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For an Otto cycle, the increase in compression ratio leads to
- a)an increase in thermal efficiency but a decrease in mean effective pressure
- b)a decrease in thermal efficiency but an increase in mean effective pressure
- c)a decrease in thermal efficiency and mean effective pressure
- d)an increase in thermal efficiency and mean effective pressure
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
For an Otto cycle, the increase in compression ratio leads toa)anincre...
Thermale fficiency of an Ottocycle is proportional to the compression ratio only and increase in compression leads the higher thermal efficiency and for same heat input higher workout put. Hence increase in mean effective pressure.
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For an Otto cycle, the increase in compression ratio leads toa)anincre...
Otto Cycle:
The Otto cycle is a theoretical thermodynamic cycle that describes the functioning of a typical spark-ignition internal combustion engine. It consists of four processes: intake, compression, combustion, and exhaust.
Compression Ratio:
The compression ratio is defined as the ratio of the maximum volume to the minimum volume in the combustion chamber during the engine cycle. It is a crucial parameter that affects the performance and efficiency of the Otto cycle.
Thermal Efficiency:
Thermal efficiency is a measure of how effectively an engine converts the heat energy from fuel into useful work. It is defined as the ratio of the net work output to the heat input.
Mean Effective Pressure:
Mean effective pressure (MEP) is a calculated value that represents the average pressure acting on the piston during the power stroke. It is a measure of the engine's power output.
Effect of Increase in Compression Ratio:
When the compression ratio is increased in an Otto cycle, the following effects can be observed:
Increase in Thermal Efficiency:
- As the compression ratio increases, the air-fuel mixture is compressed to a higher pressure and temperature before combustion.
- This leads to a more efficient combustion process, with a higher expansion ratio and a larger proportion of the heat energy being converted into useful work.
- Therefore, an increase in compression ratio generally results in an increase in thermal efficiency.
Increase in Mean Effective Pressure:
- The mean effective pressure is directly related to the thermal efficiency of the engine.
- Since an increase in compression ratio leads to an increase in thermal efficiency, it also results in an increase in mean effective pressure.
- This is because a higher thermal efficiency indicates that more work is being extracted from the same amount of heat input, resulting in a higher power output.
Conclusion:
Therefore, an increase in compression ratio in an Otto cycle leads to an increase in both thermal efficiency and mean effective pressure. This is because the higher compression ratio improves the combustion process, resulting in a more efficient conversion of heat energy into work.
The Otto cycle is a theoretical thermodynamic cycle that describes the functioning of a typical spark-ignition internal combustion engine. It consists of four processes: intake, compression, combustion, and exhaust.
Compression Ratio:
The compression ratio is defined as the ratio of the maximum volume to the minimum volume in the combustion chamber during the engine cycle. It is a crucial parameter that affects the performance and efficiency of the Otto cycle.
Thermal Efficiency:
Thermal efficiency is a measure of how effectively an engine converts the heat energy from fuel into useful work. It is defined as the ratio of the net work output to the heat input.
Mean Effective Pressure:
Mean effective pressure (MEP) is a calculated value that represents the average pressure acting on the piston during the power stroke. It is a measure of the engine's power output.
Effect of Increase in Compression Ratio:
When the compression ratio is increased in an Otto cycle, the following effects can be observed:
Increase in Thermal Efficiency:
- As the compression ratio increases, the air-fuel mixture is compressed to a higher pressure and temperature before combustion.
- This leads to a more efficient combustion process, with a higher expansion ratio and a larger proportion of the heat energy being converted into useful work.
- Therefore, an increase in compression ratio generally results in an increase in thermal efficiency.
Increase in Mean Effective Pressure:
- The mean effective pressure is directly related to the thermal efficiency of the engine.
- Since an increase in compression ratio leads to an increase in thermal efficiency, it also results in an increase in mean effective pressure.
- This is because a higher thermal efficiency indicates that more work is being extracted from the same amount of heat input, resulting in a higher power output.
Conclusion:
Therefore, an increase in compression ratio in an Otto cycle leads to an increase in both thermal efficiency and mean effective pressure. This is because the higher compression ratio improves the combustion process, resulting in a more efficient conversion of heat energy into work.
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For an Otto cycle, the increase in compression ratio leads toa)anincrease in thermal efficiency but a decrease in mean effective pressureb)a decrease in thermal efficiency but an increase in mean effective pressurec)a decrease in thermal efficiency and mean effective pressured)an increase in thermal efficiency and mean effective pressureCorrect answer is option 'D'. Can you explain this answer?
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