Mechanical Engineering Exam > Mechanical Engineering Questions > Which of the following statement is wrong?a)A...
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Which of the following statement is wrong?
- a)A steel with 0.8 % carbon is wholly pearlite
- b)The amount of cementite increases with the increase in percentage of carbon in iron.
- c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.
- d)The cementite is identified as round particles in the structure
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statement is wrong?a)A steel with 0.8 % carbon ...
Understanding the Incorrect Statement
The correct answer is option 'C,' which states: "A mechanical mixture of 87% cementite and 13% ferrite is called pearlite." This statement is incorrect for the following reasons:
Composition of Pearlite
- Pearlite is not a direct mechanical mixture of cementite (Fe₃C) and ferrite (α-iron).
- Instead, it is a layered structure consisting of alternating lamellae of ferrite and cementite.
- The typical composition of pearlite is about 0.76% carbon, which is much lower than the stated 87% cementite and 13% ferrite.
Understanding Cementite and Ferrite
- Cementite is a hard and brittle intermetallic compound, while ferrite is soft and ductile.
- In pearlite, the alternating layers contribute to a balance of strength and ductility, which is essential for many steel applications.
Clarifying the Other Statements
- Statement A: A steel with 0.8% carbon does exhibit a microstructure primarily composed of pearlite, especially when cooled slowly.
- Statement B: The amount of cementite indeed increases with the carbon content in iron, as higher carbon contents lead to more cementite formation.
- Statement D: Cementite does appear as round particles in specific microstructures, but its distribution can vary.
In summary, the confusion arises from the mischaracterization of pearlite as a simple mixture rather than a distinct microstructure formed by a specific arrangement of ferrite and cementite.
The correct answer is option 'C,' which states: "A mechanical mixture of 87% cementite and 13% ferrite is called pearlite." This statement is incorrect for the following reasons:
Composition of Pearlite
- Pearlite is not a direct mechanical mixture of cementite (Fe₃C) and ferrite (α-iron).
- Instead, it is a layered structure consisting of alternating lamellae of ferrite and cementite.
- The typical composition of pearlite is about 0.76% carbon, which is much lower than the stated 87% cementite and 13% ferrite.
Understanding Cementite and Ferrite
- Cementite is a hard and brittle intermetallic compound, while ferrite is soft and ductile.
- In pearlite, the alternating layers contribute to a balance of strength and ductility, which is essential for many steel applications.
Clarifying the Other Statements
- Statement A: A steel with 0.8% carbon does exhibit a microstructure primarily composed of pearlite, especially when cooled slowly.
- Statement B: The amount of cementite indeed increases with the carbon content in iron, as higher carbon contents lead to more cementite formation.
- Statement D: Cementite does appear as round particles in specific microstructures, but its distribution can vary.
In summary, the confusion arises from the mischaracterization of pearlite as a simple mixture rather than a distinct microstructure formed by a specific arrangement of ferrite and cementite.
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Which of the following statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. Can you explain this answer?
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Which of the following statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. 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 statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. 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 statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. Can you explain this answer?.
Which of the following statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. 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 statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. 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 statement is wrong?a)A steel with 0.8 % carbon is wholly pearliteb)The amount of cementite increases with the increase in percentage of carbon in iron.c)A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.d)The cementite is identified as round particles in the structureCorrect answer is option 'C'. Can you explain this answer?.
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