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UPSC Civil Service Exam Questions - Engineering

Q1:

For a laminated spring, l = length, n = number of plates, width of each plate = b, thickness of each plate = t, central point load = W, what is the expression for the maximum bending stores ?

A
* 2

B

C

D

ANS:D -

M/I = σ/Y = E/R.
(WL/4)/(nbt^2)/6 = 3WL/2nbt^2.