1000+ Design of Steel Structures Multiple Choice Question Answer [Solved]

1. For a rectangular section, the ratio of the maximum and average shear stresses, is
A. 1.5
B. 2.0
C. 2.5
D. 3.5
Answer : A

2. The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is
A. WL³/3EI
B. WL⁴/3EI
C. WL³/48EI
D. 5WL⁴/384EI
Answer : C

3. The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).
A. 2 d
B. 4 d
C. 6 d
D. 8 d
Answer : D

4. 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
Answer : B

5. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is
A. 180
B. 200
C. 250
D. 350
Answer : D

6. The maximum slenderness ratio of a steel column, the design of which is governed by wind or seismic forces is
A. 150
B. 180
C. 250
D. 350
Answer : C

7. Which of the following sections should preferably be used at places where torsion occurs?
A. Angle section
B. Channel section
C. Box type section
D. Any of the above
Answer : C

8. A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is
A. < 19
B. < 24
C. > 19
D. > 24
Answer : B

9. Lug angles
A. Are used to reduce the length of connection
B. Are unequal angles
C. Increases shear lag
D. All the above
Answer : A

10. The economical depth d of a web plate in which allowable bearing stress is f_b, and the maximum bending moment is M, as suggested by Rawater and Clark, is
A. d = ?(M/f_b)
B. d = 1.5 ?(M/f_b)
C. d = 2.5 ?(M/f_b)
D. d = 4.5 ?(M/f_b)
Answer : D

11. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as
A. 120 mm
B. 160 mm
C. 200 mm
D. 300 mm
Answer : B

12. The external wind pressure acting on a roof depends on
A. Degree of permeability of roof
B. Slope of roof
C. Both (A) and (B)
D. None of the above
Answer : B

13. Generally the purlins are placed at the panel points so as to avoid
A. Axial force in rafter
B. Shear force in rafter
C. Deflection of rafter
D. Bending moment in rafter
Answer : D

14. If d is the distance between the flange angles, the vertical stiffeners in plate girders without horizontal stiffeners, are spaced at a distance not less than
A. 0.15 d
B. 0.22 d
C. 0.33 d
D. 0.44 d
Answer : C

15. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus
A. 1.0 mm
B. 1.2 mm
C. 1.4 mm
D. 1.6 mm
Answer : D

16. The rivets which are heated and then driven in the field, are known
A. Power driven shop rivets
B. Power driven field rivets
C. Hand driven rivets
D. Cold driven rivets
Answer : B

17. The permissible stress to which a structural member can be subjected to, is known as
A. Bearing stress
B. Working stress
C. Tensile stress
D. Compressive stress
Answer : B

18. For a single section used as a tension member, the given area is assumed
A. 20% to 30% in excess of the net area
B. 30% to 40% in excess of the net area
C. 40% to 50% in excess of the net area
D. 50% to 60% in excess of the net area
Answer : C

19. 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
Answer : C

20. In rolled steel beams, shear force is mostly resisted by
A. Web only
B. Flanges only
C. Web and flanges together
D. None of these
Answer : A

21. Design of a riveted joint, is based on the assumption:
A. Load is uniformly distributed among all the rivets
B. Shear stress on a rivet is uniformly distributed over its gross area
C. Bearing stress in the rivet is neglected
D. All the above
Answer : D

22. The gross diameter of a rivet is the diameter of
A. Cold rivet before driving
B. Rivet after driving
C. Rivet hole
D. None of these
Answer : B

23. When two plates are placed end to end and are joined by two cover plates, the joint is known as
A. Lap joint
B. Butt joint
C. Chain riveted lap joint
D. Double cover butt joint
Answer : D

24. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be
A. 16 mm
B. 20 mm
C. 24 mm
D. 27 mm
Answer : C

25. In a built up section carrying a tensile force, the flanges of two channels are turned outward
A. To simplify the transverse connections
B. To minimise lacing
C. To have greater lateral rigidity
D. All the above
Answer : C

