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Which of the following is a lower pair?
1. Piston and cylinder
2. Cam and follower
3. Belt drive
4. Gear

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Correct Answer - Option 1 : Piston and cylinder

Explanation:

Lower pair:

  • A pair is said to be a lower pair when the connection between two elements is through the area of contact.
    • Revolute Pair
    • Prismatic Pair (Piston and cylinder)
    • Screw Pair
    • Cylindrical Pair
    • Spherical Pair (Ball and socket)
    • Planar Pair, etc.

Higher pair:

  • higher pair is defined as one in which the connection between two elements has only a point or line of contact.
  • A point contact takes place when spheres rest on a plane or curved surfaces (ball bearings) or between teeth of skew-helical gears, in roller bearings, between teeth of most of the gears, and in cam-follower motion.

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