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

1. Hudson's formula gives the dead weight of a truss bridge as a function of
A. Bottom chord area
B. Top chord area
C. Effective span of bridge
D. Heaviest axle load of engine
Answer : A

2. 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

3. 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

4. The mechanism method and the statical method give
A. Lower and upper bounds respectively on the strength of structure
B. Upper and lower bounds respectively on the strength of structure
C. Lower bound on the strength of structure
D. Upper bound on the strength of structure
Answer : B

5. For a cantilever beam of length L continuous at the support and unrestrained against torsion at the support and free at the end, the effective length l is equal to
A. l = L
B. l = 2L
C. l = 0.5L
D. l = 3L
Answer : D

6. 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

7. 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

8. 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

9. When the length of a tension member is too long
A. A wire rope is used
B. A rod is used
C. A bar is used
D. A single angle is used
Answer : C

10. 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

11. 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

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. If the depth of the section of an upper column is smaller than the lower column
A. Filler plates are provided with column splice
B. Bearing plates are provided with column splice
C. Filler plates and bearing plates are provided with column splice
D. None of these
Answer : D

14. Assuming the values of maximum deviation ?P and ?E to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is
A. 1.00
B. 0.67
C. 1.67
D. 2.67
Answer : C

15. 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

16. When two plates are placed end to end and are joined by two cover plates, the joint is known as
A. Lap joint
B. Butt joint
C. Chain riveted lap joint
D. Double cover butt joint
Answer : D

17. Efficiency of a riveted joint is defined as the ratio of
A. Least strength of a riveted joint to the strength of solid plate
B. Greatest strength of a riveted joint to the strength of solid plate
C. Least strength of a riveted plate to the greatest strength of the riveted joint
D. All the above
Answer : D

18. 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

19. 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

20. If M is the moment due to a couple in a bearing plate whose width is b and allowable bendingstress 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

21. Effective sectional area of a compression member is:
A. Gross sectional area - area of rivet hole
B. Gross sectional area + area of rivet hole
C. Gross sectional area × area of rivet hole
D. Gross sectional area + area of rivet hole
Answer : A

22. 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

23. With usual notations of the letters, the shear stress f_s at any point of the cross-section is given by
A. f_s =FQ/It
B. f_s =Ft/IQ
C. f_s =It/FQ
D. f_s =IF/Qt
Answer : A

24. The mechanism method of plastic analysis satisfies
A. Equilibrium and mechanism conditions
B. Equilibrium and plastic moment conditions
C. Mechanism and plastic moment conditions
D. Equilibrium condition only
Answer : A

25. 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

26. The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as
A. Bending moment
B. Moment of resistance
C. Flexural stress moment
D. None of these
Answer : B

27. 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

28. The shape factor of an isosceles triangle for bending about the axis parallel to the base is:
A. 1.5
B. 1.7
C. 2.0
D. 2.34
Answer : D

29. A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as
A. Column
B. Stanchion
C. Post
D. All the above
Answer : D

30. 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

31. Which of the following types of riveted joint is free from bending stresses?
A. Lap joint
B. Butt joint with single cover plate
C. Butt joint with double cover plates
D. None of the above
Answer : C

32. If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as
A. 0
B. 0.5
C. Between 0.5 and 1.0
D. 1.0
Answer : C

33. 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

34. 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

35. When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
A. Black bolt
B. Ordinary unfinished bolt
C. Turned and fitted bolt
D. High strength bolt
Answer : D

36. 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

37. 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

38. To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to 2P/BL, the ratio of the moment M to the axial load P should be
A. L/2
B. L/3
C. L/4
D. L/6
Answer : D

39. The cross-section of a standard fillet is a triangle whose base angles are
A. 45° and 45°
B. 30° and 60°
C. 40° and 50°
D. 20° and 70°
Answer : A

40. 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

41. The number of seismic zones in which the country has been divided is
A. 3
B. 5
C. 6
D. 7
Answer : B

42. The effective length of a compression member of length L, 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

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

44. The ratio of plastic section modulus to elastic section modulus
A. Is equal to 1
B. Is always less than 1
C. Is always greater than 1
D. Can be less than 1
Answer : C

45. 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

46. 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

47. 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

48. 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

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

50. 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