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Doctors Medicines MCQs Q&A

  1. 1 and 2
  2. 2 and 3
  3. 1, 2 and 3
  4. 1 and 3
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1 Answers

Option 3 : 1, 2 and 3

Concept:

Kinematic pairs are classified under three headings namely, lower pair, higher pair, and wrapping pair.

Lower Pair:

A pair is said to be a lower pair when the connection between two elements is through the area of contact. Some of the types of Lower pair are:

  • Revolute Pair
  • Prismatic Pair
  • Screw Pair
  • Cylindrical Pair
  • Spherical Pair
  • Planar Pair

Higher Pair:

A pair is said to be higher pair when the connection between two elements has only a point or line of contact.

Examples of higher pairs are:

  • A point contact takes place when spheres rest on a plane or curved surfaces (in the case of ball bearings)
  • Contact between teeth of a skew-helical gears
  • Contact made by roller bearings
  • Contact between teeth of most of the gears
  • Contact between cam-follower
  • Contact between belt and pulley.


Wrapping Pairs:

In a higher pair, the contact between the two bodies has only a line contact or a point contact. Whereas in a wrapping pair, one body completely wraps over the other.

The typical example is of a belt and a pulley or a chain and a sprocket where the belt completely wraps around the pulley or the chain completely wraps around the sprocket. 

Wrapping pair is closer to higher pair since it is multiple point contact

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