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

1. The slenderness ratio of a column supported throughout its length by a masonry wall is
A. Zero
B. 10
C. 100
D. Infinity
Answer : A

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

3. 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

4. The use of tie plates in laced columns is
A. Prohibited
B. Not prohibited
C. Permitted at start and end of lacing system only
D. Permitted between two parts of the lacing
Answer : C

5. 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

6. 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

7. Bearing stiffeners are provided at (i) The supports (ii) The mid span (iii) The point of application of concentrated loads The correct answer is
A. Only (i)
B. Both (i) and (ii)
C. Both (i) and (iii)
D. (i), (ii) and (iii)
Answer : C

8. 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

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

10. 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

11. The range of economical spacing of trusses varies from
A. L/3 to L/5
B. L/4 to 2L/5
C. L/3 to L/2
D. 2L/5 to 3L/5, where L is span
Answer : A

12. 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

13. Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is
A. 10
B. 11
C. 12
D. 13
Answer : D

14. If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is
A. (A/L) + (3Ad/L²)
B. (A/L) + (6Ad/L²)
C. (A/L) - (6Ad/L²)
D. (A/L) - (3Ad/L²)
Answer : B

15. 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

16. 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

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

18. 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

19. The most commonly used sections in lateral system to carry shear force in built up columns, are
A. Rolled steel flats
B. Rolled angles
C. Rolled channels
D. All the above
Answer : D

20. If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called
A. Deck type
B. Through type
C. Half through type
D. Double deck type
Answer : C

21. 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

22. Bending compressive and tensile stresses respectively are calculated based on
A. Net area and gross area
B. Gross area and net area
C. Net area in both cases
D. Gross area in both cases
Answer : B

23. 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

24. The ratio of shearing stress to shearing strain within elastic limit, is known as
A. Modulus of elasticity
B. Shear modulus of elasticity
C. Bulk modulus of elasticity
D. Tangent modulus of elasticity
Answer : B

25. The stress in the wall of a thin cylinder subjected to internal pressure, is
A. Hoop compression
B. Shear
C. Torsional shear
D. Hoop tension
Answer : D

26. 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

27. The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
A. Pitch of rivet
B. Gauge distance of rivet
C. Staggered pitch
D. All the above
Answer : C

28. 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

29. 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

30. The main type of butt joints, is a double cover
A. Shear riveted joint
B. Chain riveted joint
C. Zig-zag riveted joint
D. All the above
Answer : D

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

32. 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

33. 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

34. 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

35. 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

36. 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

37. 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

38. The permissible stress to which a structural member can be subjected to, is known as
A. Bearing stress
B. Working stress
C. Tensile stress
D. Compressive stress
Answer : B

39. The tensile strength of mild steel for bolts and nuts should not be less than
A. 32 kg/mm²
B. 36 kg/mm²
C. 40 kg/mm²
D. 44 kg/mm²
Answer : D

40. Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to
A. 50 %
B. 60 %
C. 70 %
D. 80 %
Answer : D

41. 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

42. The bracing between two columns of a steel tank will be designed to resist
A. Horizontal shear due to wind or earthquake only
B. Horizontal, shear due to wind or earthquake + 2.5% of column loads
C. Column loads + 2.5% of horizontal shear due to wind or earhquake
D. Column loads + full horizontal shear due to wind or earthquake
Answer : B

43. The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at
A. The neutral axis of the section
B. 2/3rd of the depth of the neutral axis from the compression flange
C. 2/5th of the depth of the neutral axis from the compression flange
D. 2/5th of the height of the neutral axis from tension flange
Answer : C

44. In a fillet weld placed on the sides of the base, the metal experiences
A. Shear
B. Tension
C. Compression
D. All the above
Answer : D

45. 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

46. 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

47. 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

48. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate
A. Fully by direct bearing
B. Fully through fastenings
C. 50% by direct bearing and 50% through fastenings
D. 75% by direct bearing and 25% through fastenings
Answer : C

49. 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

50. 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