Correct Answer - Option 3 : 1-C, 2-D, 3-A, 4-B
Explanation:
Revolute Pair (R-pair): A revolute pair has one degree of freedom and permits a rotational motion about an axis. A revolute pair is often called a pin joint.
- Example: Lathe spindle in the headstock.
Helical Pair (H-pair) A helical pair has one degree of freedom and permits rotational and translational motion. These motions are, however, related by the pitch value of the helical pair. A helical pair is often called a screw pair
- Example: Motion between the bolt and fixed nut
Rolling pair: A pair of two links having a rolling motion relative to each other is called rolling pair
- Example: Ball bearing, contact between the ball or roller, etc.
Globular or Spherical pair: In a spherical pair, one link is constrained to swivel in or about the other fixed point.
- Example: Ball in the socket
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Sliding pair: In this pair two links are so connected that one is constrained to have sliding motion relative to another e.g. crosshead and guide.
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Turning pair: In this pair two links are so connected that one is constrained to turn or revolve about a fixed axis of another e.g. crankshaft turning in a bearing