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The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.

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in Machine Kinematics by (38.0k points)
The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.

(a) True

(b) False

This question was posed to me during an online exam.

My question is from Number of Degrees of Freedom for Plane Mechanisms topic in chapter Simple Mechanisms of Machine Kinematics

1 Answer

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by (106k points)
The correct choice is (a) True

Easy explanation: The permanent instantaneous centres move when the mechanism moves, but the joints are of permanent nature.

Fixed instantaneous centres  remain in the same place for all configurations of the mechanism.

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