Mechanical Engineering Exam > Mechanical Engineering Questions > Assertion (A): Aluminium has poor weldability...
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Assertion (A): Aluminium has poor weldability.
Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R arc true but R is NOT the correct explanation of A
- c)A is true hut R is false
- d)A is false but R is true
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Assertion (A): Aluminium has poor weldability. Reason (R): Alumi...
Explanation:
Aluminium is a widely used metal in industries due to its low density, high corrosion resistance, and good thermal conductivity. However, it is not an easy metal to weld. The given assertion and reason can be explained as follows:
A. Poor Weldability of Aluminium:
Aluminium has poor weldability due to the following reasons:
R. High Thermal Conductivity and Affinity to Oxygen:
High thermal conductivity and high affinity to oxygen are the reasons for poor weldability of aluminium. The high thermal conductivity of aluminium makes it difficult to maintain a high-temperature gradient required for welding. The high affinity to oxygen results in the formation of an oxide layer on the surface of the metal, which can prevent proper fusion during welding.
Conclusion:
Both assertion and reason are true, but the reason is not the correct explanation of the assertion. While high thermal conductivity and high affinity to oxygen are the reasons for poor weldability of aluminium, other factors such as low melting point, coefficient of thermal expansion, and softness of the metal also contribute to the poor weldability. Therefore, option (b) is the correct answer.
Aluminium is a widely used metal in industries due to its low density, high corrosion resistance, and good thermal conductivity. However, it is not an easy metal to weld. The given assertion and reason can be explained as follows:
A. Poor Weldability of Aluminium:
Aluminium has poor weldability due to the following reasons:
- Aluminium has a high thermal conductivity, which makes it difficult to maintain a high-temperature gradient required for welding.
- Aluminium has a high affinity to oxygen, which can result in the formation of an oxide layer on the surface of the metal and can prevent proper fusion during welding.
- Aluminium has a low melting point, which can result in burn-through during welding.
- Aluminium has a high coefficient of thermal expansion, which can result in distortion and cracking of the welded joints.
- Aluminium is a soft metal, which can result in deformation during welding.
R. High Thermal Conductivity and Affinity to Oxygen:
High thermal conductivity and high affinity to oxygen are the reasons for poor weldability of aluminium. The high thermal conductivity of aluminium makes it difficult to maintain a high-temperature gradient required for welding. The high affinity to oxygen results in the formation of an oxide layer on the surface of the metal, which can prevent proper fusion during welding.
Conclusion:
Both assertion and reason are true, but the reason is not the correct explanation of the assertion. While high thermal conductivity and high affinity to oxygen are the reasons for poor weldability of aluminium, other factors such as low melting point, coefficient of thermal expansion, and softness of the metal also contribute to the poor weldability. Therefore, option (b) is the correct answer.
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Assertion (A): Aluminium has poor weldability. Reason (R): Alumi...
The correct answer is both A and R are true but R is NOT the correct explanation of A. Assertion (A): Aluminium has poor weldability is true. Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen is also true but is not the correct explanation of A as aluminum's high affinity to oxygen is the main reason for its poor weldability, not its high thermal conductivity.
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Assertion (A): Aluminium has poor weldability. Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer?
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Assertion (A): Aluminium has poor weldability. Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect 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 Assertion (A): Aluminium has poor weldability. Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect 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 Assertion (A): Aluminium has poor weldability. Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer?.
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