Test Academy | A planar four-bar linkage mechanism with 3 revolute kinematic pairs and 1 prismatic kinematic pair is shown in the figure, where AB ⊥ CE and FD ⊥ CE. The T-shaped link CDEF is constructed such that the slider B can cross the point D, and CE is sufficiently long. For the given lengths as shown, the mechanism is a Grashof chain with links AG, AB, and CDEF completely rotatable about the ground link FG, a non-Grashof chain with all oscillating links, a Grashof chain with AB completely rotatable about the ground link FG, and oscillatory links AG and CDEF, on the border of Grashof and non-Grashof chains with uncertain configuration(s)

Question

A planar four-bar linkage mechanism with 3 revolute kinematic pairs and 1 prismatic kinematic pair is shown in the figure, where AB ⊥ CE and FD ⊥ CE. The T-shaped link CDEF is constructed such that the slider B can cross the point D, and CE is sufficiently long. For the given lengths as shown, the mechanism is

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a Grashof chain with links AG, AB, and CDEF completely rotatable about the ground link FG
a non-Grashof chain with all oscillating links
a Grashof chain with AB completely rotatable about the ground link FG, and oscillatory links AG and CDEF
on the border of Grashof and non-Grashof chains with uncertain configuration(s)

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