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UPSC Civil Service Exam Questions - Engineering

Q1:

In a diamond riveting, for a plate of width land rivet diameter 'd' the efficiency of the joint is given by

A (b - d)/b

B (b / 2d)/b

C (b - d)/d

D (b - 2d)/d

ANS:A - (b - d)/b

Efficiency = strengths of joint /strength of the plate.

Here tensile strength of the joint is considered,
Tensile strength of joint = fyAn =fy.(b-d)t,
Tensile strength of plate = fy.Ag= fy.bt.

fy(b-d)t/fy.bt =( b-d)/b.