x 100. This formula is used to determine how effectively the engine converts heat into useful work. A higher efficiency value indicates that the engine is more effective at converting heat energy into mechanical work, while a lower efficiency value indicates that more heat energy is wasted. By calculating the efficiency of a heat engine, engineers can assess its performance and make improvements to increase its efficiency.
What is the Carnot engine problem and how does it relate to the efficiency of a heat engine?
The Carnot engine problem refers to the theoretical limit on the efficiency of heat engines, as described by the Carnot cycle. This problem highlights that no real heat engine can be 100 efficient, as some energy is always lost as heat. The efficiency of a heat engine is limited by the Carnot efficiency, which depends on the temperatures of the heat source and sink. This concept helps engineers understand and improve the efficiency of real-world heat engines.
What limit does the second law of thermodynamics impose on the efficiency of a heat engine?
The second law of thermodynamics imposes a limit on the efficiency of a heat engine by stating that no engine can be 100 efficient in converting heat into work. This means that there will always be some heat loss in the process, limiting the efficiency of the engine.
How to calculate the efficiency of a heat engine?
To calculate the efficiency of a heat engine, you can use the formula: Efficiency (Work output / Heat input) x 100. This formula compares the amount of useful work produced by the engine to the amount of heat energy it takes in. The efficiency is expressed as a percentage, with higher percentages indicating a more efficient engine.
What is the definition of thermal efficiency?
the efficiency of a heat engine measured by the ratio of the work done by it to the heat supplied to it.
Which of the following methods is the most effective way to improve the efficiency of a heat engine?
Increasing the temperature of the heat source is the most effective way to improve the efficiency of a heat engine.
What is the efficiency of a cars engine when the heat input is 2000000 j and waste heat is 1500000 j?
The efficiency of the engine is calculated using the formula: Efficiency = (Useful work output / Total heat input). In this case, the useful work output is the heat input minus the waste heat, which is 500,000 J. Therefore, the efficiency of the engine would be (500,000 / 2,000,000) * 100% = 25%.
Why efficiency of carnot heat engine is always greater than that of an actual engine?
The efficiency of a Carnot engine is theoretically always greater than that of an actual engine. The fact that it is impossible to build a thermodynamically reversable engine, which is one of the variables necessary to calculate its superiority to a real heat engine, makes the theorum practical for assessing a real heat engines efficiency only.
What effect if any does this energy transfer have on the overall efficiency of the car engine?
As a "heat engine", a car engine must rid itself of heat to continue. Efficiency of the heat engine depends on the difference in temperature; therefore, as the temperature outside reaches the temperature inside, the engine stops.
What is the physics thermodynamics formula for calculating the efficiency of a heat engine?
The formula for calculating the efficiency of a heat engine is: Efficiency 1 - (Tc/Th), where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.
How can the efficiency of a heat engine be increased?
The efficiency of a heat engine can be increased by lowering the temperature of the cold reservoir and increasing the temperature of the hot reservoir. This difference in temperature, known as the temperature gradient, allows for more work to be extracted from the engine for a given amount of heat input. Additionally, reducing friction and heat losses in the engine components can also improve efficiency.
