Structural Analysis

11. Effects of shear force and axial force on plastic moment capacity of a structure are respectively to

  1. Increase and decrease
  2. Increase and increase
  3. Decrease and increase
  4. Decrease and decrease

Correct answer: (D)
Decrease and decrease

12. For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust

  1. Is increased
  2. Is decreased
  3. Remains unchanged
  4. Becomes zero

Correct answer: (B)
Is decreased

13. For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust

  1. Is increased
  2. Is decreased
  3. Remains unchanged
  4. Becomes zero

Correct answer: (C)
Remains unchanged

14. For single point load 'W' moving on a symmetrical three hinged parabolic arch of span 'L', the maximum sagging movement accours at a distance 'x' from ends. The value of 'x' is

  1. 0.211 L
  2. 0.25 L
  3. 0.234 L
  4. 0.5 L

Correct answer: (A)
0.211 L

15. For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal
(i) Of a stiffness matrix must be positive
(ii) Of a stiffness matrix must be negative
(iii) Of a flexibility matrix must be positive
(iv) Of a flexibility matrix must be negative
The correct answer is

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

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

16. If in a pin-jointed plane frame (m + r) > 2j, then the frame is

  1. Stable and statically determinate
  2. Stable and statically indeterminate
  3. Unstable
  4. None of the above
    Where 'M' number of membere, 'r' is reaction components and 'j' number of joints

Correct answer: (B)
Stable and statically indeterminate

17. If in a rigid-jointed space frame, (6m + r) < 6j, then the frame is

  1. Unstable
  2. Stable and statically determinate
  3. Stable and statically indeterminate
  4. None of the above

Correct answer: (A)
Unstable

18. If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by

  1. m + r + 2j
  2. m - r + 2j
  3. m + r - 2j
  4. m + r - 3j

Correct answer: (C)
m + r - 2j

19. In column analogy method, the area of an analogus column for fixed beam of span 'L' and flexural rigidity 'El' is taken as

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

Correct answer: (A)
L/EI

20. In moment distribution method, the sum of distribution factors of all the members meeting at any joint is always

  1. Zero
  2. Less than 1
  3. 1
  4. Greater than 1

Correct answer: (C)
1

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