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According to Grashof’s criteria: (where l – length of longest link, s – length of shortest link, p and q are length of other two links)

According to Grashof’s criteria: (where l – length of longest link, s – length of shortest link, p and q are length of other two links) Correct Answer l + s < p + q

Explanation:

According to Grashof’s Law:

"A four-bar mechanism has at least one revolving link if the sum of the lengths of the largest and shortest links is less than the sum of lengths of the other two links".

Additional Information

(1) S + L ≤ P + Q (Class I mechanism)

There will be at least one complete revolution between the two links.

  • If the shortest link is fixed: Double Crank Mechanism
  • If any of the adjacent links of the shortest link if fixed: Crank rocker mechanism
  • If the link opposite to shortest link is fixed: Double Rocker Mechanism

(2) S + L > P + Q (Class II mechanism)

  • Only a double rocker mechanism is possible.

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