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Consider the following statements
1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin
2. Tetraethyl lead is added to gasoline to increase octane number.
3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.
4. Surface ignition need not necessarily cause knocking.
Which of these statements are correct?
1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin
2. Tetraethyl lead is added to gasoline to increase octane number.
3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.
4. Surface ignition need not necessarily cause knocking.
Which of these statements are correct?
- a)1, 2, 3 and 4
- b)2, 3 and 4
- c)1 and 4
- d)1,2 and 3
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements1. Octane rating of gasoline is based...
Ans. (b) Octane rating of gasoline is based on iso-octane and n-heptane fuels which are paraffin so 1 is wrong.
Most Upvoted Answer
Consider the following statements1. Octane rating of gasoline is based...
Octane Rating and Gasoline
Octane rating is a measure of a fuel's ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating spontaneously in the engine. The higher the octane rating, the more resistant the fuel is to knocking.
The octane rating of gasoline is based on two reference fuels: iso-octane (C8H18), which resists knocking, and iso-heptane (C7H16), which promotes knocking. These reference fuels are blended together to create a range of fuels with different octane ratings.
Tetraethyl Lead in Gasoline
In the past, tetraethyl lead (TEL) was commonly added to gasoline to increase its octane rating. TEL is a highly toxic compound that can cause health problems and environmental damage, and its use has been phased out in many countries.
Scavenging Agent in Gasoline
When TEL is burned in the engine, it can leave deposits on the spark plugs, which can cause knocking. To prevent this, a scavenging agent such as ethylene di-bromide (EDB) was added to gasoline to remove these lead deposits.
Surface Ignition and Knocking
Surface ignition is a type of combustion that occurs when the air/fuel mixture ignites at a hot spot on the combustion chamber wall, rather than from the spark plug. This can cause knocking, but not necessarily, as knocking can also be caused by other factors such as compression ratio, engine speed, and load.
Correct Statements
Based on the above information, the correct statements are:
- Tetraethyl lead is added to gasoline to increase octane number.
- Ethylene di-bromide is added as a scavenging agent to remove lead deposits on spark plugs.
- Surface ignition need not necessarily cause knocking.
Therefore, option B is the correct answer.
Octane rating is a measure of a fuel's ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating spontaneously in the engine. The higher the octane rating, the more resistant the fuel is to knocking.
The octane rating of gasoline is based on two reference fuels: iso-octane (C8H18), which resists knocking, and iso-heptane (C7H16), which promotes knocking. These reference fuels are blended together to create a range of fuels with different octane ratings.
Tetraethyl Lead in Gasoline
In the past, tetraethyl lead (TEL) was commonly added to gasoline to increase its octane rating. TEL is a highly toxic compound that can cause health problems and environmental damage, and its use has been phased out in many countries.
Scavenging Agent in Gasoline
When TEL is burned in the engine, it can leave deposits on the spark plugs, which can cause knocking. To prevent this, a scavenging agent such as ethylene di-bromide (EDB) was added to gasoline to remove these lead deposits.
Surface Ignition and Knocking
Surface ignition is a type of combustion that occurs when the air/fuel mixture ignites at a hot spot on the combustion chamber wall, rather than from the spark plug. This can cause knocking, but not necessarily, as knocking can also be caused by other factors such as compression ratio, engine speed, and load.
Correct Statements
Based on the above information, the correct statements are:
- Tetraethyl lead is added to gasoline to increase octane number.
- Ethylene di-bromide is added as a scavenging agent to remove lead deposits on spark plugs.
- Surface ignition need not necessarily cause knocking.
Therefore, option B is the correct answer.
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Consider the following statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct 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 statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct 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 statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct 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 statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct 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 statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct answer is option 'B'. Can you explain this answer?.
Solutions for Consider the following statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct 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 statements1. Octane rating of gasoline is based on iso-octane and iso-heptane fuelswhich are paraffin2. Tetraethyl lead is added to gasoline to increase octane number.3. Ethylene di-bromide is added as scavenging agent to remove lead depositson spark plugs.4. Surface ignition need not necessarily cause knocking.Which of these statements are correct?a)1, 2, 3 and 4b)2, 3 and 4c)1 and 4d)1,2 and 3Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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