# Civil engineer objective questions – Structural Analysis and Design (Section-15)

1) Number of unknown internal forces in each member of a rigid jointed plane frame is_____?

a) 1

b) 2

c) 3

d) 4

2) 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

3) If the pin-jointed plane frame (m+r)>2j, then the frame is____?

a) Stable and statically determinate

b) Stable and statically indeterminate

c) Unstable

d) None of the above

Where m is number of member, r is reaction components and j is number of joints

4) 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

5) The degree of static indeterminacy of a pin-jointed space frame is given by____?

a) M+r-2j

b) M+r-3j

c) 3m+r-3j

d) M+r+3j

Where is number of unknown member forces, r is unknown reaction components and j is number of joints

6) The degree of kinematic indeterminacy of a pin-jointed space frame is____?

a) 2j-r

b) 3j-r

c) J-2r

d) J-3r

Where is the number of joints and r is reaction components.

7) 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

8) In movement 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

9)  In column analogy method, the area of an`analogous column for a fixed beam of span L and flexural rigidity EI is taken as___?

a) L/EI

b) L/2EI

c) L/3EI

d) L/4EI

10)  The deflection 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

11) 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

12) The castigliano’s second theorem can be used to computer deflections___?

a) In statically determinate structural only

b) For any type of structure

c) At the point under the load only

d) For beams and frames only

13) For 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

14) A single rolling load 8kN rolls along a girder of 15m span. The absolute maximum bending moment will be___?

a) 8kN.m

b) 15kN.m

c) 30kN.m

d) 60kN.m

15)  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____?

a) Less than the left half span

b) Whole of left half span

c) More than the half span

d) Whole span

16) When a series of wheel load 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 consi-deration

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 spam and the centre of gravity of the load system

d) None of the above

17) Which of the following is not the displacement method?

a) Equilibrium method

b) Column analogy method

c) Moment distribution method

d) Kani’s method

18) 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

19) 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

20) 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