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
A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
Related Mcqs:
- To generate the j the column of the flexibility matrix________________?
A. a unit force is applied at coordinate j and the displacements are calculated at all coordinates
B. a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates
C. a unit force is applied at coordinate j and the forces are calculated at all coordinates
D. a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates - A rigid-jointed plane frame is stable and statically determinate if_______________?
A. (m + r) = 2j
B. (m + r) = 3j
C. (3m + r) = 3j
D. (m + 3r) = 3j
where m is number of members, r is reaction components and j is number of joints - Degree of kinematic indeterminacy of a pin-jointed plane frame is given by______________?
A. 2j – r
B. j – 2r
C. 3j – r
D. 2j + r - Castigliano’s first theorem is applicable_______________?
A. for statically determinate structures only
B. when the system behaves elastically
C. only when principle of superposition is valid
D. none of the above - For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust______________?
A. is increased
B. is decreased
C. remains unchanged
D. becomes zero - The fixed support in a real beam becomes in the conjugate beam a___________________?
A. roller support
B. hinged support
C. fixed support
D. free end - The deformation of a spring produced by a unit load is called _________________?
A. stiffness
B. flexibility
C. influence coefficient
D. unit strain - For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust__________________?
A. is increased
B. is decreased
C. remains unchanged
D. becomes zero - Principle of superposition is applicable when___________________?
A. deflections are linear functions of applied forces
B. material obeys Hooke’s law
C. the action of applied forces will be affected by small deformations of the structure
D. none of the above - Independent displacement components at each joint of a rigid-jointed plane frame are_________________?
A. three linear movements
B. two linear movements and one rotation
C. one linear movement and two rotations
D. three rotations
