Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:I. The perf...
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Consider the following statements:
I. The performance of an S.I. engine can be improved by increasing the compression ratio.
II. Fuels of higher octane number can be employed at higher compression ratio.Of these statements
I. The performance of an S.I. engine can be improved by increasing the compression ratio.
II. Fuels of higher octane number can be employed at higher compression ratio.Of these statements
- a)Both I and II are true
- b)both I and II are false
- c)I is true but II is false
- d)I is false but II is true
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following statements:I. The performance of an S.I. engine...
Ans. (d) The performance of S.I. engine can't be improved by increasing the compression ratio because of pre-ignition and detonation.
Since high octane number tends to suppress detonation, t6 some extent fuels of higher octane number will be helpful at higher compression ratio.
Since high octane number tends to suppress detonation, t6 some extent fuels of higher octane number will be helpful at higher compression ratio.
Most Upvoted Answer
Consider the following statements:I. The performance of an S.I. engine...
Explanation:
The performance of an S.I. engine can be improved by increasing the compression ratio. However, fuels with higher octane numbers are used to prevent knocking in high compression ratio engines. Therefore, statement I is true but statement II is false.
Reasoning:
• Compression ratio is defined as the ratio of the volume of the combustion chamber when the piston is at the bottom dead center to the volume of the combustion chamber when the piston is at the top dead center.
• Increasing the compression ratio increases the temperature and pressure inside the combustion chamber, which leads to better combustion efficiency and increased power output.
• However, in high compression ratio engines, there is a risk of knocking, which is the uncontrolled combustion of fuel-air mixture in the combustion chamber. Knocking can cause engine damage and reduce performance.
• Fuels with higher octane numbers have better resistance to knocking, and they can be used in high compression ratio engines to prevent knocking.
• Therefore, statement I is true because increasing the compression ratio improves engine performance. However, statement II is false because higher octane fuels are not used to increase the compression ratio, but rather to prevent knocking in high compression ratio engines.
The performance of an S.I. engine can be improved by increasing the compression ratio. However, fuels with higher octane numbers are used to prevent knocking in high compression ratio engines. Therefore, statement I is true but statement II is false.
Reasoning:
• Compression ratio is defined as the ratio of the volume of the combustion chamber when the piston is at the bottom dead center to the volume of the combustion chamber when the piston is at the top dead center.
• Increasing the compression ratio increases the temperature and pressure inside the combustion chamber, which leads to better combustion efficiency and increased power output.
• However, in high compression ratio engines, there is a risk of knocking, which is the uncontrolled combustion of fuel-air mixture in the combustion chamber. Knocking can cause engine damage and reduce performance.
• Fuels with higher octane numbers have better resistance to knocking, and they can be used in high compression ratio engines to prevent knocking.
• Therefore, statement I is true because increasing the compression ratio improves engine performance. However, statement II is false because higher octane fuels are not used to increase the compression ratio, but rather to prevent knocking in high compression ratio engines.
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Consider the following statements:I. The performance of an S.I. engine can be improved by increasing the compression ratio.II. Fuels of higher octane number can be employed at higher compression ratio.Of these statementsa)Both I and II are trueb)both I and II are falsec)I is true but II is falsed)I is false but II is trueCorrect answer is option 'D'. Can you explain this answer?
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