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UPSC Civil Service Exam Questions - Engineering

Q1:

A symmetrical channel section is made of a material which is equally strong in tension and compression. It is used as a simply supported beam with its web horizontal to carry vertical loads. It will

A be strongest if the web is used as top face

B be strongest if the web is used as bottom face

C be equally strong in (a) and (b) above

D not be possible to state which of the above statements is correct

ANS:A - be strongest if the web is used as top face

Option A is correct. Because it is getting more area to resist bending than 2nd condition for the same loading.

In 1st condition, it is getting top full horizontal to resist bending, but in the 2nd case, it is getting bottom web except for 2 vertical flanges. 2nd condition is less area and so less resist bending.