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Which of the following assumptions are correct for cold rolling?
1. The material is plastic.
2. The arc of contact is circular with a radius greater than the radius of the roll.
3. Coefficient of friction is constant over the arc of contact and acts in one direction
throughout the arc of contact.
1. The material is plastic.
2. The arc of contact is circular with a radius greater than the radius of the roll.
3. Coefficient of friction is constant over the arc of contact and acts in one direction
throughout the arc of contact.
Q.
Select the correct answer using the codes given below:Codes:
- a)1 and 2
- b)1 and 3
- c)2 and 3
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Which of the following assumptions are correct for cold rolling?1. The...
The correct assumptions for cold rolling are:
1. The material is plastic:
- This assumption is correct because cold rolling involves deforming the material by applying compressive forces. In order for the material to undergo plastic deformation, it must have a yield strength higher than the applied forces. Therefore, the material must be plastic in nature.
2. The arc of contact is circular with a radius greater than the radius of the roll:
- This assumption is correct because during cold rolling, the material is passed through a pair of rolls that have a cylindrical shape. The contact between the rolls and the material forms an arc, and this arc is assumed to be circular. Moreover, the radius of this circular arc is greater than the radius of the roll itself.
3. Coefficient of friction is constant over the arc of contact and acts in one direction throughout the arc of contact:
- This assumption is correct because the coefficient of friction plays a crucial role in determining the rolling process. It affects the amount of force required for rolling and the resulting surface finish of the material. In cold rolling, it is assumed that the coefficient of friction remains constant over the arc of contact between the rolls and the material. Additionally, it is assumed that the direction of frictional force remains the same throughout the arc of contact.
Explanation of the correct answer:
The correct answer is option 'D' because all of the given assumptions are correct for cold rolling. These assumptions are fundamental to the understanding and analysis of the cold rolling process. By assuming that the material is plastic, the arc of contact is circular with a greater radius than the roll, and the coefficient of friction is constant and acts in one direction throughout the arc of contact, engineers and researchers can develop models and equations to predict the behavior of the material during cold rolling. These assumptions allow for the calculation of forces, power requirements, and the prediction of the final shape and properties of the rolled material. Hence, option 'D' is the correct answer.
1. The material is plastic:
- This assumption is correct because cold rolling involves deforming the material by applying compressive forces. In order for the material to undergo plastic deformation, it must have a yield strength higher than the applied forces. Therefore, the material must be plastic in nature.
2. The arc of contact is circular with a radius greater than the radius of the roll:
- This assumption is correct because during cold rolling, the material is passed through a pair of rolls that have a cylindrical shape. The contact between the rolls and the material forms an arc, and this arc is assumed to be circular. Moreover, the radius of this circular arc is greater than the radius of the roll itself.
3. Coefficient of friction is constant over the arc of contact and acts in one direction throughout the arc of contact:
- This assumption is correct because the coefficient of friction plays a crucial role in determining the rolling process. It affects the amount of force required for rolling and the resulting surface finish of the material. In cold rolling, it is assumed that the coefficient of friction remains constant over the arc of contact between the rolls and the material. Additionally, it is assumed that the direction of frictional force remains the same throughout the arc of contact.
Explanation of the correct answer:
The correct answer is option 'D' because all of the given assumptions are correct for cold rolling. These assumptions are fundamental to the understanding and analysis of the cold rolling process. By assuming that the material is plastic, the arc of contact is circular with a greater radius than the roll, and the coefficient of friction is constant and acts in one direction throughout the arc of contact, engineers and researchers can develop models and equations to predict the behavior of the material during cold rolling. These assumptions allow for the calculation of forces, power requirements, and the prediction of the final shape and properties of the rolled material. Hence, option 'D' is the correct answer.
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Which of the following assumptions are correct for cold rolling?1. The...
A
Friction direction changes after neutral point
Friction direction changes after neutral point
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Which of the following assumptions are correct for cold rolling?1. The material is plastic.2. The arc of contact is circular with a radius greater than the radius of the roll.3. Coefficient of friction is constant over the arc of contact and acts in one directionthroughout the arc of contact.Q.Select the correct answer using the codes given below:Codes:a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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Which of the following assumptions are correct for cold rolling?1. The material is plastic.2. The arc of contact is circular with a radius greater than the radius of the roll.3. Coefficient of friction is constant over the arc of contact and acts in one directionthroughout the arc of contact.Q.Select the correct answer using the codes given below:Codes:a)1 and 2b)1 and 3c)2 and 3d)1, 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 Which of the following assumptions are correct for cold rolling?1. The material is plastic.2. The arc of contact is circular with a radius greater than the radius of the roll.3. Coefficient of friction is constant over the arc of contact and acts in one directionthroughout the arc of contact.Q.Select the correct answer using the codes given below:Codes:a)1 and 2b)1 and 3c)2 and 3d)1, 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 Which of the following assumptions are correct for cold rolling?1. The material is plastic.2. The arc of contact is circular with a radius greater than the radius of the roll.3. Coefficient of friction is constant over the arc of contact and acts in one directionthroughout the arc of contact.Q.Select the correct answer using the codes given below:Codes:a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?.
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