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UPSC Civil Service Exam Questions

Q1:
A timber beam of rectangular section 100 mm x 50 mm is simply supported at the ends, has a 30 mm x 10 mm steel strip securely fixed to the top surface as shown in the given figure.
The centroid of the "Equivalent timber beam" in this case from the tope surface

A is 5 mm

B is 30 mm

C is 15 mm

D cannot be predicted

ANS:B - is 30 mm

B is right.

For equivalent timber beam , top of steel beam = 20 * 30=600 mm.
From top Y = (A1Y1+A2Y2)/(A1+A2).



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