IBPS PO - Design of Steel Structures 1000+ MCQ [Solved] PDF Download

1. 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

2. The beams supporting the steps of a stair are generally known as
A. Headers
B. Trimmers
C. Stringers
D. Spandrel beams
Answer : C

3. A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is generally known as
A. A tie
B. A tie member
C. A tension member
D. All the above
Answer : D

4. 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

5. The bending moment for filler joists at the middle of an intermediate span, is
A. WL²/10
B. - WL²/10
C. - WL²/12
D. WL²/12
Answer : D

6. 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

7. The most economical section for a column, is
A. Rectangular
B. Solid round
C. Flat strip
D. Tubular section
Answer : D

8. 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

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

10. 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

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

12. 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

13. For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?
A. Equal angles back to back
B. Unequal legged angles with long legs back to back
C. Unequal legged angles with short legs back to back
D. Both (B) and (C)
Answer : B

14. 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

15. 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

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. When the ratio of the moment M to axial load P is greater than L/6, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by
A. y = (L/3) - (M/P)
B. y = (L/2) - (P/M)
C. y = (L/2) + (M/P)
D. y = (L/3) + (M/P)
Answer : B

18. Study the following statements. (i) Top lateral bracing prevents the sides-way buckling of the chord. (ii) Sway bracing keeps the rectangular shape of the bridge crosssection. (iii) Sway bracing transfers the load from top of end posts to bearings. The correct answer is
A. Only (i)
B. Both (i) and (ii)
C. Both (i) and (iii)
D. All (i), (ii) and (iii)
Answer : B

19. 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

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

21. Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
A. Bearing and shear
B. Bending and shear
C. Bearing and bending
D. Bearing, shear and bending
Answer : D

22. 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

23. For rivets in tension with countersunk heads, the tensile value shall be
A. Reduced by 25 %
B. Reduced by 33.3%
C. Increased by 25 %
D. Increased by 33.3 %
Answer : B

24. A steel beam supporting loads from the floor slab as well as from wall is termed as
A. Stringer beam
B. Lintel beam
C. Spandrel beam
D. Header beam
Answer : C

25. 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

26. 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

27. According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as
A. 0.67 L
B. 0.8 L
C. L
D. 1.5 L
Answer : B

28. 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

29. 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

30. 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

31. 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

32. As per IS : 800, for compression flange, the outstand of flange plates should not exceed
A. 12 t
B. 16 t
C. 20 t
D. 25 t Where t = thickness of thinnest flange plate
Answer : B

33. Tacking rivets in tension members, are provided at a pitch in line not exceeding
A. 25 cm
B. 50 cm
C. 75 cm
D. 100 cm
Answer : D

34. With a percentage increase of carbon in steel, decreases its
A. Strength
B. Hardness
C. Brittleness
D. Ductility
Answer : D

35. 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

36. For a steel member of slenderness ratio 350, the allowable stress is 76 kg/cm2 if it is
A. HTW grade of thickness exceeding 32 mm
B. HT grade of thickness exceeding 45 mm
C. HT grade of thickness not exceeding 45 mm
D. All the above
Answer : D

37. 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

38. 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

39. Cold driven rivets range from
A. 6 to 10 mm in diameter
B. 10 to 16 mm in diameter
C. 12 to 22 mm in diameter
D. 22 to 32 mm in diameter
Answer : C

40. 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

41. 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

42. Live load
A. Varies in magnitude
B. Varies in position
C. Is expressed as uniformly distributed load
D. All the above
Answer : D

43. The equivalent axial tensile load Pe, which produces an average axial tensile stress in the section equivalent to the combined stres 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

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. If W and L are the total superimposed load and the span of a plate girder in metres, the approximate self weight (W) of the girder, is taken as
A. M = WL/100
B. M = WL/200
C. M = WL/300
D. M = WL/400
Answer : C

46. 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

47. The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is
A. 10 m
B. 20 m
C. 25 m
D. 50 m
Answer : A

48. 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

49. 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

50. 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