Correct Answer - Option 3 : m = 3 (n - 1) - 2j
1 - j
2
Explanation:
Degree of freedom(DOF)/Mobility of linkage –
- Degree of freedom of plane mechanism is defined as the number of inputs or independent coordinates needed to define the configuration or
- position of all the links of mechanism with respect to a fixed link.
Kutzback equation of degree of freedom,
F = 3 × (n – 1) – 2j1 – j2
Where, n = number of links in the mechanism, j1 = Binary joint or lower pair, j2 = higher Pair and F = Degree of freedom
Grubler's criterial applies to planar mechanism having no higher pairs (h = 0) and completely constraint (F = 1).
1 = 3 × (n – 1) – 2j
∴ 1 = 3n – 3 – 2j
∴ 2j – 3n + 4 = 0