1000+ Design of Steel Structures MCQ for RRB ALP [Solved]

1. 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

2. The risk coefficient k, depends on
A. Mean probable design life of structures
B. Basic wind speed
C. Both (A) and (B)
D. None of the above
Answer : C

3. 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

4. The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : C

5. If d is the distance between the flange angles,
A. Vertical stiffeners are provided in steel plate girders if the web is less than d/85
B. Vertical stiffeners are provided in high tensile steel plate girders if the web is less than d/175
C. Horizontal stiffeners are provided in steel plate girders if the web is less than d/200
D. All the above
Answer : D

6. 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

7. 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

8. 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

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

10. 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

11. For a column of height L fixed in position and direction both at its top and bottom, its effective length, is
A. L
B. 1/?2 × L
C. ½ L
D. 2L
Answer : C

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as
A. 120 mm
B. 160 mm
C. 200 mm
D.300 mm
Answer : B

21. 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

22. The slenderness ratio of lacing bars should not exceed
A. 100
B. 120
C. 145
D. 180
Answer : C

23. For steel members not exposed to weather, the thickness of steel should not be less than
A. 4.5 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B

24. The internal pressure coefficient on walls for buildings with large permeability is taken as
A. ± 0.2
B. ±0.5
C. ± 0.7
D. 0
Answer : C

25. 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

26. Steel tanks are mainly designed for
A. Weight of tank
B. Wind pressure
C. Water pressure
D. Earthquake forces
Answer : C

27. The effect of racking forces is considered in the design of (i) Lateral braces (ii) Chord members The correct answer is
A. Only (i)
B. Only (ii)
C. Both (i) and (ii)
D. None of the above
Answer : A

28. 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

29. 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

30. 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

31. Select the correct statement
A. Material cost of a rivet is higher than that of a bolt
B. Tensile strength of a bolt is lesser than that of a rivet
C. Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings
D. Riveting is less noisy than bolting
Answer : C

32. Maximum pitch of rivets, used in steel stacks, is limited to
A. 6 t
B. 10 t
C. 12 t
D. 16 t Where t is thickness of thinner plate being connected
Answer : B

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

34. 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

35. 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

36. The gross section of the web of a beam is defined as
A. Depth of the beam multiplied by its web thickness
B. Width of the flange multiplied by its web thickness
C. Sum of the flange width and depth of the beam multiplied by the web thickness
D. None of these
Answer : A

37. In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon:
A. Pitch
B. Gauge
C. Diameter of the rivet holes
D. All the above
Answer : D

38. A beam may be designed as a cased beam if
A. Section is of double open channel form with the webs not less than 40 mm apart
B. Overall depth and width of the steel section do not exceed 750 and 450 mm respectively
C. Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
D. All the above
Answer : D

39. The best arrangement to provide unified behaviour in built up steel columns is by
A. Lacing
B. Battening
C. Tie plates
D. Perforated cover plates
Answer : A

40. The ratio of longitudinal stress to strain within elastic limit, is known as
A. Modulus of elasticity
B. Shear modulus of elasticity
C. Bulk modulus of elasticity
D. All the above
Answer : A

41. The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by
A. L = span
B. L = 0.85 span
C. L = 0.75 span
D. L = 0.7 span
Answer : B

42. If R is the reaction on thebearing plate, the minimum moment of. inertia of the bearing stiffener provided at the support of a plate girder of overall depth D, the maximum thickness of the compression flange T, carrying total load W, is
A. (D²/250) × (R/W)
B. (D³T/250) × (R/W)
C. (DT/250) × (R/W)
D. (DT/250) × (W/R)
Answer : B

43. In case of timber structures, the simple bending formula M = fz may be applied for
A. Rectangular beams up to 300 mm depth
B. All rectangular beams
C. Solid circular beams only
D. All square cross-section beams
Answer : A

44. 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

45. The actual thickness of butt weld as compared to the thickness of plate is usually
A. More
B. Less
C. Equal
D. None of the above
Answer : A

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

47. Perforated cover plates are particularly suitable for built up sections consisting of
A. Channels placed back to back
B. Channels placed toe to toe
C. Four angle box section
D. All the above
Answer : C

48. The capacity of the smallest pressed steel tank is
A. 1000 litre
B. 1650 litre
C. 1950 litre
D. 2450 litre
Answer : C

49. 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

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