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

1. The rivets which are heated and then driven in the field, are known
A. Power driven shop rivets
B. Power driven field rivets
C. Hand driven rivets
D. Cold driven rivets
Answer : B

2. If the depth of two column sections is equal, then the column splice is provided
A. With filler plates
B. With bearing plates
C. With filler and hearing plates
D. None of these
Answer : D

3. 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

4. If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is
A. 60
B. 70
C. 80
D. 100
Answer : C

5. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
A. 4 zones
B. 5 zones
C. 6 zones
D. 7 zones
Answer : C

6. The beam outside a wall upto floor level above it, is known as
A. Rafter
B. Purlin
C. Spandrel beam
D. Lintel
Answer : C

7. The overlap of batten plates with the main members in welded connections should be more than
A. 3 t
B. 4 t
C. 6 t
D. 8 t Where t = thickness of the batten plate
Answer : B

8. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between
A. 10° to 30°
B. 30° to 40°
C. 40° to 70°
D. 90°
Answer : C

9. Cold driven rivets range from
A. 6 to 10 mm in diameter
B. 10 to 16 mm in diameter
C. 12 to 22 mm in diameter
D. 22 to 32 mm in diameter
Answer : C

10. The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of
A. 75 t²/h
B. 125 t³/h²
C. 125 t²/h
D. 175 t²/h Where, t = the web thickness in mm and h = the outstand of stiffener in mm
Answer : C

11. If W and L are the total superimposed load and the span of a plate girder in metres, the approximate self weight (W) of the girder, is taken as
A. M = WL/100
B. M = WL/200
C. M = WL/300
D. M = WL/400
Answer : C

12. 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

13. 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

14. Rolled steel Tee-sections are used
A. As columns
B. With flat strips to connect plates in steel rectangular tanks
C. As built up sections to resist axial tension
D. None of these
Answer : B

15. 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

16. 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

17. 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

18. 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

19. According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than
A. d/85
B. d/200
C. d/225
D. d/250
Answer : D

20. Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds
A. 50 t
B. 85 t
C. 200 t
D. 250 t Where t is thickness of web
Answer : B

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

23. 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

24. 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

25. The method of design of steel framework for greatest rigidity and economy in weight, is known as
A. Simply design
B. Semi-rigid design
C. Fully rigid design
D. None of these
Answer : C

26. 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

27. Other conditions being same, the load factor in indeterminate structures is
A. Equal to load factor in determinate structures
B. More than the load factor in determinate structures
C. Less than the load factor in determinate structures
D. Unpredictable
Answer : B

28. Battening is preferable when the (i) Column carries axial load only (ii) Space between the two main components is not very large (iii) Column is eccentrically loaded The correct answer is
A. Only (i)
B. Only (iii)
C. (i) and (ii)
D. (ii) and (iii)
Answer : C

29. If d is the distance between the flange angles, the vertical stiffeners in plate girders without horizontal stiffeners, are spaced at a distance not less than
A. 0.15 d
B. 0.22 d
C. 0.33 d
D. 0.44 d
Answer : C

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

36. The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula
A. T = WL/4R
B. T = WR/8L
C. T = WL/8R
D. T = WL/2R
Answer : C

37. 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

38. Number of rivets required in a joint, is
A. Load/Shear strength of a rivet
B. Load/Bearing strength of a rivet
C. Load/Tearing strength of a rivet
D. Load/Rivet value
Answer : D

39. When a load is transferred through one surface to another surface in contact, the stress is known as
A. Tensile stress
B. Compressive stress
C. Shearing stress
D. None of these
Answer : D

40. 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

41. 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

42. Diameter of a bolt hole is usually taken as
A. Gross diameter of bolt
B. Nominal diameter + 1.5 mm
C. Nominal diameter + 2.0 mm
D. Nominal diameter of bolt
Answer : B

43. 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

44. Bolts are most suitable to carry
A. Shear
B. Bending
C. Axial tension
D. Shear and bending
Answer : C

45. An axial loaded column is supported on a slab base whose projection is 8 cm. If the intensity of pressure from concrete is 40 kg/cm² and allowable bending stress in slab base is 1890 kg/cm², the thickness (t) of the slab base, is
A. t = ?(21/64)
B. t = ?(64/21)
C. t = 21/64
D. t = 64/21
Answer : B

46. 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

47. 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

48. 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

49. In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : B

50. The permissible bearing stress in steel, is
A. 1500 kg/cm2
B. 1890 kg/cm2
C. 2025 kg/cm2
D. 2340 kg/cm2
Answer : B