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Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' and
the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:
Codes:
(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
the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:
Codes:
(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
Statement (I) : Specific output of a SI engine is higher than the CI engine
Statement (II): Its higher engine mixture result in ability to burn richer mixture result in increased
energy conversion rate.
Statement (II): Its higher engine mixture result in ability to burn richer mixture result in increased
energy conversion rate.
- a)A
- b)B
- c)C
- d)D
Correct answer is option 'B'. Can you explain this answer?
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Direction: Each of the next consists of two statements, one labeled as...
Assertion (A): Specific output of a SI engine is higher than the CI engine.
Reason (R): Its higher engine mixture result in ability to burn richer mixture result in increased energy conversion rate.
The correct answer is option B, which states that both the Assertion (A) and the Reason (R) are individually true, but the Reason (R) is not the correct explanation of the Assertion (A).
Explanation:
Specific Output of SI Engine vs CI Engine:
- The specific output of an engine refers to the power output per unit displacement or unit mass of fuel consumed.
- In a Spark Ignition (SI) engine, the fuel-air mixture is ignited by a spark plug, and the combustion of the mixture produces power. SI engines typically use gasoline as fuel.
- In a Compression Ignition (CI) engine, the fuel is ignited by the heat generated by the compression of the air-fuel mixture. CI engines typically use diesel as fuel.
Reason for Higher Specific Output in SI Engine:
- The Reason (R) states that the higher engine mixture in an SI engine results in the ability to burn a richer mixture and leads to an increased energy conversion rate.
- This reason is not correct because a richer mixture does not necessarily lead to an increased energy conversion rate. In fact, for SI engines, the optimal air-fuel ratio (mixture) for maximum power output is typically around stoichiometric (chemically balanced) or slightly lean.
- SI engines are designed to operate at a specific air-fuel ratio to ensure complete combustion and efficient energy conversion. A rich mixture can lead to incomplete combustion, increased fuel consumption, and increased emissions.
- The specific output of SI engines is generally higher than CI engines due to their higher operating speeds, higher compression ratios, and more efficient combustion processes.
Comparison between SI and CI Engines:
- SI engines have higher specific output compared to CI engines due to their higher operating speeds, which result in more power strokes per unit time.
- CI engines have higher thermal efficiency compared to SI engines due to their higher compression ratios, which result in better combustion efficiency and reduced heat losses.
- SI engines are generally used in passenger cars, motorcycles, and small vehicles, where high power output and fast acceleration are required.
- CI engines are used in heavy-duty vehicles, such as trucks and buses, where high torque and fuel efficiency are important.
Conclusion:
- The specific output of a SI engine is indeed higher than a CI engine due to various factors such as operating speeds, compression ratios, and combustion processes.
- However, the reason provided in the statement is not correct, as a richer mixture does not necessarily lead to an increased energy conversion rate. The optimal air-fuel ratio for SI engines is typically stoichiometric or slightly lean for maximum power output.
Reason (R): Its higher engine mixture result in ability to burn richer mixture result in increased energy conversion rate.
The correct answer is option B, which states that both the Assertion (A) and the Reason (R) are individually true, but the Reason (R) is not the correct explanation of the Assertion (A).
Explanation:
Specific Output of SI Engine vs CI Engine:
- The specific output of an engine refers to the power output per unit displacement or unit mass of fuel consumed.
- In a Spark Ignition (SI) engine, the fuel-air mixture is ignited by a spark plug, and the combustion of the mixture produces power. SI engines typically use gasoline as fuel.
- In a Compression Ignition (CI) engine, the fuel is ignited by the heat generated by the compression of the air-fuel mixture. CI engines typically use diesel as fuel.
Reason for Higher Specific Output in SI Engine:
- The Reason (R) states that the higher engine mixture in an SI engine results in the ability to burn a richer mixture and leads to an increased energy conversion rate.
- This reason is not correct because a richer mixture does not necessarily lead to an increased energy conversion rate. In fact, for SI engines, the optimal air-fuel ratio (mixture) for maximum power output is typically around stoichiometric (chemically balanced) or slightly lean.
- SI engines are designed to operate at a specific air-fuel ratio to ensure complete combustion and efficient energy conversion. A rich mixture can lead to incomplete combustion, increased fuel consumption, and increased emissions.
- The specific output of SI engines is generally higher than CI engines due to their higher operating speeds, higher compression ratios, and more efficient combustion processes.
Comparison between SI and CI Engines:
- SI engines have higher specific output compared to CI engines due to their higher operating speeds, which result in more power strokes per unit time.
- CI engines have higher thermal efficiency compared to SI engines due to their higher compression ratios, which result in better combustion efficiency and reduced heat losses.
- SI engines are generally used in passenger cars, motorcycles, and small vehicles, where high power output and fast acceleration are required.
- CI engines are used in heavy-duty vehicles, such as trucks and buses, where high torque and fuel efficiency are important.
Conclusion:
- The specific output of a SI engine is indeed higher than a CI engine due to various factors such as operating speeds, compression ratios, and combustion processes.
- However, the reason provided in the statement is not correct, as a richer mixture does not necessarily lead to an increased energy conversion rate. The optimal air-fuel ratio for SI engines is typically stoichiometric or slightly lean for maximum power output.
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Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. Can you explain this answer?
Question Description
Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. 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 Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. 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 Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. Can you explain this answer?.
Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. 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 Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. 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 Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' andthe other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:Codes:(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 trueStatement (I) : Specific output of a SI engine is higher than the CI engineStatement (II): Its higher engine mixture result in ability to burn richer mixture result in increasedenergy conversion rate.a)Ab)Bc)Cd)DCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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