Question

In a girder of rectangular cross-section, the longer side is used as

(A) length

(B) breadth

(C) depth

(D) all of above​

Answer 1

Explanation:

It will be length....so option a is the correct answer

Answer 2

In a girder of rectangular cross-section, the longer side is used as Depth (Option C)

Explanation:

When a weight of 'W' is attached to the girder of length l, breadth b, and depth d with the horizontal support, the depression that is produced at the midpoint of the girder will be:

δ = $\frac{Wl^{3} }{4Ybd^{3} }$

From this, we can determine that depression is inversely proportional to depth.

δ $\alpha \frac{1}{bd^{3} }$

Over b, the power of d makes the value larger. To keep the depression low, the value of depth 'd' needs to be high.  So, depth is used as a longer side in a girder of rectangular cross-section.

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