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Which of the following statements is "true"?
- a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engine
- b)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition engine
- c)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engine
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Which of the following statements is "true"?a)The term "KN...
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Which of the following statements is "true"?a)The term "KN...
Statement: The term KNOCK is used for an identical phenomenon in a spark ignition and compression ignition engine.
Explanation:
To understand the statement, let's first define what knock is in the context of internal combustion engines.
What is Knock?
Knock, also known as detonation, is an undesirable phenomenon that occurs in internal combustion engines. It refers to the uncontrolled combustion of the fuel-air mixture in the combustion chamber, causing a rapid increase in pressure and temperature. This can lead to engine damage and reduced performance.
Spark Ignition Engine:
In a spark ignition engine, the air-fuel mixture is ignited by a spark plug. The combustion process starts with the spark plug igniting the mixture near the spark plug location. The flame front then propagates across the combustion chamber, burning the remaining mixture.
Compression Ignition Engine:
In a compression ignition engine, also known as a diesel engine, the air is compressed to a high pressure and temperature, causing the fuel to autoignite when injected into the combustion chamber. Unlike a spark ignition engine, there are no spark plugs in a compression ignition engine.
Comparison of Knock in Spark Ignition and Compression Ignition Engines:
Now, let's compare the occurrence of knock in both types of engines based on the given options:
a) The term KNOCK is used for an identical phenomenon in a spark ignition and compression ignition engine.
This statement is true. Knock, or detonation, can occur in both spark ignition and compression ignition engines. In a spark ignition engine, knock usually occurs in the early part of combustion when the flame front encounters pockets of unburned mixture. In a compression ignition engine, knock occurs in the later part of combustion due to the autoignition of the fuel.
b) Knock is a term associated with a phenomenon taking place in the early part of combustion in a spark ignition engine and the later part of combustion in a spark ignition engine.
This statement is incorrect. It seems to be a repetition of the previous statement with a typo.
c) Knock is a term associated with a phenomenon taking place in the early part of combustion in a spark ignition engine and the later part of combustion in a compression ignition engine.
This statement is incorrect. The occurrence of knock is reversed in the two types of engines. Knock occurs in the early part of combustion in a spark ignition engine and in the later part of combustion in a compression ignition engine.
d) None of the above.
This statement is incorrect since option 'A' is the correct answer.
Conclusion:
The true statement is option 'A'. Knock can occur in both spark ignition and compression ignition engines, although the occurrence and characteristics of knock differ between the two types of engines.
Explanation:
To understand the statement, let's first define what knock is in the context of internal combustion engines.
What is Knock?
Knock, also known as detonation, is an undesirable phenomenon that occurs in internal combustion engines. It refers to the uncontrolled combustion of the fuel-air mixture in the combustion chamber, causing a rapid increase in pressure and temperature. This can lead to engine damage and reduced performance.
Spark Ignition Engine:
In a spark ignition engine, the air-fuel mixture is ignited by a spark plug. The combustion process starts with the spark plug igniting the mixture near the spark plug location. The flame front then propagates across the combustion chamber, burning the remaining mixture.
Compression Ignition Engine:
In a compression ignition engine, also known as a diesel engine, the air is compressed to a high pressure and temperature, causing the fuel to autoignite when injected into the combustion chamber. Unlike a spark ignition engine, there are no spark plugs in a compression ignition engine.
Comparison of Knock in Spark Ignition and Compression Ignition Engines:
Now, let's compare the occurrence of knock in both types of engines based on the given options:
a) The term KNOCK is used for an identical phenomenon in a spark ignition and compression ignition engine.
This statement is true. Knock, or detonation, can occur in both spark ignition and compression ignition engines. In a spark ignition engine, knock usually occurs in the early part of combustion when the flame front encounters pockets of unburned mixture. In a compression ignition engine, knock occurs in the later part of combustion due to the autoignition of the fuel.
b) Knock is a term associated with a phenomenon taking place in the early part of combustion in a spark ignition engine and the later part of combustion in a spark ignition engine.
This statement is incorrect. It seems to be a repetition of the previous statement with a typo.
c) Knock is a term associated with a phenomenon taking place in the early part of combustion in a spark ignition engine and the later part of combustion in a compression ignition engine.
This statement is incorrect. The occurrence of knock is reversed in the two types of engines. Knock occurs in the early part of combustion in a spark ignition engine and in the later part of combustion in a compression ignition engine.
d) None of the above.
This statement is incorrect since option 'A' is the correct answer.
Conclusion:
The true statement is option 'A'. Knock can occur in both spark ignition and compression ignition engines, although the occurrence and characteristics of knock differ between the two types of engines.
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Which of the following statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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Which of the following statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect 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 statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect 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 statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect answer is option 'A'. Can you explain this answer?.
Which of the following statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect 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 statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect 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 statements is "true"?a)The term "KNOCK" is used for on identical phenomenon in a spark ignition andcompression ignition engineb)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a sparkignition enginec)"KNOCK" is a term associated with a phenomenon taking place in the early part ofcombustion in a spark ignition engine and the later part of combustion in a compressionignition engined)None of the aboveCorrect answer is option 'A'. Can you explain this answer?.
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