GATE ME 2020 Set 2 — Question 18
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Theory of Machines & Vibrations → Mechanisms & Linkages → Four-Bar & Slider-Crank
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Question
The number of qualitatively distinct kinematic inversions possible for a Grashof chain with four revolute pairs is
Correct answer
(C) 3
Solution
A Grashof four-bar chain satisfies the condition . By fixing different links, we get the following distinct inversions:
1.Double Crank Mechanism: Obtained by fixing the shortest link ().
2.Crank-Rocker Mechanism: Obtained by fixing either of the two links adjacent to the shortest link ( or ). Both result in the same kinematic behavior type.
3.Double Rocker Mechanism: Obtained by fixing the link opposite to the shortest link ().
Therefore, there are 3 qualitatively distinct inversions.Continue learning with Success Tracker
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