Question

The Kutzback criterion for determining the number of degrees of freedom (n) of a mechanism with L as number of links, J as number of lower pairs and H as number of higher pairs is
1. 3 (J-1) – 2L – H 
2. 2 (L-1) – 2J – H
3. 3 (L-1) – 2J – H 
4. 2 (L-1) – 3J – H

Answer 1

Correct Answer - Option 3 : 3 (L-1) – 2J – H 

Concept:

The degree of freedom is equal to the number of independent coordinates require to specify its configuration, i.e., the relative positions of all the links.

According to Kulzbeck law,

F = 3 (L - 1) - 2 j - h

where, L = no. of links, j = no. of joints, h = no. of higher pairs