Structural Analysis

21. In the displacement method of structural analysis, the basic unknowns are

  1. Displacements
  2. Force
  3. Displacements and forces
  4. None of the above

Correct answer: (A)
Displacements

22. In the slope deflection equations, the deformations are considered to be caused by
(i) Bending moment
(ii) Shear force
(iii) Axial force
The correct answer is

  1. Only (i)
  2. (i) and (ii)
  3. (ii) and (iii)
  4. (i), (ii) and (iii)

Correct answer: (A)
Only (i)

23. Independent displacement components at each joint of a rigid-jointed plane frame are

  1. Three linear movements
  2. Two linear movements and one rotation
  3. One linear movement and two rotations
  4. Three rotations

Correct answer: (B)
Two linear movements and one rotation

24. Muller Breslau's principle for obtaining influence lines is applicable to
(i) Trusses
(ii) Statically determinate beams and frames
(iii) Statically indeterminate structures, the material of which is elastic and follows Hooke's law
(iv) Any statically indeterminate structure
The correct answer is

  1. (i), (ii) and (iii)
  2. (i), (ii) and (iv)
  3. (i) and (ii)
  4. Only (i)

Correct answer: (A)
(i), (ii) and (iii)

25. Number of unknown internal forces in each member of a rigid jointed plane frame is

  1. 1
  2. 2
  3. 3
  4. 6

Correct answer: (C)
3

26. Principle of superposition is applicable when

  1. Deflections are linear functions of applied forces
  2. Material obeys Hooke's law
  3. The action of applied forces will be affected by small deformations of the structure
  4. None of the above

Correct answer: (A)
Deflections are linear functions of applied forces

27. Select the correct statement

  1. Flexibility matrix is a square symmetrical matrix
  2. Stiffness matrix is a square symmetrical matrix
  3. Both (A) and (B)
  4. None of the above

Correct answer: (C)
Both (A) and (B)

28. Study the following statements.
(i) The displacement method is more useful when degree of kinematic indeterminacy is greater than the degree of static indeterminacy.
(ii) The displacement method is more useful when degree of kinematic indeterminacy is less than the degree of static indeterminacy.
(iii) The force method is more useful when degree of static indeterminacy is greater than the degree of kinematic indeterminacy.
(iv) The force method is more useful when degree of static indeterminacy is less than the degreeof kinematic indeterminacy.
The correct answer is

  1. (i) and (iii)
  2. (ii) and (iii)
  3. (i) and (iv)
  4. (ii) and (iv)

Correct answer: (D)
(ii) and (iv)

29. The carryover factor in a prismatic member whose far end is fixed is

  1. 0
  2. 43497
  3. 43558
  4. 1

Correct answer: (B)
43497

30. The Castigliano's second theorem can be used to compute deflections

  1. In statically determinate structures only
  2. For any type of structure
  3. At the point under the load only
  4. For beams and frames only

Correct answer: (B)
For any type of structure

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