Design of Steel Structures 1000+ MCQ with answer for ISRO Recruitment

1. 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

2. Normally, the angle of roof truss with asbestos sheets should not be less than
A. 26 ½°
B. 30°
C. 35°
D. 40°
Answer : B

3. The centrifugal force due to curvature of track is assumed to act on the bridge at a height of
A. 1.23 m above the rail level
B. 1.50 m above the rail level
C. 1.83 m above the rail level
D. 2.13 m above the rail level
Answer : C

4. 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

5. Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds
A. 50 t
B. 85 t
C. 200 t
D. 250 t Where t is thickness of web
Answer : B

6. For determination of allowable stress in axial compression, Indian Standard Institution has adopted
A. Euler's formula
B. Rankine formula
C. Perry Robertson formula
D. Secant formula
Answer : D

7. The maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is
A. 1500 kg/cm²
B. 1420 kg/cm²
C. 1650 kg/cm²
D. 2285 kg/cm²
Answer : C

8. Minimum pitch provided in riveted steel tanks is
A. 1.5 d
B. 2.0 d
C. 2.5 d
D. 3.0 d Where d is diameter of rivets
Answer : D

9. The effective length of a weld, is taken as the actual length
A. Minus the size of weld
B. Minus twice the size of weld
C. Plus the size of weld
D. Plus twice the size of weld
Answer : B

10. 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

11. The minimum pitch of rivet holes of diameter d should not be less than
A. d
B. 1.25 d
C. 1.5 d
D. 2.5 d
Answer : D

12. 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
Answer : C

13. For a standard 45° fillet, the ratio of size of fillet to throat thickness is
A. 1 : 1
B. 1 : ?2
C. ?2 : 1
D. 2 : 1
Answer : C

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

15. 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

16. Bolts are most suitable to carry
A. Shear
B. Bending
C. Axial tension
D. Shear and bending
Answer : C

17. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:
A. 4.5 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : C

18. 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

19. 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

20. 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

21. 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

22. 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

23. Effective length of a column effectively held in position and restrained in direction at one end but neither held in position nor restrained in direction atthe other end, is
A. 1.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : D

24. Bearing stiffener in a plate girder is used to
A. Transfer the load from the top flange to the bottom one
B. Prevent buckling of web
C. Decrease the effective depth of web
D. Prevent excessive deflection
Answer : B

25. Gantry girders are designed to resist
A. Lateral loads
B. Longitudinal loads and vertical loads
C. Lateral, longitudinal and vertical loads
D. Lateral and longitudinal loads
Answer : C

26. 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

27. Shear buckling of web in a plate girder is prevented by using
A. Vertical intermediate stiffener
B. Horizontal stiffener at neutral axis
C. Bearing stiffener
D. None of the above
Answer : A

28. The critical load for a column of length I hinged at both ends and having flexural rigidity El, is given by
A. P_c = ?²EI/l²
B. P_c = ?EI/l²
C. P_c = ?EI/I²
D. None of these
Answer : A

29. In double lacing, the thickness t of flat lacing is
A. t < 1/40 th length between inner end rivets
B. t < 1/50 th length between inner end rivets
C. t < 1/60 th length between inner end rivets
D. t < 1/70 th length between inner end rivets
Answer : C

30. A web plate is called unstiffened if the ratio of clear depth to thickness is less than
A. 35
B. 50
C. 65
D. 85
Answer : D

31. The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
A. 180 t
B. 220 t
C. 230 t
D. 270 t
Answer : D

32. 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

33. 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

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 side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula
A. T = WL/4R
B. T = WR/8L
C. T = WL/8R
D. T = WL/2R
Answer : C

36. 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

37. Perforated cover plates are particularly suitable for built up sections consisting of
A. Channels placed back to back
B. Channels placed toe to toe
C. Four angle box section
D. All the above
Answer : C

38. 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

39. The maximum spacing of vertical stiffeners is
A. 1.33 d
B. 1.25 d
C. 1.5 d
D. 1.75 d Where d is the distance between flange angles
Answer : C

40. 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

41. 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

42. The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is
A. 180
B. 200
C. 250
D. 300
Answer : C

43. Stiffeners are used in a plate girder
A. To reduce the compressive stress
B. To reduce the shear stress
C. To take the bearing stress
D. To avoid bulking of web plate
Answer : D

44. 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

45. 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

46. Working shear stress on the gross area of a rivet as recommended by Indian Standards, is
A. 785 kg/cm²
B. 1025 kg/cm²
C. 2360 kg/cm²
D. None of these
Answer : B

47. 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

48. The sway bracing is designed to transfer
A. 2Vi % of the top panel wind load to bottom bracing
B. 10% of the top panel wind load to bottom bracing
C. 25% of the top panel wind load to bottom bracing
D. 50% of the top panel wind load to bottom bracing
Answer : D

49. The net area of round bars to resist the tension, is the area of cross section at
A. Mid-section
B. Root of the thread
C. Difference of (a) and (b)
D. None of these
Answer : B

50. 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