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

1. Number of rivets required in a joint, is
A. Load/Shear strength of a rivet
B. Load/Bearing strength of a rivet
C. Load/Tearing strength of a rivet
D. Load/Rivet value
Answer : D

2. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (Where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
A. Is at the maximum distance from CG of the rivet group
B. Is at the minimum distance from CG of the rivet group
C. Gives the maximum angle between the two forces Fa and Fm
D. Gives the minimum angle between the two forces Fa and Fm
Answer : D

3. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
A. 40 %
B. 50 %
C. 60 %
D. 70 %
Answer : C

4. In the cross-section of a weld, throat is the
A. Minimum dimension
B. Average dimension
C. Maximum dimension
D. None of the above
Answer : A

5. Pick up the correct statement from the following:
A. The ends of a strut, are connected together with two rivets
B. The members of strut will have at least two connections spaced equidistant in their length
C. The members when separated back-to-back, the connecting rivets should pass through solid washer or packing
D. All the above
Answer : D

6. When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from
A. Each web
B. Each flange
C. Each web or one hole from each flange whichever is more
D. Each web or one hole from each flange whichever is less
Answer : D

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

8. According to IS : 800-1962 the permissible bending stress in steel slab plates, is
A. 1500 kg/cm²
B. 1420 kg/cm²
C. 2125 kg/cm²
D. 1890 kg/cm²
Answer : D

9. 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

10. Minimum pitch of the rivets shall not be less than
A. 1.5 d
B. 2.0 d
C. 2.5 d
D. 3.0 d Where d is gross diameter of rivet
Answer : C

11. The strength of a riveted lap joint is equal to its
A. Shearing strength
B. Bearing strength
C. Tearing strength
D. Least of (a), (b) and (c)
Answer : D

12. When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
A. 2
B. 4
C. 6
D. 8
Answer : D

13. The channels get twisted symmetrically with regard to its axis
A. Parallel to flanges
B. Parallel to web
C. Perpendicular to flanges
D. Perpendicular to web
Answer : B

14. The equivalent axial tensile load Pe, which produces an average axial tensile stress in the section equivalent to the combined stress due to axial tension P and bending M, at the extreme fibre of the section, is given by (where Z is the section modulus of the section).
A. Pe = P + MA/Z
B. Pe = P - MA/Z
C. Pe = P - Z/MA
D. Pe = P + Z/MA
Answer : A

15. Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or
A. 16 times the thickness of outside plate
B. 24 times the thickness of outside plate
C. 32 times the thickness of outside plate
D. 36 times the thickness of outside plate
Answer : C

16. An imaginary line along which rivets are placed, is known as
A. Rivet line
B. Back line
C. Gauge line
D. All the above
Answer : D

17. 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

18. The moment-curvature relation at a plastic hinge is
A. Linear
B. Parabolic
C. Constant moment for all curvatures
D. Constant curvature for all moments
Answer : C

19. The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of
A. 75 t²/h
B. 125 t³/h²
C. 125 t²/h
D. 175 t²/h Where, t = the web thickness in mm and h = the outstand of stiffener in mm
Answer : C

20. The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : A

22. Lug angle is
A. Used with single angle member
B. Not used with double angle member
C. Used with channel member
D. All the above
Answer : D

23. If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
A. a - [b/{1 + 0.35 (b/a)}]
B. a + [b/{1 + 0.35 (b/a)}]
C. a - [b/{1 + 0.2 (b/a)}]
D. a + [b/{1 + 0.2 (b/a)}]
Answer : D

24. The web crippling due to excessive bearing stress can be avoided by
A. Increasing the web thickness
B. Providing suitable stiffener
C. Increasing the length of the bearing plates
D. None of the above
Answer : C

25. A major beam in a building structure, is known as
A. A girder
B. A floor beam
C. A main beam
D. All the above
Answer : D

26. The gross section of the web of a beam is defined as
A. Depth of the beam multiplied by its web thickness
B. Width of the flange multiplied by its web thickness
C. Sum of the flange width and depth of the beam multiplied by the web thickness
D. None of these
Answer : A

27. The effect of racking forces is considered in the design of (i) Lateral braces (ii) Chord members The correct answer is
A. Only (i)
B. Only (ii)
C. Both (i) and (ii)
D. None of the above
Answer : A

28. 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

29. 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

30. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between
A. 10° to 30°
B. 30° to 40°
C. 40° to 70°
D. 90°
Answer : C

31. The critical stress on a column for elastic buckling given by Euler's formula, is
A. f_c = ?²E/(I/r)²
B. f_c = (I/r)²/ ?E
C. f_c = (I/r)/ ?E
D. f_c = ?²E/(I/r)
Answer : A

32. Battening is preferable when the (i) Column carries axial load only (ii) Space between the two main components is not very large (iii) Column is eccentrically loaded The correct answer is
A. Only (i)
B. Only (iii)
C. (i) and (ii)
D. (ii) and (iii)
Answer : C

33. 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

34. The overlap of batten plates with the main members in welded connections should be more than
A. 3 t
B. 4 t
C. 6 t
D. 8 t Where t = thickness of the batten plate
Answer : B

35. According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than
A. d/85
B. d/200
C. d/225
D. d/250
Answer : D

36. If d is the distance between the flange angles,
A. Vertical stiffeners are provided in steel plate girders if the web is less than d/85
B. Vertical stiffeners are provided in high tensile steel plate girders if the web is less than d/175
C. Horizontal stiffeners are provided in steel plate girders if the web is less than d/200
D. All the above
Answer : D

37. In case of plastic design, the calculated maximum shear capacity of a beam as per IS: 800 shall be
A. 0.55 Aw.fy
B. 0.65 Aw.fy
C. 0.75 Aw.fy
D. 0.85 Aw.fy Where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel
Answer : A

38. Economical depth of a plate girder corresponds to
A. Minimum weight
B. Minimum depth
C. Maximum weight
D. Minimum thickness of web
Answer : A

39. Hudson's formula gives the dead weight of a truss bridge as a function of
A. Bottom chord area
B. Top chord area
C. Effective span of bridge
D. Heaviest axle load of engine
Answer : A

40. Secant formula for direct stress in compression, is applicable only for slenderness ratio upto
A. 120
B. 130
C. 140
D. 150
Answer : C

41. The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by
A. L = span
B. L = 0.85 span
C. L = 0.75 span
D. L = 0.7 span
Answer : B

42. According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to
A. 10% 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

43. 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
Answer : B

44. Outstanding length of a compression member consisting of a channel, is measured as
A. Half of the nominal width
B. Nominal width of the section
C. From the edge to the first row of rivets
D. None of these
Answer : B

45. For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
A. Bending moment at the centre of the beam
B. Half the bending moment at the centre of the beam
C. Twice the bending moment at the centre of the beam
D. None of these
Answer : A

46. For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels).
A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B

47. The area A_p of cover plates in one flange of a built up beam, is given by
A. A_p = Z_reqr + Z_beam/h
B. A_p = Z_reqr + Z_beam/A
C. A_p = Z_reqr × Z_beam/h
D. A_p = Z_reqr - Z_beam/h
Answer : D

48. In case of cantilever fillers, the ratio of the span L to depth d, should not exceed
A. 4
B. 8
C. 12
D. 16
Answer : C

49. The thickness t of a single flat lacing should not be less than
A. 1/30th length between inner end rivets
B. 1/40th length between inner end rivets
C. 1/50th length between inner end rivets
D. 1/60th length between inner end rivets
Answer : B

50. The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
A. 180
B. 200
C. 250
D. 350
Answer : A