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Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.
Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Iso-octane has been chosen as the reference for S.I. en...
Ans. (a) Both assertion and reason given are true. Also the reason R is the correct
explanation of the assertion.
explanation of the assertion.
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Assertion (A): Iso-octane has been chosen as the reference for S.I. en...
Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and has been assigned a value of octane number 100.
Reason (R): Among the fuels, iso-octane ensures the highest compression ratio at which an S.I. engine can be operated without knocking.
Explanation:
A: Iso-octane, also known as 2,2,4-trimethylpentane, has been chosen as the reference fuel for spark ignition (S.I.) engines. It is a highly branched hydrocarbon compound and exhibits properties that are representative of high-quality gasoline fuels. The octane number of a fuel indicates its resistance to knock, which is an undesirable phenomenon in S.I. engines. Higher octane numbers indicate better knock resistance. Therefore, iso-octane, with an assigned octane number of 100, represents the best possible knock resistance for S.I. engine fuels.
R: Knocking in S.I. engines refers to the undesirable occurrence of uncontrolled combustion of the air-fuel mixture in the engine cylinder. It produces a knocking sound and can cause engine damage if not controlled. The tendency of a fuel to knock is directly related to its ability to resist auto-ignition under high-pressure conditions. Fuels with lower octane numbers have lower resistance to knock and are more likely to cause knocking in the engine.
Iso-octane ensures the highest compression ratio at which an S.I. engine can be operated without knocking. This means that when iso-octane is used as a fuel, the engine can be operated with a higher compression ratio, resulting in improved efficiency and power output without the risk of knocking. The high knock resistance of iso-octane allows for increased compression ratios and more efficient combustion, leading to better performance of the S.I. engine.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) correctly explains Assertion (A). Iso-octane's selection as the reference fuel with an octane number of 100 is based on its ability to ensure the highest compression ratio at which an S.I. engine can operate without knocking.
Reason (R): Among the fuels, iso-octane ensures the highest compression ratio at which an S.I. engine can be operated without knocking.
Explanation:
A: Iso-octane, also known as 2,2,4-trimethylpentane, has been chosen as the reference fuel for spark ignition (S.I.) engines. It is a highly branched hydrocarbon compound and exhibits properties that are representative of high-quality gasoline fuels. The octane number of a fuel indicates its resistance to knock, which is an undesirable phenomenon in S.I. engines. Higher octane numbers indicate better knock resistance. Therefore, iso-octane, with an assigned octane number of 100, represents the best possible knock resistance for S.I. engine fuels.
R: Knocking in S.I. engines refers to the undesirable occurrence of uncontrolled combustion of the air-fuel mixture in the engine cylinder. It produces a knocking sound and can cause engine damage if not controlled. The tendency of a fuel to knock is directly related to its ability to resist auto-ignition under high-pressure conditions. Fuels with lower octane numbers have lower resistance to knock and are more likely to cause knocking in the engine.
Iso-octane ensures the highest compression ratio at which an S.I. engine can be operated without knocking. This means that when iso-octane is used as a fuel, the engine can be operated with a higher compression ratio, resulting in improved efficiency and power output without the risk of knocking. The high knock resistance of iso-octane allows for increased compression ratios and more efficient combustion, leading to better performance of the S.I. engine.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) correctly explains Assertion (A). Iso-octane's selection as the reference fuel with an octane number of 100 is based on its ability to ensure the highest compression ratio at which an S.I. engine can operate without knocking.
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Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
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Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. 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 Assertion (A): Iso-octane has been chosen as the reference for S.I. engine fuels and hasbeen assigned a value of octane number 100.Reason (R): Among the fuels, iso-octane ensures the highest compression ratio atwhich an S.I. engine can be operated without knocking.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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