1000+ Design of Steel Structures MCQ for RBI Grade B officer [Solved]

1. 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

2. 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

3. 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

4. The forces acting on the web splice of a plate girder are
A. Axial forces
B. Shear and axial forces
C. Shear and bending forces
D. Axial and bending forces
Answer : C

5. 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

6. 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

7. In plastic analysis, the shape factor for circular sections, is
A. 1.5
B. 1.6
C. 1.697
D. None of these
Answer : C

8. When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
A. Two holes for each angle and one hole for the web
B. One hole for each angle and one hole for the web
C. One hole for each angle and two holes for the web
D. Two holes for each angle and two holes for the web
Answer : C

9. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than
A. d but not less than 0.20 d
B. 1.25 d but not less than 0.33 d
C. 1.5 d but not less than 0.33 d
D. 2.0 d but not less than 0.50 d
Answer : B

10. 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

11. Load factor is
A. Always equal to factor of safety
B. Always less than factor of safety
C. Always greater than factor of safety
D. Sometimes greater than factor of safety
Answer : C

12. A column splice is used to increase
A. Length of the column
B. Strength of the column
C. Cross-sectional area of the column
D. None of these
Answer : A

13. In a grillage footing, the maximum shear force occurs at the
A. Edge of grillage beam
B. Centre of base plate
C. Centre of grillage beam
D. Centre of base plate
Answer : B

14. 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

15. 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 earthquake
D. Column loads + full horizontal shear due to wind or earthquake
Answer : B

16. 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

17. 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. Lesser of 3 00 mm and 24 t Where t is thickness of thinnest outside plate or angle
Answer : A

18. The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as
A. 0.65 kN/m²
B. 0.75 kN/m²
C. 1.35 kN/m²
D. 1.50 kN/m²
Answer : A

19. In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called
A. Stringers
B. Trimmers
C. Girts
D. Lintels
Answer : C

20. 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

21. For the steel member exposed o weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels).
A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B

22. The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as
A. 1.8 L
B. L
C. 1.1 L
D. 1.5 L
Answer : C

23. According to IS : 800-1962 the permissible bending stress in steel slab plates, is
A. 1500 kg/cm²
B. 1420 kg/cm²
C. 2125 kg/cm²
D. 1890 kg/cm²
Answer : D

24. If N is the number of rivets in the joint, the strength of a riveted joint against shearing of rivets, is given by
A. P_s = N × (?/4) d² × P_s
B. P_s = N × (d × t × p_s)
C. P_s = N × (p - d) × t × P_s
D. P_s = N × (P + d) × t × p_s
Answer : A

25. Rivets connecting flange angles to cover plates in a plate girder are subjected to
A. Horizontal shear only
B. Vertical load only
C. Both (A) and (B)
D. None of the above
Answer : A

26. Horizontal stiffener in a plate girder is provided to safeguard against
A. Shear buckling of web plate
B. Compression buckling of web plate
C. Yielding
D. All of the above
Answer : B

27. As per IS: 800, in the plastic design, which of the following pairs are correctly matched?
Working Loads Load factor
(i) Dead load 1.7
(ii) Dead Load + imposed load 1.7
(iii) Dead load + load due to wind or 1.3 seismic forces
(iv) Dead load + imposed load + load 1.7 due to wind or seismic forces
Of these statements
A. (i) and (ii) are correct
B. (i), (ii) and (iii) are correct
C. (ii) and (iii) are correct
D. Only (i) is correct
Answer : A

28. 2.Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
A. 40
B. 50
C. 60
D. 70
Answer : A

29. Lacing bars in a steel column should be designed to resist
A. Bending moment due to 2.5% of the column load
B. Shear force due to 2.5% of the column load
C. 2.5% of the column load
D. Both (A) and (B)
Answer : B

30. 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

31. 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

32. Secant formula for direct stress in compression, is applicable only for slenderness ratio upto
A. 120
B. 130
C. 140
D. 150
Answer : C

33. On eccentrically loaded columns, the equivalent axial load may be obtained by
A. Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor
B. Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor
C. Dividing the sum of axial load and eccentric load by the product of the bending moment and appropriate bending factor
D. None of these
Answer : A

34. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is
A. 180
B. 200
C. 250
D. 350
Answer : D

35. Length of an outstanding leg of a vertical stiffener, may be taken equal to
A. 1/10th of clear depth of the girder plus 15 mm
B. 1/20th of clear depth of the girder plus 20 mm
C. 1/25th of clear depth of the girder plus 25 mm
D. 1/30th of clear depth of the girder plus 50 mm
Answer : C

36. 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

37. If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm², the safe load carrying capacity of the member, is
A. 10 tonnes
B. 12 tonnes
C. 15 tonnes
D. 18 tonnes
Answer : C

38. 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

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 spans are considered approximately equal if the longest span does not exceed the shortest span by more than
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : C

41. 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

42. If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
A. a - [b/{1 + 0.35 (b/a)}]
B. a + [b/{1 + 0.35 (b/a)}]
C. a - [b/{1 + 0.2 (b/a)}]
D. a + [b/{1 + 0.2 (b/a)}]
Answer : D

43. 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

44. 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

45. 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

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. The elastic strain for steel is about
A. 1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
B. 1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
C. 1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain
D. 1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
Answer : C

48. Normally, the angle of roof truss with asbestos sheets should not be less than
A. 26 ½°
B. 30°
C. 35°
D. 40°
Answer : B

49. Effective length of a column effectively 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

50. The strength of a riveted lap joint is equal to its
A. Shearing strength
B. Bearing strength
C. Tearing strength
D. Least of (a), (b) and (c)
Answer : D