Mechanical Engineering Exam > Mechanical Engineering Questions > Which of the following factors would increase...
Start Learning for Free
Which of the following factors would increase the probability of knock in theCI engines?
1. Long ignition delay of fuel
2. High self ignition temperature of fuel
3. Low volatility of fuel
Select the correct answer using the codes given below:
1. Long ignition delay of fuel
2. High self ignition temperature of fuel
3. Low volatility of fuel
Select the correct answer using the codes given below:
- a)1, 2 and 3
- b)1 and 2
- c)1 and 3
- d)2 and 3.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Which of the following factors would increase the probability of knock...
Ans. (a)
Most Upvoted Answer
Which of the following factors would increase the probability of knock...
Factors Increasing the Probability of Knock in CI Engines
Knocking is an undesirable phenomenon that occurs in internal combustion engines, especially in compression ignition (CI) engines. It is characterized by the spontaneous combustion of the air-fuel mixture before the spark plug ignites it. Knocking can lead to engine damage and reduced efficiency. Several factors can increase the probability of knock in CI engines. Let's discuss each factor in detail.
1. Long Ignition Delay of Fuel:
The ignition delay is the time interval between the start of fuel injection and the start of combustion. A longer ignition delay means that the fuel takes more time to ignite and burn completely. This can lead to a significant amount of fuel being present in the combustion chamber when the combustion process starts. As a result, the pressure and temperature in the chamber increase rapidly, causing knocking. Therefore, a long ignition delay of the fuel increases the probability of knock in CI engines.
2. High Self-Ignition Temperature of Fuel:
The self-ignition temperature (also known as the autoignition temperature) is the minimum temperature at which a fuel can spontaneously ignite without an external ignition source. Fuels with high self-ignition temperatures require higher temperatures in the combustion chamber to ignite. If the compression ratio of the engine is high, the air-fuel mixture can reach temperatures above the self-ignition temperature of the fuel before the spark plug ignites it. This can result in spontaneous ignition and knocking. Therefore, fuels with high self-ignition temperatures increase the probability of knock in CI engines.
3. Low Volatility of Fuel:
Volatility refers to the ability of a fuel to vaporize and form a combustible mixture with air. In CI engines, the fuel is injected into the combustion chamber as a liquid spray. If the fuel has low volatility, it may not vaporize completely before the start of combustion. This can lead to the formation of pockets of unburned fuel, which can ignite spontaneously and cause knocking. Therefore, low volatility of the fuel increases the probability of knock in CI engines.
In conclusion, all three factors mentioned in the question - long ignition delay of fuel, high self-ignition temperature of fuel, and low volatility of fuel - increase the probability of knock in CI engines. These factors contribute to the incomplete combustion of the fuel and the spontaneous ignition of the air-fuel mixture, resulting in knocking. Engine designers and fuel manufacturers take these factors into consideration to minimize the occurrence of knock and optimize engine performance.
Knocking is an undesirable phenomenon that occurs in internal combustion engines, especially in compression ignition (CI) engines. It is characterized by the spontaneous combustion of the air-fuel mixture before the spark plug ignites it. Knocking can lead to engine damage and reduced efficiency. Several factors can increase the probability of knock in CI engines. Let's discuss each factor in detail.
1. Long Ignition Delay of Fuel:
The ignition delay is the time interval between the start of fuel injection and the start of combustion. A longer ignition delay means that the fuel takes more time to ignite and burn completely. This can lead to a significant amount of fuel being present in the combustion chamber when the combustion process starts. As a result, the pressure and temperature in the chamber increase rapidly, causing knocking. Therefore, a long ignition delay of the fuel increases the probability of knock in CI engines.
2. High Self-Ignition Temperature of Fuel:
The self-ignition temperature (also known as the autoignition temperature) is the minimum temperature at which a fuel can spontaneously ignite without an external ignition source. Fuels with high self-ignition temperatures require higher temperatures in the combustion chamber to ignite. If the compression ratio of the engine is high, the air-fuel mixture can reach temperatures above the self-ignition temperature of the fuel before the spark plug ignites it. This can result in spontaneous ignition and knocking. Therefore, fuels with high self-ignition temperatures increase the probability of knock in CI engines.
3. Low Volatility of Fuel:
Volatility refers to the ability of a fuel to vaporize and form a combustible mixture with air. In CI engines, the fuel is injected into the combustion chamber as a liquid spray. If the fuel has low volatility, it may not vaporize completely before the start of combustion. This can lead to the formation of pockets of unburned fuel, which can ignite spontaneously and cause knocking. Therefore, low volatility of the fuel increases the probability of knock in CI engines.
In conclusion, all three factors mentioned in the question - long ignition delay of fuel, high self-ignition temperature of fuel, and low volatility of fuel - increase the probability of knock in CI engines. These factors contribute to the incomplete combustion of the fuel and the spontaneous ignition of the air-fuel mixture, resulting in knocking. Engine designers and fuel manufacturers take these factors into consideration to minimize the occurrence of knock and optimize engine performance.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
|
Explore Courses for Mechanical Engineering exam
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer?
Question Description
Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. 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 Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. 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 Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer?.
Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. 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 Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. 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 Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. 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 Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which of the following factors would increase the probability of knock in theCI engines?1. Long ignition delay of fuel2. High self ignition temperature of fuel3. Low volatility of fuelSelect the correct answer using the codes given below:a)1, 2 and 3b)1 and 2c)1 and 3d)2 and 3.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup