Mechanical Engineering Exam > Mechanical Engineering Questions > By higher octane number of SI fuel, it means ...
Start Learning for Free
By higher octane number of SI fuel, it means that fuel has
- a)Higher heating value
- b)Higher flash point
- c)Lower volatility
- d)Longer ignition delay
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
By higher octane number of SI fuel, it means that fuel hasa)Higher hea...
Higher octane is related only to longer ignition delay which prevents knocking. High octane fuel itself don’t increase the power or enhance any other property of fuel
Most Upvoted Answer
By higher octane number of SI fuel, it means that fuel hasa)Higher hea...
Octane Number of SI Fuel
Octane number is a measure of a fuel's ability to resist "knocking" or detonation during combustion caused by the air/fuel mixture detonating prematurely in the engine. Higher octane fuels are more resistant to knocking than lower octane fuels.
Higher Ignition Delay
The higher the octane number of a fuel, the longer the ignition delay. The ignition delay is the time that elapses between the spark ignition and the onset of combustion. When a fuel has a longer ignition delay, it means that it takes longer for the fuel to combust, which helps to prevent knocking in the engine.
Factors Affecting Octane Number
The octane number of a fuel is mainly influenced by its chemical composition. The two primary factors that determine the octane number of a fuel are:
1. The percentage of iso-octane (2,2,4-trimethylpentane) in the fuel
2. The percentage of heptane in the fuel
Iso-octane has a high resistance to knocking, while heptane has a low resistance to knocking. So, fuels with a higher percentage of iso-octane and a lower percentage of heptane will have a higher octane number.
Conclusion
In conclusion, the higher octane number of SI fuel means that the fuel has a longer ignition delay. This is due to the chemical composition of the fuel, which includes the percentage of iso-octane and heptane. Higher octane fuels are more resistant to knocking and are used in high-performance engines to improve engine efficiency and power output.
Octane number is a measure of a fuel's ability to resist "knocking" or detonation during combustion caused by the air/fuel mixture detonating prematurely in the engine. Higher octane fuels are more resistant to knocking than lower octane fuels.
Higher Ignition Delay
The higher the octane number of a fuel, the longer the ignition delay. The ignition delay is the time that elapses between the spark ignition and the onset of combustion. When a fuel has a longer ignition delay, it means that it takes longer for the fuel to combust, which helps to prevent knocking in the engine.
Factors Affecting Octane Number
The octane number of a fuel is mainly influenced by its chemical composition. The two primary factors that determine the octane number of a fuel are:
1. The percentage of iso-octane (2,2,4-trimethylpentane) in the fuel
2. The percentage of heptane in the fuel
Iso-octane has a high resistance to knocking, while heptane has a low resistance to knocking. So, fuels with a higher percentage of iso-octane and a lower percentage of heptane will have a higher octane number.
Conclusion
In conclusion, the higher octane number of SI fuel means that the fuel has a longer ignition delay. This is due to the chemical composition of the fuel, which includes the percentage of iso-octane and heptane. Higher octane fuels are more resistant to knocking and are used in high-performance engines to improve engine efficiency and power output.
|
Explore Courses for Mechanical Engineering exam
|
|
Top Courses for Mechanical EngineeringView all
Question Description
By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer?.
By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer?.
Solutions for By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice By higher octane number of SI fuel, it means that fuel hasa)Higher heating valueb)Higher flash pointc)Lower volatilityd)Longer ignition delayCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up
within 7 days!
within 7 days!
Takes less than 10 seconds to signup