Interview Questions on Steel Structures - Set 10 - ObjectiveBooks

Practice Test: Question Set - 10

1. According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to
(A) 1.0% of the axial load
(B) 2.0% of the axial load
(C) 2.5% of the axial load
(D) 3.0% of the axial load

2. The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as
(A) 1.8 L
(B) L
(C) 1.1 L
(D) 1.5 L

3. The method of design of steel framework for greatest rigidity and economy in weight, is known as
(A) Simply design
(B) Semi-rigid design
(C) Fully rigid design
(D) None of these

4. For a cantilever beam of length ‘L’ built-in at the support and restrained against torsion at the free end, the effective projecting length ‘l’ is
(A) l = 0.7 L
(B) l = 0.75 L
(C) l = 0.85 L
(D) l = 0.5 L

5. Economical depth of a plate girder corresponds to
(A) Minimum weight
(B) Minimum depth
(C) Maximum weight
(D) Minimum thickness of web

6. Slenderness ratio of a compression member is
(A) Moment of inertia/Radius of gyration
(B) Effective length/Area of cross-section
(C) Radius of gyration/Effective length
(D) Radius of gyration/ Area of cross-section

7. The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
(A) 150 t
(B) 160 t
(C) 170 t
(D) 180 t

8. Bearing stiffeners are provided at
(i) The supports
(ii) The mid span
(iii) The point of application of concentrated loads
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) (i), (ii) and (iii)

9. Web crippling generally occurs at the point where
(A) Bending moment is maximum
(B) Shearing force is minimum
(C) Concentrated loads act
(D) Deflection is maximum

10. Pick up the correct statement from the following:
(A) The slenderness ratio of lacing bars for compression members should not exceed 145
(B) The minimum width of lacing bar connected with rivets of nominal diameter 16 mm, is kept 50 mm
(C) The minimum thickness of a flat lacing bar is kept equal to one-fortieth of its length between inner end rivets
(D) All the above

11. The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is
(A) 10 m
(B) 20 m
(C) 25 m
(D) 50 m

12. If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than
(A) d
(B) 1.25 d
(C) 1.5 d
(D) 1.75 d

13. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than
(A) d but not less than 0.20 d
(B) 1.25 d but not less than 0.33 d
(C) 1.5 d but not less than 0.33 d
(D) 2.0 d but not less than 0.50 d

14. The allowable tensile stress in structural mild steel plates for steel tank is assumed as
(A) 95.0 MPa on net area
(B) 105.5 MPa on net area
(C) 105.5 MPa on gross area
(D) 150.0 MPa on gross area

15. A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than
(A) d/250 for structural steel
(B) d/225 for high tensile steel
(C) Both (a) and (b)
(D) Neither (a) nor (b)

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