Design of Steel Structures 1000+ MCQ with answer for SBI Clerk

1. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be
A. 16 mm
B. 20 mm
C. 24 mm
D. 27 mm
Answer : C

2. Lug angle is
A. Used with single angle member
B. Not used with double angle member
C. Used with channel member
D. All the above
Answer : D

3. 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

4. The web crippling due to excessive bearing stress can be avoided by
A. Increasing the web thickness
B. Providing suitable stiffener
C. Increasing the length of the bearing plates
D. None of the above
Answer : C

5. The allowable stress in axial tension is generally kept less if thickness of the member is more than
A. 10 mm
B. 12 mm
C. 15 mm
D. 20 mm
Answer : D

6. 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

7. 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

8. The equivalent axial load may be defined as the load which produces a stress equal to
A. Maximum stress produced by the eccentric load
B. Maximum stressed fibre
C. Bending stress
D. None of these
Answer : A

9. 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

10. 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

11. The allowable shear stress in the web of mild steel beams decreases with
A. Decrease in h/t ratio
B. Increase in h/t ratio
C. Decrease in thickness
D. Increase in height Where 'h' is height and t is thickness
Answer : B

12. 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

13. 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

14. The channels get twisted symmetrically with regard to its axis
A. Parallel to flanges
B. Parallel to web
C. Perpendicular to flanges
D. Perpendicular to web
Answer : B

15. The effective length of a double angle strut with angles placed back to back and connected to both the sides of a gusset plate, by not less than two rivets, is
A. 0.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : C

16. 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

17. The economical depth d of a web plate in which allowable bearing stress is f_b, and the maximum bending moment is M, as suggested by Rawater and Clark, is
A. d = ?(M/f_b)
B. d = 1.5 ?(M/f_b)
C. d = 2.5 ?(M/f_b)
D. d = 4.5 ?(M/f_b)
Answer : D

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

19. 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

20. Pick up the correct statement from the following:
A. Loaded columns are supported on column bases
B. Column bases transmit the column load to the concrete foundation
C. Column load is spread over a large area on concrete
D. All the above
Answer : D

21. The maximum permissible span of asbestos cement sheets is
A. 650 mm
B. 810 mm
C. 1250 mm
D. 1680 mm
Answer : D

23. If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A. A = My/fr²
B. A = My²/fr²
C. A = My/fr
D. A = My/f²r²
Answer : A

24. 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

25. 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

26. For a cantilever beam of length L built-in at the support and restrained against torsion at the free end, the effective projecting length l is
A. l = 0.7 L
B. l = 0.75 L
C. l = 0.85 L
D. l = 0.5 L
Answer : B

27. The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
A. 180
B. 200
C. 250
D. 350
Answer : A

28. 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

29. 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

30. The effective length of a battened column is increased by
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : B

31. The slenderness ratio of a column is zero when its length
A. Is zero
B. Is equal to its radius of gyration
C. Is supported on all sides throughout its length
D. Is between the points of zero moments
Answer : D

32. 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

33. The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is upto a height of
A. The effective span
B. 1.25 times the effective span
C. 1.50 times the effective span
D. 2.0 times the effective span
Answer : B

34. 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

35. Net sectional area of a tension member, is equal to its gross section area
A. Plus the area of the rivet holes
B. Divided by the area of rivet holes
C. Multiplied by the area of the rivet holes
D. None of these
Answer : D

36. 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

37. 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

38. When a large value of radius of gyration is not required
A. Channels are placed back to back
B. Channel flanges are kept inward
C. Channel flanges are kept outward
D. None of these
Answer : B

39. 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

40. The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as
A. ½ of the thickness of thicker part
B. ¾ of the thickness of thicker part
C. ¾ of the thickness of thinner part
D. 7/8 of the thickness of thinner part
Answer : D

41. 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

42. According to IS Specifications, the maximum pitch of rivets in compression is
A. Lesser of 200 mm and 12 t
B. Lesser of 200 mm and 16 t
C. Lesser of 300 mm and 32 t
D. Lsser of 3 00 mm and 24 t Where t is thickness of thinnest outside plate or angle
Answer : A

43. 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

44. 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

45. 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

46. The least dimension in case of a circular column of diameter D is taken as
A. 0.5 D
B. 0.68 D
C. 0.88 D
D. D
Answer : C

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. 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

49. For eccentrically loaded columns, the bending factor is
A. Cross-sectional area of column/Radius of gyration
B. Radius of gyration/Cross-sectional area of column
C. Cross-sectional area of column/Section modulus of the section
D. Section modulus of the section/Cross-sectional area of column
Answer : C

50. 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