Question

What is redundant support?

(a) The supports consisting of hinge and a roller

(b) The supports consisting of hinge only

(c) The supports consisting of roller only

(d) The supports more than necessary to hold the structure

I have been asked this question by my school principal while I was bunking the class.

This key question is from Constraints and Statical Determinacy topic in chapter Equilibrium of a Rigid Body of Engineering Mechanics

Answer 1

Correct answer is (d) The supports more than necessary to hold the structure

To elaborate: The supports if are more than the supports required to hold the structure are termed as the reductant supports. It becomes statically indeterminate. This not only creates a problem in achieving the equilibrium but also affects the calculation of the equilibrium.