IBPS Clerk - Design of Steel Structures 1000+ MCQ [Solved] PDF Download

1. 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

2. Tacking rivets in tension members, are provided at a pitch in line not exceeding
A. 25 cm
B. 50 cm
C. 75 cm
D. 100 cm
Answer : D

3. Poisson's ratio for steel within elastic limit, ranges from
A. 0.15 to 0.20
B. 0.25 to 0.24
C. 0.25 to 0.33
D. 0.33 to 0.35
Answer : C

4. 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

5. 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

6. A fillet weld may be termed as
A. Mitre weld
B. Concave weld
C. Convex weld
D. All the above
Answer : D

7. 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

8. 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

9. The rolled steel I-sections are most commonly used as beams because these provide
A. Large moment of inertia with less cross-sectional area
B. Large moment of resistance as compared to other section
C. Greater lateral stability
D. All the above
Answer : D

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

11. 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

12. The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is
A. 26,000 kg
B. 26,025 kg
C. 26,050 kg
D. 26,075 kg
Answer : D

13. 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

14. Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
A. Bearing and shear
B. Bending and shear
C. Bearing and bending
D. Bearing, shear and bending
Answer : D

15. Slenderness ratio of a compression member is
A. Moment of inertia/Radius of gyration
B. Effective length/Area of cross-section
C. Radius of gyration/Effective length
D. Radius of gyration/ Area of cross-section
Answer : C

16. 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

17. A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm² produces a strain of 0.004 cm. If Young's modulus of steel is 2.1 × kg/cm², the bar is
A. In the elastic range
B. In the plastic range
C. At yield point
D. None of these
Answer : A

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. Tongue plates are provided in a steel girder at
A. The upper flange
B. The lower flange
C. The upper end of the web
D. The upper and lower ends of the web
Answer : D

27. 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

28. A compression member consisting of angle sections may be a
A. Continuous member
B. Discontinuous single angle strut
C. Discontinuous double angle strut
D. All the above
Answer : D

29. For the steel member exposed to 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

30. The maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is
A. 1500 kg/cm²
B. 1420 kg/cm²
C. 1650 kg/cm²
D. 2285 kg/cm²
Answer : C

31. 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

32. The average shear stress for rolled steel beam section, is
A. 845 kg/cm²
B. 945 kg/cm²
C. 1025 kg/cm²
D. 1500 kg/cm²
Answer : B

33. 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

34. Lug angles
A. Are used to reduce the length of connection
B. Are unequal angles
C. Increases shear lag
D. All the above
Answer : A

35. 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

36. A steel beam supporting loads from the floor slab as well as from wall is termed as
A. Stringer beam
B. Lintel beam
C. Spandrel beam
D. Header beam
Answer : C

37. The minimum thickness of plates in a steel stack should be
A. 4 mm
B. 5 mm
C. 6 mm
D. 8 mm
Answer : C

38. 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

39. A riveted joint may experience
A. Shear failure
B. Shear failure of plates
C. Bearing failure
D. All the above
Answer : D

40. A circular column section is generally not used in actual practice because
A. It is uneconomical
B. It cannot carry the load safely
C. It is difficult to connect beams to the round sections
D. All of the above
Answer : C

41. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (Where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
A. Is at the maximum distance from CG of the rivet group
B. Is at the minimum distance from CG of the rivet group
C. Gives the maximum angle between the two forces Fa and Fm
D. Gives the minimum angle between the two forces Fa and Fm
Answer : D

42. For simply supported beams, the maximum permitted deflection, is
A. 1/325 of the span
B. 1/350 of the span
C. 1/375 of the span
D. 1/400 of the span
Answer : A

44. 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

45. 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

46. 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

47. 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

48. A beam is defined as a structural member subjected to
A. Axial loading
B. Transverse loading
C. Axial and transverse loading
D. None of these
Answer : B

49. 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

50. 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