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Question
In the case of  a square beam subjected to couples acting about X –X axis, it is advisable to cut off the edges and keep the section as shown in the given figure because it increases.
oxkZdkj /ju ds izdkj esa X- X v{k ds lkis{k ;qxy dk;Z dj jgk gS] lykguqlkj dkV ds fdukjks vkSj [kaM dks fp=kkuqlkj dkVk x;k gS D;ksafd blls c<+ksrjh gksrh gSA
A.
Stresses in the beam
B.
Stresses and reduces the weight of the beam
C.
The moment of inertia of the beam
D.
The section modulus
Answer ( Option D)

The section modulus

Solution

As we know,
                 
The increases of section modulus occurs due to the decrease in extreme fibre distance in greater proportion than it reduces the moment of inertia of the section.
So, the beam becomes more stronger.

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