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Consider the following statements
1. A round bar in a round hole form a turning pair.
2. A square bar in a square hole forms a sliding pair.
3. A vertical shaft in a footstep bearing forms a successful constraint.
Of these statements
[IES-2000]
  • a)
    1 and 2 are correct
  • b)
    1 and 3 are correct
  • c)
    2 and 3 are correct
  • d)
    1, 2 and 3 are correct
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following statements1. A round bar in a round hole form a...
If round bar is placed in a round hole it will have both turning and as well as sliding pair also.
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Most Upvoted Answer
Consider the following statements1. A round bar in a round hole form a...
Mechanical Engineering: Theory of Machines

Explanation:

Turning Pair:
- When two links or elements have a surface contact with each other, and one is turning about a stationary axis while the other is turning around a moving axis, they form a turning pair.
- Examples: a round bar in a round hole, a cylindrical cam and a flat-faced follower, etc.

Sliding Pair:
- When two links or elements have a surface contact with each other, and one is moving linearly or translationally, while the other is stationary, they form a sliding pair.
- Examples: a square bar in a square hole, a piston and cylinder, etc.

Footstep Bearing:
- A footstep bearing is a type of journal bearing where the shaft or journal is supported by a flat or slightly rounded pad or foot that rests on a stationary surface or bearing.
- A successful constraint is one that prevents motion in a particular direction or degree of freedom.
- In a vertical shaft and footstep bearing arrangement, the footstep bearing provides a successful constraint against radial and axial motion of the shaft.

Given statements:
1. A round bar in a round hole form a turning pair.
- This statement is correct, as explained above.

2. A square bar in a square hole forms a sliding pair.
- This statement is correct, as explained above.

3. A vertical shaft in a footstep bearing forms a successful constraint.
- This statement is also correct, as explained above.

Therefore, option C, i.e., 2 and 3 are correct is the correct answer.
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Community Answer
Consider the following statements1. A round bar in a round hole form a...
If round bar is placed in a round hole it Wii have both turning and as well as sliding pair also. so option c is correct
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