26. Column footing is provided
A. To spread the column load over a larger area
B. To ensure that intensity of bearing pressure between the column footing and soil does not exceed permissible bearing capacity of the soil
C. To distribute the column load over soil through the column footing
D. All the above
Answer : D

27. The permissible bearing stress in steel, is
A. 1500 kg/cm2
B. 1890 kg/cm2
C. 2025 kg/cm2
D. 2340 kg/cm2
Answer : B

28. Pick up the correct statement from the following:
A. The steel beams placed in plain cement concrete, are known as reinforced beams
B. The filler joists are generally continuous over three-supports only
C. Continuous fillers are connected to main beams by means of cleat angles
D. Continuous fillers are supported by main steel beams
Answer : D

29. The effective length of a compression member of length L held in position and restrained in direction at one end and effectively restrained in direction but not held in position at the other end, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : A

30. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
A. 5 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B

31. 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
Answer : C

32. If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is
A. t = ?[(b × p)/6M]
B. t = ?[6M/(b × p)]
C. t = 6M/bp
D. t = ?6M/(b × p)
Answer : B

33. Lacing bars in a steel column should be designed to resist
A. Bending moment due to 2.5% of the column load
B. Shear force due to 2.5% of the column load
C. 2.5% of the column load
D. Both (A) and (B)
Answer : B

34. Area of openings for buildings of large permeability is more than
A. 10% of wall area
B. 20% of wall area
C. 30% of wall area
D. 50% of wall area
Answer : B

35. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm
Answer : B

36. Rolled steel beams are designated by Indian Standard series and its
A. Weight per metre and depth of its section
B. Depth of section and weight per metre
C. Width of flange and weight per metre
D. Weight per metre and flange width
Answer : B

37. If the depth of the section of an upper column is smaller than the lower column
A. Filler plates are provided with column splice
B. Bearing plates are provided with column splice
C. Filler plates and bearing plates are provided with column splice
D. None of these
Answer : D

38. 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
Answer : C

39. As compared to field rivets, the shop rivets are
A. Stronger
B. Weaker
C. Equally strong
D. Any of the above
Answer : A

40. The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : C

41. In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon:
A. Pitch
B. Gauge
C. Diameter of the rivet holes
D. All the above
Answer : D

42. A circular column section is generally not used in actual practice because
A. It is uneconomical
B. It cannot carry the load safely
C. It is difficult to connect beams to the round sections
D. All of the above
Answer : C

43. Effective sectional area of a compression member is:
A. Gross sectional area - area of rivet hole
B. Gross sectional area + area of rivet hole
C. Gross sectional area × area of rivet hole
D. Gross sectional area + area of rivet hole
Answer : A

44. Minimum spacing of vertical stiffeners is limited to
A. d/4
B. d/3
C. d/2
D. 2d/3 Where d is the distance between flange angles
Answer : B

45. The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed
A. 60
B. 45
C. 35
D. 25
Answer : C

46. Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of
A. Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment
B. Area of tension flange at the minimum bending moment of the corresponding area at the point of maximum bending moment
C. Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment
D. None of these
Answer : C

47. The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at
A. The neutral axis of the section
B. 2/3rd of the depth of the neutral axis from the compression flange
C. 2/5th of the depth of the neutral axis from the compression flange
D. 2/5th of the height of the neutral axis from tension flange
Answer : C

48. Rivets connecting flange angles to cover plates in a plate girder are subjected to
A. Horizontal shear only
B. Vertical load only
C. Both (A) and (B)
D. None of the above
Answer : A

49. The slenderness ratio of a column is zero when its length
A. Is zero
B. Is equal to its radius of gyration
C. Is supported on all sides throughout its length
D. Is between the points of zero moments
Answer : D

50. A fillet weld may be termed as
A. Mitre weld
B. Concave weld
C. Convex weld
D. All the above
Answer : D