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Consider the following statements:
Addition of silicon to cast iron
1. Promotes graphite module formation.
2. Promotes graphite flake formation.
3. Increases the fluidity of the molten metal.
4. Improves the ductility of cast iron.
Select the correct answer using the codes given below:
Addition of silicon to cast iron
1. Promotes graphite module formation.
2. Promotes graphite flake formation.
3. Increases the fluidity of the molten metal.
4. Improves the ductility of cast iron.
Select the correct answer using the codes given below:
- a)1and 4
- b)2 and 3
- c)1and 3
- d)3 and 4
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements:Addition of silicon to cast iron1. P...
Ans. (b)
Most Upvoted Answer
Consider the following statements:Addition of silicon to cast iron1. P...
**Explanation:**
To understand why option B is the correct answer, let's examine each statement individually:
1. **Promotes graphite module formation:** The addition of silicon to cast iron promotes the formation of graphite modules. Silicon has a strong affinity for carbon, and it combines with carbon to form silicon carbide (SiC). The SiC acts as a nucleation site for graphite formation, resulting in the formation of graphite modules. These graphite modules improve the strength and thermal conductivity of the cast iron.
2. **Promotes graphite flake formation:** This statement is incorrect. The addition of silicon to cast iron does not promote graphite flake formation. In fact, it has the opposite effect. Silicon promotes the formation of graphite modules, as mentioned in statement 1, rather than graphite flakes. Graphite flakes are formed when the cooling rate is slow and the carbon content is high. The presence of silicon helps to control the formation of graphite flakes and promotes the formation of graphite modules.
3. **Increases the fluidity of the molten metal:** The addition of silicon to cast iron increases the fluidity of the molten metal. Silicon has a lower melting point than iron, and it forms a eutectic mixture with iron. This eutectic mixture has a lower melting point than pure iron, resulting in improved fluidity. Increased fluidity allows for better fillability of complex-shaped molds and reduces the risk of defects such as shrinkage porosity.
4. **Improves the ductility of cast iron:** This statement is incorrect. The addition of silicon to cast iron does not improve the ductility of the material. In fact, it tends to decrease the ductility. Silicon increases the hardness and strength of cast iron but reduces its ductility. The presence of silicon alters the microstructure of cast iron, making it more brittle and less ductile.
Based on the above explanations, the correct answer is option B (2 and 3). The addition of silicon to cast iron promotes graphite module formation and increases the fluidity of the molten metal. It does not promote graphite flake formation and does not improve the ductility of cast iron.
To understand why option B is the correct answer, let's examine each statement individually:
1. **Promotes graphite module formation:** The addition of silicon to cast iron promotes the formation of graphite modules. Silicon has a strong affinity for carbon, and it combines with carbon to form silicon carbide (SiC). The SiC acts as a nucleation site for graphite formation, resulting in the formation of graphite modules. These graphite modules improve the strength and thermal conductivity of the cast iron.
2. **Promotes graphite flake formation:** This statement is incorrect. The addition of silicon to cast iron does not promote graphite flake formation. In fact, it has the opposite effect. Silicon promotes the formation of graphite modules, as mentioned in statement 1, rather than graphite flakes. Graphite flakes are formed when the cooling rate is slow and the carbon content is high. The presence of silicon helps to control the formation of graphite flakes and promotes the formation of graphite modules.
3. **Increases the fluidity of the molten metal:** The addition of silicon to cast iron increases the fluidity of the molten metal. Silicon has a lower melting point than iron, and it forms a eutectic mixture with iron. This eutectic mixture has a lower melting point than pure iron, resulting in improved fluidity. Increased fluidity allows for better fillability of complex-shaped molds and reduces the risk of defects such as shrinkage porosity.
4. **Improves the ductility of cast iron:** This statement is incorrect. The addition of silicon to cast iron does not improve the ductility of the material. In fact, it tends to decrease the ductility. Silicon increases the hardness and strength of cast iron but reduces its ductility. The presence of silicon alters the microstructure of cast iron, making it more brittle and less ductile.
Based on the above explanations, the correct answer is option B (2 and 3). The addition of silicon to cast iron promotes graphite module formation and increases the fluidity of the molten metal. It does not promote graphite flake formation and does not improve the ductility of cast iron.
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Consider the following statements:Addition of silicon to cast iron1. P...
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Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements:Addition of silicon to cast iron1. Promotes graphite module formation.2. Promotes graphite flake formation.3. Increases the fluidity of the molten metal.4. Improves the ductility of cast iron.Select the correct answer using the codes given below:a)1and 4b)2 and 3c)1and 3d)3 and 4Correct answer is option 'B'. Can you explain this answer?.
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