Design of Steel Structures 1000+ MCQ with answer for GRE

1. 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

2. A column splice is used to increase
A. Length of the column
B. Strength of the column
C. Cross-sectional area of the column
D. None of these
Answer : A

3. The portal bracing in a truss bridge is used to
A. Transfer load from top of end posts to bearings
B. Keep the rectangular shape of the bridge cross-section
C. Stiffen the structure laterally
D. Prevent the sides-way buckling of top chord
Answer : A

4. 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

5. 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

6. Design of a riveted joint is based on the assumption:
A. Bending stress in rivets is accounted for
B. Riveted hole is assumed to be completely filled by the rivet
C. Stress in the plate in not uniform
D. Friction between plates is taken into account
Answer : B

7. 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

8. 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

9. Diameter of a rivet hole is made larger than the diameter of the rivet by
A. 1.0 mm for rivet diameter upto 12 mm
B. 1.5 mm for rivet diameter exceeding 25 mm
C. 2.0 mm for rivet diameter over 25 mm
D. None of these
Answer : C

10. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
A. 4 zones
B. 5 zones
C. 6 zones
D. 7 zones
Answer : C

11. The Indian standard code which deals with steel structures, is
A. IS : 875
B. IS : 800
C. IS : 456
D. IS : 1893
Answer : B

12. As per ISI, rolled steel beam sections are classified into
A. Two series
B. Three series
C. Four series
D. Five series
Answer : D

13. Tongue plates are provided in a steel girder at
A. The upper flange
B. The lower flange
C. The upper end of the web
D. The upper and lower ends of the web
Answer : D

14. If f_bt and f_c are the co-existent bending tensile stress and shear stress in a member, the equivalent stress f_c is
A. ?(f_bt² + f_c²)
B. ?(f_bt² + ½f_c²)
C. ?(f_bt² + 3f_c²)
D. ?(f_bt² - 3f_c²)
Answer : C

15. 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

16. For double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of
A. The section
B. The section plus area of rivet holes
C. The section minus area of rivet holes
D. The section multiplied by the area of the rivet hole
Answer : C

17. 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

18. 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

19. Bulb angles are used in
A. Column building
B. Bridge building
C. Ship building
D. Water tank building
Answer : C

20. 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

21. 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 at the other end, is
A. 1.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : D

22. 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 (c) and (b)
D. Neither (a) nor (b)
Answer : C

23. 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

24. If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is
A. 60
B. 70
C. 80
D. 100
Answer : C

25. 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

26. The main advantage of a steel member, is:
A. Its high strength
B. Its gas and water tightness
C. Its long service life
D. All the above
Answer : D

27. Rolled steel Tee-sections are used
A. As columns
B. With flat strips to connect plates in steel rectangular tanks
C. As built up sections to resist axial tension
D. None of these
Answer : B

28. 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

29. 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

30. 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

31. 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

32. Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
A. 500 mm
B. 600 mm
C. 1000 mm
D. 300 mm
Answer : C

33. 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

34. Pick up the correct statement from the following:
A. When the gauge distance is larger than the pitch, the failure of the section may occur in a zig-zag line
B. When the gauge distance is smaller than the pitch, the failure of the section may occur in a straight right angle section through the centre of rivet holes
C. When the gauge distance and pitch are both equal, the failure to the section becomes more likely as the diameter of the holes increases
D. All the above
Answer : D

35. When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption
A. Bearing plate is assumed as a short beam to transmit the axial load to the lower column section
B. Axial load is assumed to be taken by flanges
C. Load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple
D. All the above
Answer : D

36. 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
Answer : C

37. 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

38. The minimum edge distance of a rivet line connecting two or more plates, is kept equal to 37 mm plus (where t is the thickness in mm of the thinner outside plate).
A. 2 t
B. 4 t
C. 6 t
D. 8 t
Answer : B

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

40. The deflection of beams may be decreased by
A. Increasing the depth of beam
B. Increasing the span
C. Decreasing the depth of beam
D. Increasing the width of beam
Answer : A

41. 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

42. 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

43. The permissible stress in bending for rolled steel I-beams and channels, is
A. 1500 kg/cm²
B. 1575 kg/cm²
C. 945 kg/cm²
D. 1650 kg/cm²
Answer : D

44. According to IS: 800, in the Merchant Rankine formula the value of imperfection index (n) is
A. 1.0
B. 1.4
C. 1.8
D. 2.0
Answer : B

45. 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

46. Pick up the correct statement from the following:
A. Tacking rivets are used if the minimum distance between centres of two adjacent rivets exceeds 12 t or 200 mm, whichever is less
B. Tacking rivets are not considered to calculate stress
C. Tacking rivets are provided throughout the length of a compression member composed of two components back to back
D. All the above
Answer : D

47. On steel structures the dead load is the weight of
A. Steel work
B. Material fastened to steel work
C. Material supported permanently
D. All the above
Answer : D

48. 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
Answer : D

49. 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

50. 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