# Mechanical Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 8 (Q.No. 32)
32.
A simply supported beam 'A' of length l, breadth b, and depth d carries a central point load W. Another beam 'B' has the same length and depth but its breadth is doubled. The deflection of beam 'B' will be __________ as compared to beam 'A'.
one-fourth
one-half
double
four times
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 1 of 2.

Rashid Khan Kakar said:   3 years ago
Breadth is inversely proportional to deflection.
(1)

Niranjan said:   5 years ago
I think C is the correct answer.
(1)

Rupesh said:   5 years ago
Thank you @Som.

Basavaraj said:   6 years ago
Option B is correct. Because deflection is inversely proportional to flexural rigidity EI And I=bd^3/12.

A=wl^3/48E*bd^3/12.
A=wl^3/4E*bd3,
B=wl^3/48E*2bd^3/12,
B=wl^3/8E*bd^3,
B/A=1/2.

Ans:B correct

Swapnil said:   6 years ago
Option b is correct. Because deflection is inversely proportional to flexural rigidity EI And I=bd^3/12.

Debashis Das said:   6 years ago
According to me, Option: C is correct.

Debashis Das said:   6 years ago
Yes, Option C is correct.

Som said:   6 years ago
Deflection - pl/AE.

So, deflection is inversely proportional to area Db/Da=Aa/Ab=1/2.

S.k said:   6 years ago