Quiznetik

Design of Steel Structures | Set 2

1. 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

Correct : D. 2 l

2. The equivalent axial load may be defined as the load which produces a stress equal to

Correct : A. maximum stress produced by the eccentric load

3. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as

Correct : B. 160 mm

4. The connection of one beam to another beam by means of an angle at the bottom and an angle at the top, is known as

Correct : C. seated connection

5. The channels get twisted symmetrically with regard to its axis

Correct : B. parallel to web

6. Bolts are most suitable to carry

Correct : C. axial tension

7. Rolled steel angle sections are classified as

Correct : D. all the above

8. According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to

Correct : C. 2.5% of the axial load

9. The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as

Correct : C. 1.1 l

10. The method of design of steel framework for greatest rigidity and economy in weight, is known as

Correct : C. fully rigid design

11. For a cantilever beam of length built-in at the support and restrained against torsion at the free end, the effective projecting length is

Correct : B. l = 0.75 l

12. Economical depth of a plate girder corresponds to

Correct : A. minimum weight

13. Slenderness ratio of a compression member is

Correct : C. radius of gyration/effective length

14. The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to

Correct : D. 180 t

15. Web crippling generally occurs at the point where

Correct : C. concentrated loads act

16. The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is

Correct : A. 10 m

17. If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than

Correct : C. 1.5 d

18. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than

Correct : B. 1.25 d but not less than 0.33 d

19. The allowable tensile stress in structural mild steel plates for steel tank is assumed as

Correct : B. 105.5 mpa on net area

20. A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than

Correct : C. both (c) and (b)

21. 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

Correct : D. 26,075 kg

22. For a column of height fixed in position and direction both at its top and bottom, its effective length, is

Correct : C. ½ l

23. As per ISI, rolled steel beam sections are classified into

Correct : D. five series

24. Shape factor is a property which depends

Correct : C. only on the geometry of the section

25. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed

Correct : D. 350

26. Lug angles

Correct : A. are used to reduce the length of connection

27. The Indian standard code which deals with steel structures, is

Correct : B. is : 800

28. Under a concentrated load, bearing stress fb in a beam is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).

Correct : B. fb = w/(b + 2h tw

29. When the axis of load lies in the plane of rivet group, then the rivets are subjected to

Correct : A. only shear stresses

30. For double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of

Correct : C. the section minus area of rivet holes

31. The beam outside a wall upto floor level above it, is known as

Correct : C. spandrel beam

32. In the cross-section of a weld, throat is the

Correct : A. minimum dimension

33. The rivets which are heated and then driven in the field, are known

Correct : B. power driven field rivets

34. According to IS: 800, in the Merchant Rankine formula the value of imperfection index (n) is

Correct : B. 1.4

35. When a large value of radius of gyration is not required

Correct : B. channel flanges are kept inward

36. The ratio of hydrostatic stress to the volumetric strain within the elastic range, is called

Correct : D. all the above

37. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is

Correct : B. 6 mm

38. 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

Correct : C. 0.33 d

39. Long column is one

Correct : D. which has a ratio of effective length and least lateral dimension more than 15

40. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be

Correct : B. 2

41. When the length of a tension member is too long

Correct : C. a bar is used

42. In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called

Correct : C. girts

43. The minimum thickness of plates in a steel stack should be

Correct : C. 6 mm

44. To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be

Correct : B. < l/6

45. A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is generally known as

Correct : D. all the above

46. Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for

Correct : D. bearing, shear and bending

47. According to the Unwin's formula, if is thickness of the plate in mm, the nominal diameter of the rivet, is

Correct : C. d = 1.91 t

48. The ratio of plastic section modulus to elastic section modulus

Correct : C. is always greater than 1

49. Bulb angles are used in

Correct : C. ship building

50. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus

Correct : D. 1.6 mm

51. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:

Correct : C. 8 mm

52. For determination of allowable stress in axial compression, Indian Standard Institution has adopted

Correct : D. secant formula

53. Rolled steel beams are:

Correct : D. all the above

54. According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than

Correct : D. d/250

55. A web plate is called unstiffened if the ratio of clear depth to thickness is less than

Correct : D. 85

56. A butt weld is specified by

Correct : A. effective throat thickness

57. The most economical section for a column, is

Correct : D. tubular section

58. In rolled steel beams, shear force is mostly resisted by

Correct : A. web only

59. If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be

Correct : B. 60 mm

60. The minimum edge distance of a rivet line connecting two or more plates, is kept equal to 37 mm plus (where t is the thickness in mm of the thinner outside plate).

