
Civilwar Day 5(Sep 19)-PWD
Authored by WINCENTRE CLASSES
Professional Development
1st - 5th Grade
Used 3+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A ratio of moment carrying capacity of a circular beam of diameter D and square beam of size D is:
Answer explanation
Circular beam (diameter D):
I = (π D^4) / 64
ymax = D/2
Zc = (π D^4 / 64) / (D/2) = (π D^3) / 32Square beam (side D):
I = D^4 / 12
ymax = D/2
Zs = (D^4 / 12) / (D/2) = D^3 / 6Ratio:
Zc / Zs = (π D^3 / 32) / (D^3 / 6) = 3π / 16
Final Answer: 3π / 16
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Pure bending is that bending where
Answer explanation
Pure bending occurs with constant moment and no shear force, hence shear stress is nil.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is the most efficient in carrying the bending moment?
Answer explanation
I-section is most efficient since material is placed farthest from the neutral axis.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Beam of uniform strength means
Answer explanation
Beam of uniform strength has constant bending stress, equal to allowable stress.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a simply supported beam loaded with U.D.L over the whole section, the bending stress is …………. at top and ………….. at bottom.
Answer explanation
Top fibers are in compression and bottom fibers are in tension under UDL.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Section modulus of hollow rectangular section is
Answer explanation
Z = I/ymax, with I = (BD³−bd³)/12 and ymax = D/2 gives Z = (BD³−bd³)/6D.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In an I -section , the bending moment is resisted mainly by
Answer explanation
Flanges resist bending moment; web carries shear force.
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