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Consider the following statements:
Detonation in the S.I. engine can be suppressed by
1. Retarding the spark timing.
2. Increasing the engine speed.
3. Using 10% rich mixture.
Of these statements
Detonation in the S.I. engine can be suppressed by
1. Retarding the spark timing.
2. Increasing the engine speed.
3. Using 10% rich mixture.
Of these statements
- a)1 and 3 are correct
- b)2 and 3 are correct
- c)1, 2 and 3 are correct
- d)1 and 2 are correct
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements:Detonation in the S.I. engine can be...
Ans. (d) Decreasing the engine speed increases possibility of detonation
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Consider the following statements:Detonation in the S.I. engine can be...
Detonation, also known as engine knocking or pinging, is an undesirable phenomenon that occurs in spark ignition (S.I.) engines. It refers to the spontaneous combustion of the air-fuel mixture in the combustion chamber before the spark plug ignites it. This can cause severe damage to the engine and reduce its efficiency. Therefore, it is important to suppress detonation in S.I. engines.
1. Retarding the spark timing:
- Retarding the spark timing refers to delaying the spark plug firing relative to the piston position. This can help to suppress detonation.
- When the spark timing is advanced, the air-fuel mixture may ignite prematurely, leading to detonation. By retarding the spark timing, the spark plug ignites the mixture at a later stage, allowing the piston to reach a more optimal position for combustion.
- This helps to reduce the pressure and temperature in the combustion chamber, minimizing the chances of detonation.
2. Increasing the engine speed:
- Increasing the engine speed can also help to suppress detonation.
- At higher engine speeds, the air-fuel mixture has less time to react and ignite spontaneously before the spark plug fires. This reduces the chances of detonation occurring.
- Additionally, higher engine speeds typically result in a greater air-fuel mixing and turbulence in the combustion chamber, which promotes more complete combustion and reduces the likelihood of detonation.
3. Using a 10% rich mixture:
- A rich mixture refers to an air-fuel mixture with a higher proportion of fuel compared to the stoichiometric ratio.
- Using a 10% rich mixture can help to suppress detonation.
- The excess fuel in the mixture absorbs and dissipates more heat during combustion, reducing the peak temperatures in the combustion chamber. This makes it less likely for the air-fuel mixture to undergo spontaneous combustion and cause detonation.
In conclusion, all three statements are correct in suppressing detonation in S.I. engines. Retarding the spark timing, increasing the engine speed, and using a 10% rich mixture all contribute to reducing the likelihood of spontaneous combustion and minimizing detonation.
1. Retarding the spark timing:
- Retarding the spark timing refers to delaying the spark plug firing relative to the piston position. This can help to suppress detonation.
- When the spark timing is advanced, the air-fuel mixture may ignite prematurely, leading to detonation. By retarding the spark timing, the spark plug ignites the mixture at a later stage, allowing the piston to reach a more optimal position for combustion.
- This helps to reduce the pressure and temperature in the combustion chamber, minimizing the chances of detonation.
2. Increasing the engine speed:
- Increasing the engine speed can also help to suppress detonation.
- At higher engine speeds, the air-fuel mixture has less time to react and ignite spontaneously before the spark plug fires. This reduces the chances of detonation occurring.
- Additionally, higher engine speeds typically result in a greater air-fuel mixing and turbulence in the combustion chamber, which promotes more complete combustion and reduces the likelihood of detonation.
3. Using a 10% rich mixture:
- A rich mixture refers to an air-fuel mixture with a higher proportion of fuel compared to the stoichiometric ratio.
- Using a 10% rich mixture can help to suppress detonation.
- The excess fuel in the mixture absorbs and dissipates more heat during combustion, reducing the peak temperatures in the combustion chamber. This makes it less likely for the air-fuel mixture to undergo spontaneous combustion and cause detonation.
In conclusion, all three statements are correct in suppressing detonation in S.I. engines. Retarding the spark timing, increasing the engine speed, and using a 10% rich mixture all contribute to reducing the likelihood of spontaneous combustion and minimizing detonation.
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Consider the following statements:Detonation in the S.I. engine can be suppressed by1. Retarding the spark timing.2. Increasing the engine speed.3. Using 10% rich mixture.Of these statementsa)1 and 3 are correctb)2 and 3 are correctc)1, 2 and 3 are correctd)1 and 2 are correctCorrect answer is option 'D'. Can you explain this answer?
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