Mechanical Engineering Exam > Mechanical Engineering Questions > Detonation in the SI engine becomes severe du...
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Detonation in the SI engine becomes severe during
- a)Low load and high speed
- b)High load and high speed
- c)Low load and low speed
- d)High load and low speed
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Detonation in the SI engine becomes severe duringa)Low load and high s...
Detonation in SI engine will become severe at high load and low speed because at higher loads, the temperature of cylinder and combustion chamber walls will be higher and hence temperature of the end charge will be more which increases knocking tendency in SI engine.
And at lower engine speed, longer will be the absolute time for the flame to traverse the cylinder which increases the time available for pre flame reactions hence the tendency to knock increases.
Most Upvoted Answer
Detonation in the SI engine becomes severe duringa)Low load and high s...
Detonation in the SI engine becomes severe during high load and low speed. This means that when the engine is operating under heavy load conditions and at a low speed, the likelihood of experiencing detonation increases.
Explanation:
1. **What is detonation in an SI engine?**
- Detonation, also known as knocking or pinging, is an abnormal combustion phenomenon that occurs in spark-ignition (SI) engines.
- It is characterized by the rapid and uncontrolled burning of the air-fuel mixture in the combustion chamber, resulting in a sharp increase in pressure and temperature.
- This can lead to engine damage and reduced performance if not controlled.
2. **Factors affecting detonation**
- Detonation is influenced by several factors, including load, speed, compression ratio, spark timing, air-fuel mixture, and engine design.
- Among these factors, load and speed have a significant impact on the severity of detonation.
3. **High load**
- When the engine is operating under high load conditions, it means that the demand for power is high.
- This requires a larger amount of air-fuel mixture to be combusted, resulting in higher pressures and temperatures in the combustion chamber.
- The increased pressure and temperature can create favorable conditions for the occurrence of detonation.
4. **Low speed**
- At low engine speeds, the combustion process is relatively slower compared to higher speeds.
- This slower combustion allows more time for the air-fuel mixture to react and potentially form pockets of unburned mixture.
- These pockets of unburned mixture can act as hot spots, promoting the onset of detonation.
5. **Combination of high load and low speed**
- When the engine operates under high load and low speed simultaneously, the conditions for detonation become more severe.
- The high load increases the pressure and temperature in the combustion chamber, while the low speed allows more time for unburned mixture to accumulate.
- This combination amplifies the likelihood of detonation occurring and can lead to more severe consequences.
In conclusion, the detonation in an SI engine becomes severe during high load and low speed conditions. The combination of high load and low speed creates a favorable environment for detonation to occur, which can result in engine damage and reduced performance.
Explanation:
1. **What is detonation in an SI engine?**
- Detonation, also known as knocking or pinging, is an abnormal combustion phenomenon that occurs in spark-ignition (SI) engines.
- It is characterized by the rapid and uncontrolled burning of the air-fuel mixture in the combustion chamber, resulting in a sharp increase in pressure and temperature.
- This can lead to engine damage and reduced performance if not controlled.
2. **Factors affecting detonation**
- Detonation is influenced by several factors, including load, speed, compression ratio, spark timing, air-fuel mixture, and engine design.
- Among these factors, load and speed have a significant impact on the severity of detonation.
3. **High load**
- When the engine is operating under high load conditions, it means that the demand for power is high.
- This requires a larger amount of air-fuel mixture to be combusted, resulting in higher pressures and temperatures in the combustion chamber.
- The increased pressure and temperature can create favorable conditions for the occurrence of detonation.
4. **Low speed**
- At low engine speeds, the combustion process is relatively slower compared to higher speeds.
- This slower combustion allows more time for the air-fuel mixture to react and potentially form pockets of unburned mixture.
- These pockets of unburned mixture can act as hot spots, promoting the onset of detonation.
5. **Combination of high load and low speed**
- When the engine operates under high load and low speed simultaneously, the conditions for detonation become more severe.
- The high load increases the pressure and temperature in the combustion chamber, while the low speed allows more time for unburned mixture to accumulate.
- This combination amplifies the likelihood of detonation occurring and can lead to more severe consequences.
In conclusion, the detonation in an SI engine becomes severe during high load and low speed conditions. The combination of high load and low speed creates a favorable environment for detonation to occur, which can result in engine damage and reduced performance.
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Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer?.
Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Detonation in the SI engine becomes severe duringa)Low load and high speedb)High load and high speedc)Low load and low speedd)High load and low speedCorrect answer is option 'D'. Can you explain this answer?.
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