Mechanical Engineering Exam > Mechanical Engineering Questions > All of the following parameters reduce knocki...
Start Learning for Free
All of the following parameters reduce knocking tendency in a compression ignition engine, except
- a)high inlet pressure and temperature
- b)higher compression ratio
- c)large engine size
- d)early injection of fuel
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
All of the following parameters reduce knocking tendency in a compress...
The delay period increases with increase in injection advance which favour knocking tendency.
Most Upvoted Answer
All of the following parameters reduce knocking tendency in a compress...
Understanding Knocking in Compression Ignition Engines
Knocking, or diesel knock, occurs in compression ignition (CI) engines when fuel ignites prematurely, leading to noise and potential damage. Several parameters influence knocking tendency.
Factors Reducing Knocking Tendency:
- High Inlet Pressure and Temperature:
- Increasing inlet pressure and temperature enhances air-fuel mixture quality.
- This results in more complete combustion, diminishing the likelihood of premature ignition.
- Higher Compression Ratio:
- A higher compression ratio increases the thermal efficiency of the engine.
- It allows for more efficient combustion, thereby reducing the chances of knocking.
- Large Engine Size:
- Larger engines often operate at lower specific loads, which can help mitigate knocking.
- They can handle larger fuel quantities without the risk of early ignition.
Why Early Injection of Fuel Increases Knocking Tendency:
- Premature Ignition:
- Early fuel injection can lead to a situation where the fuel ignites before the piston reaches the optimal compression point.
- This can cause significant pressure fluctuations and increased noise, characteristic of knocking.
- Reduced Control over Combustion:
- Injecting fuel too early makes it challenging to control the combustion timing.
- This unpredictability can lead to inefficient combustion and increased knocking.
In conclusion, while options A, B, and C help reduce knocking tendency in CI engines, option D (early injection of fuel) exacerbates the problem, making it the correct answer to the question.
Knocking, or diesel knock, occurs in compression ignition (CI) engines when fuel ignites prematurely, leading to noise and potential damage. Several parameters influence knocking tendency.
Factors Reducing Knocking Tendency:
- High Inlet Pressure and Temperature:
- Increasing inlet pressure and temperature enhances air-fuel mixture quality.
- This results in more complete combustion, diminishing the likelihood of premature ignition.
- Higher Compression Ratio:
- A higher compression ratio increases the thermal efficiency of the engine.
- It allows for more efficient combustion, thereby reducing the chances of knocking.
- Large Engine Size:
- Larger engines often operate at lower specific loads, which can help mitigate knocking.
- They can handle larger fuel quantities without the risk of early ignition.
Why Early Injection of Fuel Increases Knocking Tendency:
- Premature Ignition:
- Early fuel injection can lead to a situation where the fuel ignites before the piston reaches the optimal compression point.
- This can cause significant pressure fluctuations and increased noise, characteristic of knocking.
- Reduced Control over Combustion:
- Injecting fuel too early makes it challenging to control the combustion timing.
- This unpredictability can lead to inefficient combustion and increased knocking.
In conclusion, while options A, B, and C help reduce knocking tendency in CI engines, option D (early injection of fuel) exacerbates the problem, making it the correct answer to the question.
|
Explore Courses for Mechanical Engineering exam
|
|
Top Courses for Mechanical EngineeringView all
Question Description
All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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 All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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 All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer?.
All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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 All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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 All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer?.
Solutions for All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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 All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice All of the following parameters reduce knocking tendency in a compression ignition engine, excepta)high inlet pressure and temperatureb)higher compression ratioc)large engine sized)early injection of fuelCorrect 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!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup