Q. 25 The lower pairs are _________ pairs.

  • ASelf-closed$$x^2 = \frac{n^2+n}{2}$$
  • BForce-closed
  • CFriction closed
  • DNone of these
Correct Answer : (A)

Self-closed

$$x^2 = \frac{n^2+n}{2}$$

Hints :

The lower pairs are Self-closed pairs.

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In a coupling rod of a locomotive, each of the four pairs is a ________ pair.

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