# Structural Analysis 2 Solved MCQs

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1.

## 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
Answer» A. deflections are linear functions of applied forces
2.

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

A. in statically determinate structures only
B. for any type of structure
C. at the point under the load only
D. for beams and frames only
Answer» B. for any type of structure
3.

## 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

A. change from compression to tension
B. change from tension to compression
C. always be compression
D. always be tension
Answer» A. change from compression to tension
4.

## Which of the following methods of structural analysis is a force method?

A. slope deflection method
B. column analogy method
C. moment distribution method
D. none of the above
Answer» B. column analogy method
5.

## Which of the following is not the displacement method?

A. equilibrium method
B. column analogy method
C. moment distribution method
D. kani\s method
Answer» B. column analogy method
6.

## 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
Answer» C. remains unchanged
7.

## The deflection at any point of a perfect frame can be obtained by applying a unit load at the joint in

A. vertical direction
B. horizontal direction
C. inclined direction
D. the direction in which the deflection is required
Answer» D. the direction in which the deflection is required
8.

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

A. internal forces only
B. external forces only
C. internal as well as external forces
D. none of the above
Answer» C. internal as well as external forces
9.

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

A. unstable
B. stable and statically determinate
C. stable and statically indeterminate
D. none of the above
10.

## The three moments equation is applicable only when

A. the beam is prismatic
B. there is no settlement of supports
C. there is no discontinuity such as hinges within the span
D. the spans are equal
Answer» C. there is no discontinuity such as hinges within the span
11.

## Which of the following methods of structural analysis is a displacement method?

A. moment distribution method
B. column analogy method
C. three moment equation
D. none of the above
Answer» A. moment distribution method
12.

## 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
Answer» D. free end
13.

## 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
Answer» B. is decreased
14.

## A load 'W T maximum bending moment at 0.4 1 from the left support is

A. 0.16 wl
B. 0.20 wl
C. 0.24 wl
D. 0.25 wl
Answer» C. 0.24 wl
15.

## In the displacement method of structural analysis, the basic unknowns are

A. displacements
B. force
C. displacements and forces
D. none of the above
16.

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

A. zero
B. less than 1
C. 1
D. greater than 1
17.

A. 2/ei
B. 1/ei
C. 1/2 ei
D. 1/4 ei
18.

A. l/ei
B. l/2ei
C. l/3ei
D. l/4ei
19.

## 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
Answer» A. 2j - r
20.

A. 1
B. 2
C. 3
D. 6
21.

## While using three moments equation, a fixed end of a continuous beam is replaced by an additional span of

A. zero length
B. infinite length
C. zero moment of inertia
D. none of the above
Answer» A. zero length
22.

## Select the correct statement

A. flexibility matrix is a square symmetrical matrix
B. stiffness matrix is a square symmetrical matrix
C. both (a) and (b)
D. none of the above
Answer» C. both (a) and (b)
23.

## W L x x

A. 0.211 l
B. 0.25 l
C. 0.234 l
D. 0.5 l
Answer» A. 0.211 l
24.

## Bending moment at any section in a conjugate beam gives in the actual beam

A. slope
B. curvature
C. deflection
D. bending moment
25.

A. 1
B. 2
C. 3
D. 6
26.

## 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
Answer» B. two linear movements and one rotation
27.

## 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

A. m + r + 2j
B. m - r + 2j
C. m + r - 2j
D. m + r - 3j
Answer» C. m + r - 2j
28.

A. 0
B. 1/2
C. 3/4
D. 1
29.

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

A. increase and decrease
B. increase and increase
C. decrease and increase
D. decrease and decrease
Answer» D. decrease and decrease
30.

## The maximum bending moment due to a train of wheel loads on a simply supported girder

A. always occurs at centre of span
B. always occurs under a wheel load
C. never occurs under a wheel load
D. none of the above
Answer» B. always occurs under a wheel load
31.

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

A. the centre of gravity of the load system is midway between the centre of span and wheel load under consideration
B. the centre of span is midway between the centre of gravity of the load system and the wheel load under consideration
C. the wheel load under consideration is midway between the centre of span and the centre of gravity of the load system
D. none of the above
Answer» B. the centre of span is midway between the centre of gravity of the load system and the wheel load under consideration
32.

## 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
Answer» C. only when principle of superposition is valid
33.

A. 1
B. 2
C. 3
D. 6
34.

A. 2
B. 3
C. 4
D. 6
35.

A. 2
B. 3
C. 6
D. 8
36.

A. 2
B. 3
C. 4
D. unrestricted
37.

## A single rolling load of 8 kN rolls along a girder of 15 m span. The absolute maximum bending moment will be

A. 8 kn.m
B. 15 kn.m
C. 30 kn.m
D. 60 kn.m
Answer» C. 30 kn.m
38.

## The deformation of a spring produced by a unit load is called

A. stiffness
B. flexibility
C. influence coefficient
D. unit strain