Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:1. For SI e...
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Consider the following statements:
1. For SI engines fuels most preferred are aromatics.
2. Paraffins are most preferred for Cl engine fuels.
3. Ignition quality of diesel fuel is indicated by its cetane number.
4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.
1. For SI engines fuels most preferred are aromatics.
2. Paraffins are most preferred for Cl engine fuels.
3. Ignition quality of diesel fuel is indicated by its cetane number.
4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.
Which of these statements are valid ?
- a)1,2, 3 and 4
- b)1,2 and 3
- c)1,3 and 4
- d)2, 3 and 4
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:1. For SI engines fuels most preferr...
Normal paraffins exhibit the poorest antiknock quality when used in an SI engine. The antiknock quality improves with the increasing number of carbon atoms and the compactness of the molecular structure. The aromatics offer the best resistance to knocking in Si engines.
Most Upvoted Answer
Consider the following statements:1. For SI engines fuels most preferr...
The valid statements among the given options are 1, 2, and 3. Let's discuss each statement in detail:
1. For SI engines, fuels most preferred are aromatics:
- This statement is not valid. Aromatics such as benzene, toluene, and xylene have higher octane ratings, but they are not the most preferred fuels for spark-ignition (SI) engines. Aromatics can lead to increased emissions of pollutants such as unburned hydrocarbons and particulate matter. Therefore, the preferred fuels for SI engines are hydrocarbons with lower aromatic content, such as alkanes (paraffins) and alkenes (olefins).
2. Paraffins are most preferred for CI engine fuels:
- This statement is valid. In compression-ignition (CI) engines, also known as diesel engines, paraffins (alkanes) are the most preferred fuels. Paraffins have high cetane numbers, which indicate good ignition quality in CI engines. Higher cetane numbers result in shorter ignition delays, better combustion, and reduced emissions. Diesel fuels typically consist of paraffinic hydrocarbons.
3. Ignition quality of diesel fuel is indicated by its cetane number:
- This statement is valid. The cetane number is a measure of the ignition quality of diesel fuel. It indicates the fuel's ability to ignite and burn under pressure in a CI engine. Higher cetane numbers indicate better ignition quality, shorter ignition delays, and smoother combustion. Diesel fuels with higher cetane numbers have improved cold-starting, reduced emissions, and better engine performance.
4. Normal paraffins exhibit the best antiknock quality when used in an SI engine:
- This statement is not valid. Normal paraffins (n-paraffins) have lower octane ratings and exhibit poor antiknock quality when used in SI engines. Branched paraffins and aromatic compounds have higher octane ratings and better antiknock properties. Therefore, normal paraffins are not the best choice for SI engine fuels.
In conclusion, the valid statements among the given options are 2 and 3. Paraffins are indeed the most preferred fuels for CI engines, and the ignition quality of diesel fuel is indicated by its cetane number.
1. For SI engines, fuels most preferred are aromatics:
- This statement is not valid. Aromatics such as benzene, toluene, and xylene have higher octane ratings, but they are not the most preferred fuels for spark-ignition (SI) engines. Aromatics can lead to increased emissions of pollutants such as unburned hydrocarbons and particulate matter. Therefore, the preferred fuels for SI engines are hydrocarbons with lower aromatic content, such as alkanes (paraffins) and alkenes (olefins).
2. Paraffins are most preferred for CI engine fuels:
- This statement is valid. In compression-ignition (CI) engines, also known as diesel engines, paraffins (alkanes) are the most preferred fuels. Paraffins have high cetane numbers, which indicate good ignition quality in CI engines. Higher cetane numbers result in shorter ignition delays, better combustion, and reduced emissions. Diesel fuels typically consist of paraffinic hydrocarbons.
3. Ignition quality of diesel fuel is indicated by its cetane number:
- This statement is valid. The cetane number is a measure of the ignition quality of diesel fuel. It indicates the fuel's ability to ignite and burn under pressure in a CI engine. Higher cetane numbers indicate better ignition quality, shorter ignition delays, and smoother combustion. Diesel fuels with higher cetane numbers have improved cold-starting, reduced emissions, and better engine performance.
4. Normal paraffins exhibit the best antiknock quality when used in an SI engine:
- This statement is not valid. Normal paraffins (n-paraffins) have lower octane ratings and exhibit poor antiknock quality when used in SI engines. Branched paraffins and aromatic compounds have higher octane ratings and better antiknock properties. Therefore, normal paraffins are not the best choice for SI engine fuels.
In conclusion, the valid statements among the given options are 2 and 3. Paraffins are indeed the most preferred fuels for CI engines, and the ignition quality of diesel fuel is indicated by its cetane number.
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Consider the following statements:1. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:1. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. 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. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. 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. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements:1. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. 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. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. 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. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. Can you explain this answer?.
Solutions for Consider the following statements:1. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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ample number of questions to practice Consider the following statements:1. For SI engines fuels most preferred are aromatics.2. Paraffins are most preferred for Cl engine fuels.3. Ignition quality of diesel fuel is indicated by its cetane number.4. Normal paraffins exhibit the best antiknock quality when used in an SI engine.Which of these statements are valid ?a)1,2, 3 and 4b)1,2 and 3c)1,3 and 4d)2, 3 and 4Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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