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A diesel engine is usually more efficient than a spark ignition engine because
- a)diesel being a heavier hydrocarbon, releases more heat per kg than gasoline
- b)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratio
- c)The compression ratio of a diesel engine is higher than that of an SI engine
- d)Self ignition temperature of diesel is higher than that of gasoline
Correct answer is option 'C'. Can you explain this answer?
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A diesel engine is usually more efficient than a spark ignition engine...
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A diesel engine is usually more efficient than a spark ignition engine...
Introduction:
A diesel engine is known for its efficiency compared to a spark ignition (SI) engine. There are several reasons for this, and one of the main factors is the higher compression ratio in a diesel engine.
Explanation:
1. Higher compression ratio:
The compression ratio is the ratio of the maximum volume of the combustion chamber to the minimum volume. In a diesel engine, the compression ratio is typically higher than that of an SI engine. This means that the air-fuel mixture in a diesel engine is compressed to a higher pressure before combustion occurs.
2. Carnot efficiency:
The efficiency of an engine is determined by the Carnot efficiency, which is the maximum efficiency possible for a heat engine operating between two temperature extremes. The Carnot efficiency depends on the temperature difference between the hot and cold reservoirs. In a diesel engine, the higher compression ratio leads to a higher peak temperature during combustion, which results in a higher temperature difference and, therefore, a higher Carnot efficiency.
3. Adiabatic efficiency:
The adiabatic efficiency is a measure of how much of the energy generated during combustion is converted into useful work. In a diesel engine, the higher compression ratio leads to a more adiabatic combustion process. This means that less heat is lost to the surroundings, resulting in a higher adiabatic efficiency.
4. Diesel fuel properties:
Diesel fuel has a higher energy density compared to gasoline. This means that a smaller amount of diesel fuel can produce the same amount of energy as a larger amount of gasoline. Therefore, a diesel engine can achieve a higher thermal efficiency by extracting more energy from a given volume of fuel.
Conclusion:
In conclusion, a diesel engine is usually more efficient than a spark ignition engine due to various factors. The higher compression ratio in a diesel engine leads to a higher Carnot efficiency and adiabatic efficiency. Additionally, diesel fuel has a higher energy density, allowing a diesel engine to extract more energy from a given volume of fuel. These factors contribute to the overall higher efficiency of a diesel engine compared to a spark ignition engine.
A diesel engine is known for its efficiency compared to a spark ignition (SI) engine. There are several reasons for this, and one of the main factors is the higher compression ratio in a diesel engine.
Explanation:
1. Higher compression ratio:
The compression ratio is the ratio of the maximum volume of the combustion chamber to the minimum volume. In a diesel engine, the compression ratio is typically higher than that of an SI engine. This means that the air-fuel mixture in a diesel engine is compressed to a higher pressure before combustion occurs.
2. Carnot efficiency:
The efficiency of an engine is determined by the Carnot efficiency, which is the maximum efficiency possible for a heat engine operating between two temperature extremes. The Carnot efficiency depends on the temperature difference between the hot and cold reservoirs. In a diesel engine, the higher compression ratio leads to a higher peak temperature during combustion, which results in a higher temperature difference and, therefore, a higher Carnot efficiency.
3. Adiabatic efficiency:
The adiabatic efficiency is a measure of how much of the energy generated during combustion is converted into useful work. In a diesel engine, the higher compression ratio leads to a more adiabatic combustion process. This means that less heat is lost to the surroundings, resulting in a higher adiabatic efficiency.
4. Diesel fuel properties:
Diesel fuel has a higher energy density compared to gasoline. This means that a smaller amount of diesel fuel can produce the same amount of energy as a larger amount of gasoline. Therefore, a diesel engine can achieve a higher thermal efficiency by extracting more energy from a given volume of fuel.
Conclusion:
In conclusion, a diesel engine is usually more efficient than a spark ignition engine due to various factors. The higher compression ratio in a diesel engine leads to a higher Carnot efficiency and adiabatic efficiency. Additionally, diesel fuel has a higher energy density, allowing a diesel engine to extract more energy from a given volume of fuel. These factors contribute to the overall higher efficiency of a diesel engine compared to a spark ignition engine.
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A diesel engine is usually more efficient than a spark ignition engine...
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A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?
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A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?.
A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?.
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A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A diesel engine is usually more efficient than a spark ignition engine becausea)diesel being a heavier hydrocarbon, releases more heat per kg than gasolineb)The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixedcompression ratioc)The compression ratio of a diesel engine is higher than that of an SI engined)Self ignition temperature of diesel is higher than that of gasolineCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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