Question

In a four bar chain mechanism, there are 4 links and 4 turning pairs. If one of the link is fixed, the degree of freedom of mechanism is 
1. 1
2. 2
3. 3
4. 6

Answer 1

Correct Answer - Option 1 : 1

Concept:

Gruebler's criteria for planar mechanism:

DOF = 3(n - 1) - 2P

where n = no of links, P = No of lower pairs(turning pairs)

Calculation:

Given:

n = 4, P =4

DOF = 3(4 - 1) - 2 × 4 = 1