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Consider the following statements: 
1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.
2. In SI engines no problems are encountered on account of pre-ignition.
3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.
Which of the statements given above are correct?
  • a)
    1, 2 and 3
  • b)
    Only 1 and 2
  • c)
    Only 2 and 3
  • d)
    Only 1 and 3
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements:1. In the SI engines detonation occu...
Ans. (d)
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Consider the following statements:1. In the SI engines detonation occu...
Explanation:
SI engines (Spark Ignition) and CI engines (Compression Ignition) are two types of internal combustion engines used in automobiles. The given statements compare the differences between the two types of engines:

1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.
- Detonation in SI engines occurs due to uncontrolled burning of fuel mixture, leading to high pressure and temperature.
- Knocking in CI engines occurs due to premature ignition of fuel before the piston reaches the top dead center (TDC).
- The difference in occurrence of detonation and knocking is due to the difference in the combustion process in the two engines.

2. In SI engines no problems are encountered on account of pre-ignition.
- Pre-ignition is the ignition of fuel mixture before the spark plug fires in SI engines.
- Pre-ignition can cause damage to the engine due to high pressure and temperature developed in the cylinder.
- SI engines are designed to prevent pre-ignition by controlling the spark timing and using proper fuel.

3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.
- Knocking tendency is the propensity of the fuel mixture to ignite before the spark plug fires.
- In SI engines, low inlet pressure and temperature reduces the knocking tendency by reducing the pressure and temperature developed in the cylinder during combustion.
- In CI engines, low inlet pressure and temperature increases the knocking tendency by reducing the time available for fuel to mix with air and reducing the temperature required for ignition.

Therefore, the correct statements are:
- Only 1 and 3
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Consider the following statements:1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.2. In SI engines no problems are encountered on account of pre-ignition.3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.Which of the statements given above are correct?a)1, 2 and 3b)Only 1 and 2c)Only 2 and 3d)Only 1 and 3Correct answer is option 'D'. Can you explain this answer?
Question Description
Consider the following statements:1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.2. In SI engines no problems are encountered on account of pre-ignition.3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.Which of the statements given above are correct?a)1, 2 and 3b)Only 1 and 2c)Only 2 and 3d)Only 1 and 3Correct answer is option 'D'. 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 Consider the following statements:1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.2. In SI engines no problems are encountered on account of pre-ignition.3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.Which of the statements given above are correct?a)1, 2 and 3b)Only 1 and 2c)Only 2 and 3d)Only 1 and 3Correct answer is option 'D'. 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 Consider the following statements:1. In the SI engines detonation occurs near the end of combustion whereas in CI engines knocking occurs near the beginning of combustion.2. In SI engines no problems are encountered on account of pre-ignition.3. Low inlet pressure and temperature reduce knocking tendency in SI engines but increase the knocking tendency in CI engines.Which of the statements given above are correct?a)1, 2 and 3b)Only 1 and 2c)Only 2 and 3d)Only 1 and 3Correct answer is option 'D'. Can you explain this answer?.
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