The point of contraflexure is the point where B.M. changes sign B.M. is maximum

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Question
The point of contraflexure is the point where
Options
A. B.M. changes sign
B. B.M. is maximum
C. B.M. is minimum
D. S.F. is zero.

Correct Answer

B.M. changes sign

Theory of Structures problems

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1. A spring of mean radius 40 mm contains 8 action coils of steel (N = 80000 N/mm²), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is
Options
A. 25 N
B. 30 N
C. 35 N
D. 40 N

5. Keeping the depth d constant, the width of a cantilever of length l of uniform strength loaded with a uniformly distributed load w varies from zero at the free end and
Options
A. at the fixed end
B. at the fixed end
C. at the fixed end
D. at the fixed end

7. Pick up the correct statement from the following:
Options
A. The bent up bars at a support resist the negative bending moment
B. The bent up bars at a support resist the sharing force
C. The bending of bars near supports is generally at 45�
D. All the above.

9. The assumption on which the trapezoidal formula for volumes is based, is
Options
A. The end sections are parallel planes
B. The mid-area of a pyramid is half the average area of the ends
C. The volume of the prismoidal is over-es-timted and hence a prismoidal correction is applied
D. All the above.

10. Pick up the incorrect statement regarding a master trap from the following :
Options
A. It is provided in between the lower end of the house drain and the street sewer
B. It is provided a cleaning eye at the top of the trap
C. The height of fresh air inlet pipe fixed vertically with wall is 3 m
D. The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
E. The water seal is less than that of ordinary traps.

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