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

1. Effective length of a column effectively held in position and restrained in direction at both ends, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : B

2. Factor of safety is the ratio of
A. Yield stress to working stress
B. Tensile stress to working stress
C. Compressive stress to working stress
D. Bearing stress to working stress
Answer : A

3. The beam outside a wall upto floor level above it, is known as
A. Rafter
B. Purlin
C. Spandrel beam
D. Lintel
Answer : C

4. 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

5. 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

6. In a built up beam actual bending compressive stress f_bc is given by (when y₁ is the distance of the edge of the beam from the neutral axis).
A. f_bc = (M/I_xx) × y?
B. f_bc = (I_xx/M) × y?
C. f_bc = (I_xx/M) + y?
D. f_bc = (M/I_xx) + y?
Answer : A

7. The minimum width B of a solid casing for a cased beam, is equal to
A. B = b + 25 mm
B. B = b + 50 mm
C. B = b + 75 mm
D. B = b + 100 mm
Answer : D

8. A butt weld is specified by
A. Effective throat thickness
B. Plate thickness
C. Size of weld
D. Penetration thickness
Answer : A

9. 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

10. 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

11. Diameter of a bolt hole is usually taken as
A. Gross diameter of bolt
B. Nominal diameter + 1.5 mm
C. Nominal diameter + 2.0 mm
D. Nominal diameter of bolt
Answer : B

12. 2.Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
A. 40
B. 50
C. 60
D. 70
Answer : A

13. Pick up the correct statement from the following:
A. The minimum pitch should not be less than 2.5 times the gross diameter of the river
B. The minimum pitch should not be less than 12 times the gross diameter of the rivet
C. The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression
D. All the above
Answer : A

14. The failure of a web plate takes place by yielding if the ratio of the clear depth to thickness of the web, is less than
A. 45
B. 55
C. 62
D. 82
Answer : D

15. The effective length of a double angle strut with angles placed back to back and connected to both the sides of a gusset plate, by not less than two rivets, is
A. 0.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : C

16. 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

17. The spans are considered approximately equal if the longest span does not exceed the shortest span by more than
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : C

18. 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

19. For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as
A. Zero
B. ±0.2 p
C. ± 0.5 p
D. ±0.7 p Where p is basic wind pressure
Answer : B

20. 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

21. In a grillage footing, the maximum shear force occurs at the
A. Edge of grillage beam
B. Centre of base plate
C. Centre of grillage beam
D. Centre of base plate
Answer : B

22. If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is
A. r = I/A
B. r = ?(I/A)
C. r = ?(I/A)
D. r = ?(A/I)
Answer : B

23. 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

24. If the depth of two column sections is equal, then the column splice is provided
A. With filler plates
B. With bearing plates
C. With filler and hearing plates
D. None of these
Answer : D

25. 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

26. When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
A. Two holes for each angle and one hole for the web
B. One hole for each angle and one hole for the web
C. One hole for each angle and two holes for the web
D. Two holes for each angle and two holes for the web
Answer : C

27. 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

28. If P is the wind pressure in kg/cm², v is the velocity in km/hour and K is a constant of proportionality, then
A. P = K/v²
B. v = K/P²
C. P = Kv²
D. P = Kv
Answer : C

29. 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

30. Water pressure in a 80 cm water main is 10 kg/cm². The minimum thickness of the metal required for the water main, not to be stressed more than 200 kg/cm², is
A. 1 cm
B. 1.5 cm
C. 2 cm
D. 2.5 cm
Answer : C

31. A riveted joint may experience
A. Shear failure
B. Shear failure of plates
C. Bearing failure
D. All the above
Answer : D

32. The internal pressure coefficient on walls for buildings with large permeability is taken as
A. ± 0.2
B. ±0.5
C. ± 0.7
D. 0
Answer : C

33. 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

34. Which of the following conditions is to be satisfied both in elastic and plastic analysis?
A. Equilibrium condition
B. Yield condition
C. Plastic moment condition
D. Mechanism condition
Answer : A

35. To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be
A. < L/3
B. < L/6
C. > L/3
D. > L/6
Answer : B

36. 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
Answer : B

37. The effective length of a fillet weld should not be less than
A. Two times the weld size
B. Four times the weld size
C. Six times the weld size
D. Weld size
Answer : B

38. Rise of a Jack arch is kept about
A. 1/2 to 1/3 of the span
B. 1/3 to 1/4 of the span
C. 1/4 to 1/8 of the span
D. 1/8 to 1/12 of the span
Answer : D

39. The best arrangement to provide unified behaviour in built up steel columns is by
A. Lacing
B. Battening
C. Tie plates
D. Perforated cover plates
Answer : A

40. The heaviest I-section for same depth is
A. ISMB
B. ISLB
C. ISHB
D. ISWB
Answer : C

41. Spans of continuous fillers are considered approximately equal if the longest span does not exceed the shortest span by more than
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : C

42. The actual thickness of butt weld as compared to the thickness of plate is usually
A. More
B. Less
C. Equal
D. None of the above
Answer : A

43. A beam may be designed as a cased beam if
A. Section is of double open channel form with the webs not less than 4 mm apart
B. Overall depth and width of the steel section do not exceed 750 and 450 mm respectively
C. Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
D. All the above
Answer : D

44. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed
A. 180
B. 200
C. 300
D. 350
Answer : D

45. 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

46. The main assumption of the method of simple design of steel frame work, is:
A. Beams are simply supported
B. All connections of beams, girders and trusses are virtually flexible
C. Members in compression are subjected to forces applied at appropriate eccentricities
D. All the above
Answer : D

47. According to IS: 800-1962, the coefficient of expansion of steel per degree centigrade per unit length, is taken as
A. 0.000008
B. 0.000010
C. 0.000012
D. 0.000014
Answer : C

48. 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 onefortieth of its length between inner end rivets
D. All the above
Answer : D

49. To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is
A. 10 %
B. 13 %
C. 15 %
D. 18 %
Answer : B

50. For simply supported beams, the maximum permitted deflection, is
A. 1/325 of the span
B. 1/350 of the span
C. 1/375 of the span
D. 1/400 of the span
Answer : A