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Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools
1. Increases the hardness.
2. Decreases the hardness.
3. Increases the transverse rupture strength
4. Lowers the transverse rupture strength.
Which of the statements given above are correct?
1. Increases the hardness.
2. Decreases the hardness.
3. Increases the transverse rupture strength
4. Lowers the transverse rupture strength.
Which of the statements given above are correct?
- a)1 and 3
- b)2 and 4
- c)1 and 4
- d)2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements: An increase in the cobalt content i...
Ans. (d)
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Consider the following statements: An increase in the cobalt content i...
Explanation:
To understand the correct statements, let's first understand the effect of cobalt content on the properties of carbide tools.
Effect of Cobalt Content:
Cobalt is added to carbide tools as a binder phase. It helps in holding the carbide particles together and provides toughness and resistance to chipping. The amount of cobalt in carbide tools can affect their hardness and transverse rupture strength.
1. Increases the hardness:
This statement is incorrect. The increase in cobalt content does not directly increase the hardness of carbide tools. The hardness of carbide tools mainly depends on the type and size of carbide particles used. Higher cobalt content can affect the toughness and wear resistance of the tools but not the hardness.
2. Decreases the hardness:
This statement is correct. Increased cobalt content can lead to a decrease in the hardness of carbide tools. This is because cobalt is softer than carbide and its presence can lower the overall hardness of the tool.
3. Increases the transverse rupture strength:
This statement is correct. The transverse rupture strength of carbide tools is a measure of their resistance to breaking or fracturing under bending or twisting forces. With an increase in cobalt content, the transverse rupture strength of carbide tools tends to increase. This is because cobalt improves the toughness and resistance to chipping, thereby increasing the tool's ability to withstand bending and twisting forces.
4. Lowers the transverse rupture strength:
This statement is incorrect. As mentioned earlier, an increase in cobalt content generally leads to an increase in the transverse rupture strength of carbide tools. Higher cobalt content improves the toughness and resistance to chipping, making the tool less likely to break under bending or twisting forces.
Therefore, the correct statements are:
- 2. Decreases the hardness.
- 3. Increases the transverse rupture strength.
Hence, option D (2 and 3) is the correct answer.
To understand the correct statements, let's first understand the effect of cobalt content on the properties of carbide tools.
Effect of Cobalt Content:
Cobalt is added to carbide tools as a binder phase. It helps in holding the carbide particles together and provides toughness and resistance to chipping. The amount of cobalt in carbide tools can affect their hardness and transverse rupture strength.
1. Increases the hardness:
This statement is incorrect. The increase in cobalt content does not directly increase the hardness of carbide tools. The hardness of carbide tools mainly depends on the type and size of carbide particles used. Higher cobalt content can affect the toughness and wear resistance of the tools but not the hardness.
2. Decreases the hardness:
This statement is correct. Increased cobalt content can lead to a decrease in the hardness of carbide tools. This is because cobalt is softer than carbide and its presence can lower the overall hardness of the tool.
3. Increases the transverse rupture strength:
This statement is correct. The transverse rupture strength of carbide tools is a measure of their resistance to breaking or fracturing under bending or twisting forces. With an increase in cobalt content, the transverse rupture strength of carbide tools tends to increase. This is because cobalt improves the toughness and resistance to chipping, thereby increasing the tool's ability to withstand bending and twisting forces.
4. Lowers the transverse rupture strength:
This statement is incorrect. As mentioned earlier, an increase in cobalt content generally leads to an increase in the transverse rupture strength of carbide tools. Higher cobalt content improves the toughness and resistance to chipping, making the tool less likely to break under bending or twisting forces.
Therefore, the correct statements are:
- 2. Decreases the hardness.
- 3. Increases the transverse rupture strength.
Hence, option D (2 and 3) is the correct answer.
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Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools1. Increases the hardness.2. Decreases the hardness.3. Increases the transverse rupture strength4. Lowers the transverse rupture strength.Which of the statements given above are correct?a)1 and 3b)2 and 4c)1 and 4d)2 and 3Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools1. Increases the hardness.2. Decreases the hardness.3. Increases the transverse rupture strength4. Lowers the transverse rupture strength.Which of the statements given above are correct?a)1 and 3b)2 and 4c)1 and 4d)2 and 3Correct answer is option 'D'. 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 Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools1. Increases the hardness.2. Decreases the hardness.3. Increases the transverse rupture strength4. Lowers the transverse rupture strength.Which of the statements given above are correct?a)1 and 3b)2 and 4c)1 and 4d)2 and 3Correct answer is option 'D'. 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 Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools1. Increases the hardness.2. Decreases the hardness.3. Increases the transverse rupture strength4. Lowers the transverse rupture strength.Which of the statements given above are correct?a)1 and 3b)2 and 4c)1 and 4d)2 and 3Correct answer is option 'D'. Can you explain this answer?.
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