For determining the support reactions at A and B of a three hinged arch, points

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For determining the support reactions at A and B of a three hinged arch, points B and C are joined and produced to intersect the load line at D and a line parallel to the load line through A at D'. Distances AD, DD' and AD' when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is
Options
A. 30�
B. 45�
C. 60�
D. 90�

Correct Answer

90�

Theory of Structures problems

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2. Total strain energy theory for the failure of a material at elastic limit, is known
Options
A. Guest's or Trecas' theory
B. St. Venant's theory
C. Rankine's theory
D. Haig's theory
E. Von Mises's theory.

3. A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,
Options
A. 10 m
B. 12 m
C. 14 m
D. 16 m
E. 18 m

4. Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as
Options
A. Compound beams
B. Indeterminate beams
C. Determinate beams
D. Composite beams.

6. A material which obeys Hook's law, is subjected to direct stress ?₀. At its elastic limit, the following statement is true,
Options
A. Strain is equal to
B. Maximum shear stress =
C. Strain energy =
D. Shear strain energy =
E. All the above.

7. Pick up the incorrect statement from the following : The torsional resistance of a shaft is directly proportional to
Options
A. modulus of rigidity
B. angle of twist
C. reciprocal of the length of the shaft
D. moment of inertia of the shaft section.

10. A material may fail if
Options
A. maximum principal stress exceeds the direct stress ?₀
B. maximum strain exceeds
C. maximum shear stress exceeds
D. total strain energy exceeds
E. all the above.

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