Correct : B. 4 t

61. For simply supported beams, the maximum permitted deflection, is

Correct : A. 1/325 of the span

62. The rolled steel I-sections are most commonly used as beams because these provide

Correct : D. all the above

63. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into

Correct : C. 6 zones

64. Net sectional area of a tension member, is equal to its gross section area

Correct : D. none of these

65. For a single section used as a tension member, the given area is assumed

Correct : C. 40% to 50% in excess of the net area

66. The effective length of a weld, is taken as the actual length

Correct : B. minus twice the size of weld

67. The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).

Correct : D. 8 d

68. The shape factor of an isosceles triangle for bending about the axis parallel to the base is:

Correct : D. 2.34

69. Rolled steel Tee-sections are used

Correct : B. with flat strips to connect plates in steel rectangular tanks

70. Which of the following types of riveted joint is free from bending stresses?

Correct : C. butt joint with double cover plates

71. The beams supporting the steps of a stair are generally known as

Correct : C. stringers

72. Poisson's ratio for steel within elastic limit, ranges from

Correct : C. 0.25 to 0.33

73. The minimum width B of a solid casing for a cased beam, is equal to

Correct : D. b = b + 100 mm

74. Horizontal stiffener in a plate girder is provided to safeguard against

Correct : B. compression buckling of web plate

75. 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

Correct : C. m = wl/300

76. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is

Correct : D. 350

77. Normally, the angle of roof truss with asbestos sheets should not be less than

Correct : B. 30°

78. An imaginary line along which rivets are placed, is known as

Correct : D. all the above

79. Pick up the correct statement from the following:

Correct : D. all the above

80. The capacity of the smallest pressed steel tank is

Correct : C. 1950 litre

81. The permissible stress to which a structural member can be subjected to, is known as

Correct : B. working stress

82. Tacking rivets in tension members, are provided at a pitch in line not exceeding

Correct : D. 100 cm

83. In case of timber structures, the form factor for solid circular cross-section is taken as

Correct : A. 1.18

84. The distance between the outer faces of flanges of a plate girder, is known as

Correct : A. overall depth

85. When the depth of a plate girder is at least times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if is

Correct : D. 8

86. Which of the following conditions is to be satisfied both in elastic and plastic analysis?

Correct : A. equilibrium condition

87. If the pitch is 6 cm and rivet value is 4 tonnes, the number of rivets required for a riveted connection carrying an eccentric load of 15 tonnes at a distance of 30 cm from the centre line, is

Correct : B. 8

88. In a grillage footing, the maximum shear force occurs at the

Correct : B. centre of base plate

89. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is

Correct : B. 1.5 mm

90. Pick up the correct statement from the following:

Correct : D. all the above

91. The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to

Correct : D. 270 t

92. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is

Correct : A. 180

93. Pick up the incorrect statement from the following:

Correct : D. the diameter of a rivet hole is equal to the nominal diameter of the rivet plus 1.5 mm

94. Effective length of a column effectively held in position at both ends and restrained in direction at one end, is

Correct : C. 0.85 l

95. 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

Correct : C. 80

96. For a cantilever beam of length continuous at the support and unrestrained against torsion at the support and free at the end, the effective length is equal to

Correct : D. l = 3l

97. Hudson's formula gives the dead weight of a truss bridge as a function of

Correct : A. bottom chord area

98. The deflection of beams may be decreased by

Correct : A. increasing the depth of beam

99. The moment-curvature relation at a plastic hinge is

Correct : C. constant moment for all curvatures

100. If the depth of the section of an upper column is smaller than the lower column

Correct : D. none of these