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Question

Consider the Grubler’s criteria for the planar mechanism as F = 3(n - 1) - 2l - h What does l represent in the above equation?

A.

Number of lower pairs

B.

Number of links 

C.

Length of the longest link

D.

Number of mobile links

Answer ( Option A)

Number of lower pairs

Solution

According to the expression given in question,  

F = 3(n - 1) - 2l - h 

Where, F =  Degree of freedom    

             n = Number of links

             l = Number of binary joints (lower pair)

             h =   Number of higher pair 

Hence, the correct option is (A).

&Key Points:-

Where, link 3 is coupler rod.

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