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Assertion (A): Cast iron is generally hard, brittle and wear resistant.
Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.
Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.
- 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): Cast iron is generally hard, brittle and wear resistant...
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Assertion (A): Cast iron is generally hard, brittle and wear resistant...
Assertion (A): Cast iron is generally hard, brittle, and wear-resistant.
Reason (R): Cast iron contains more than 2% carbon and as such, the percentage of cementite in it is higher.
Explanation:
Cast Iron:
- Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%.
- It is named so because it is cast into molds to produce various shapes and sizes.
- Cast iron is widely used in engineering applications due to its desirable properties such as high hardness, good castability, excellent wear resistance, and low cost.
Assertion (A): Cast iron is generally hard, brittle, and wear-resistant.
- Cast iron is known for its hardness, which is primarily due to the presence of carbon in the alloy.
- The carbon content in cast iron is typically between 2% and 4%, which is much higher than in other forms of iron.
- The high carbon content promotes the formation of a hard and brittle phase called cementite (Fe3C) in the microstructure of cast iron.
- The presence of cementite makes cast iron hard and brittle, contributing to its wear resistance.
Reason (R): Cast iron contains more than 2% carbon and as such, the percentage of cementite in it is higher.
- Reason (R) correctly states that cast iron contains more than 2% carbon.
- The percentage of carbon in cast iron can range from 2% to 4% or even higher, depending on the specific alloy composition.
- The higher carbon content leads to a higher percentage of cementite in the microstructure of cast iron.
- Cementite is a hard and brittle phase that contributes to the overall hardness and wear resistance of cast iron.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) is the correct explanation of Assertion (A).
- The high carbon content in cast iron leads to the formation of cementite, which imparts hardness, brittleness, and wear resistance to the material.
- Therefore, the correct answer is option A.
Reason (R): Cast iron contains more than 2% carbon and as such, the percentage of cementite in it is higher.
Explanation:
Cast Iron:
- Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%.
- It is named so because it is cast into molds to produce various shapes and sizes.
- Cast iron is widely used in engineering applications due to its desirable properties such as high hardness, good castability, excellent wear resistance, and low cost.
Assertion (A): Cast iron is generally hard, brittle, and wear-resistant.
- Cast iron is known for its hardness, which is primarily due to the presence of carbon in the alloy.
- The carbon content in cast iron is typically between 2% and 4%, which is much higher than in other forms of iron.
- The high carbon content promotes the formation of a hard and brittle phase called cementite (Fe3C) in the microstructure of cast iron.
- The presence of cementite makes cast iron hard and brittle, contributing to its wear resistance.
Reason (R): Cast iron contains more than 2% carbon and as such, the percentage of cementite in it is higher.
- Reason (R) correctly states that cast iron contains more than 2% carbon.
- The percentage of carbon in cast iron can range from 2% to 4% or even higher, depending on the specific alloy composition.
- The higher carbon content leads to a higher percentage of cementite in the microstructure of cast iron.
- Cementite is a hard and brittle phase that contributes to the overall hardness and wear resistance of cast iron.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) is the correct explanation of Assertion (A).
- The high carbon content in cast iron leads to the formation of cementite, which imparts hardness, brittleness, and wear resistance to the material.
- Therefore, the correct answer is option A.
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Assertion (A): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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): Cast iron is generally hard, brittle and wear resistant.Reason (R): Cast iron contains more than 2% carbon and as such the percentagecementite in it is higher.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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