### 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

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

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

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

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

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

(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

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

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

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