Structural Analysis

41. The number of independent equations to be satisfied for static equilibrium of a plane structure is

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

Correct answer: (C)
3

42. The principle of virtual work can be applied to elastic system by considering the virtual work of

  1. Internal forces only
  2. External forces only
  3. Internal as well as external forces
  4. None of the above

Correct answer: (C)
Internal as well as external forces

43. The three moments equation is applicable only when

  1. The beam is prismatic
  2. There is no settlement of supports
  3. There is no discontinuity such as hinges within the span
  4. The spans are equal

Correct answer: (C)
There is no discontinuity such as hinges within the span

44. The width of the analogous column in the method of column analogy is

  1. 2/EI
  2. 1/EI
  3. 1/2 EI
  4. 1/4 EI

Correct answer: (B)
1/EI

45. To generate the jth column of the flexibility matrix

  1. A unit force is applied at coordinate j and the displacements are calculated at all coordinates
  2. A unit displacement is applied at coordinate j and the forces are calculated at all coordinates
  3. A unit force is applied at coordinate j and the forces are calculated at all coordinates
  4. A Unit displacements is applied at coordinate 'j' and the displacements are calculated at all coordinates

Correct answer: (A)
A unit force is applied at coordinate j and the displacements are calculated at all coordinates

46. When a load crosses a through type Pratt truss in the direction left to right, the nature of force in any diagonal member in the left half of the span would

  1. Change from compression to tension
  2. Change from tension to compression
  3. Always be compression
  4. Always be tension

Correct answer: (A)
Change from compression to tension

47. When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

  1. The centre of gravity of the load system is midway between the centre of span and wheel load under consideration
  2. The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration
  3. The wheel load under consideration is midway between the centre of span and the centre of gravity of the load system
  4. None of the above

Correct answer: (B)
The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration

48. When a uniformly distributed load, longer than the span of the girder, moves from left to right, then the maximum bending moment at mid section of span occurs when the uniformly distributed load occupies

  1. Less than the left half span
  2. Whole of left half span
  3. More than the left half span
  4. Whole span

Correct answer: (D)
Whole span

49. When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

  1. The head of the load reaches the section
  2. The tail of the load reaches the section
  3. The load position should be such that the section divides it equally on both sides
  4. The load position should be such that the section divides the load in the same ratio as it divides the span

Correct answer: (D)
The load position should be such that the section divides the load in the same ratio as it divides the span

50. Which of the following is not the displacement method?

  1. Equilibrium method
  2. Column analogy method
  3. Moment distribution method
  4. Kani's method

Correct answer: (B)
Column analogy method

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