13. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is a) 40% b) 50% c) 60% d) 70% Ans: c

Transcription

1 1. The heaviest I-section for same depth is a) ISMB b) ISLB c) ISHB d) ISWB 2. 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 Ans: b 3. 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 Ans: b 4. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate a) fully by direct bearing b) fully through fastenings c) 50% by direct bearing and 50% through fastenings d) 75% by direct bearing and 25% through fastenings 5. When the axis of load lies in the plane of rivet group, then the rivets are subjected to a) only shear stresses b) only tensile stresses c) both (a) and (b) d) none of the above Ans: a 6. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which 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 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. Ans: d Page 1 of 85

2 7. 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 8. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is a) 1.0 mm b) 1.5 mm c) 2.0 mm d) 2.5 mm Ans: b 9. As compared to field rivets, the shop rivets are a) stronger b) weaker c) equally strong d) any of the above Ans: a 10. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be a) 16 mm b) 20 mm c) 24 mm d) 27 mm 11. By providing sufficient edge distance, which of the following failures of riveted joint can be avoided? a) tension failure of the plate b) shear failure of the rivet c) shear failure of the plate d) crushing failure of the rivet 12. Minimum pitch of the rivets shall not be less than a) 1.5 d b) 2.0 d c) 2.5 d d) 3.0 d where d is gross diameter of rivet Page 2 of 85

3 13. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is a) 40% b) 50% c) 60% d) 70% 14. 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 fastenings whereas rivets are used as permanent fastenings. d) Riveting is less noisy than bolting. 15. Bolts are most suitable to carry a) shear b) bending c) axial tension d) shear and bending 16. Diameter of a bolt hole is usually taken as a) gross diameter of bolt b) nominal diameter mm c) nominal diameter mm d) nominal diameter of bolt Ans: b 17. 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 Ans: d 18. In the cross-section of a weld, throat is the a) minimum dimension b) average dimension c) maximum dimension d) none of the above Ans: a Page 3 of 85

4 19. 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 Ans: b 20. For a standard 45 fillet, the ratio of size of fillet to throat thickness is a) 1:1 b) 1 : V2 c) V2 : 1 d) 2: A butt weld is specified by a) effective throat thickness b) plate thickness c) size of weld d) penetration thickness Ans: a 22. 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 Ans: a 23. 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 161 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 Ans: a 24. 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 Page 4 of 85

5 25. The slenderness ratio of a column supported throughout its length by a masonry wall is a) zero b) 10 c) 100 d) infinity Ans: a 26. 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 Ans: b 27. 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 28. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is a) 180 b) 200 c) 250 d) 350 Ans: a 29. The maximum slenderness ratio of a steel column, the design of which is governed by wind or seismic forces is a) 150 b) 180 c) 250 d) 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 Ans: b Page 5 of 85

6 31. The best arrangement to provide unified behavior in built up steel columns is by a) lacing b) battening c) tie plates d) perforated cover plates Ans: a 32. If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be a) 40mm b) 60mm c) 80mm d) 100mm Ans: b 33. The use of tie plates in laced columns is a) prohibited b) not prohibited c) permitted at start and end of lacing system only d) permitted between two parts of the lacing 34. 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) Ans: b 35. 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) 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) Page 6 of 85

7 37. The effective length of a battened column is increased by a) 5% b) 10% c) 15% d) 20% Ans: b 38. The overlap of batten plates with the main members in welded connections should be more than a) 3t b) 4t c) 6t d) 8t where t = thickness of the batten plate Ans: b 39. The slenderness ratio of lacing bars should not exceed a) 100 b) 120 c) 145 d) Economical depth of a plate girder corresponds to a) minimum weight b) minimum depth c) maximum weight d) minimum thickness of web Ans: a 41. 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 Ans: a 42. 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 Ans: b Page 7 of 85

8 43. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is a) 5 mm b) 6 mm c) 8 mm d) 10mm Ans: b 44. The web crippling due to excessive bearing stress can be avoided by a) increasing the web thickness b) providing suitable stiffeners c) increasing the length of the bearing plates d) none of the above 45. As per IS : 800, for compression flange, the out stand of flange plates should not exceed a) 121 b) 161 c) 201 d) 251 where t = thickness of thinnest flange plate Ans: b 46. Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds a) 501 b) 851 c) 200t d) 2501 where t is thickness of web Ans: b 47. 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 Ans: b 48. 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 Page 8 of 85

9 49. Gantry girders are designed to resist a) lateral loads b) longitudinal loads and vertical loads c) lateral, longitudinal and vertical loads d) lateral and longitudinal loads 50. 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 Ans: b 51. 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) 52. 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 Ans: a 53. The maximum spacing of vertical stiffeners is a) 1.33d b) 1.25 d c) 1.5 d d) 1.75d where d is the distance between flange angles 54. The range of economical spacing of trusses varies from a) L/3 to L/5 b) L/4to2L/5 c) L/3 to L/2 d) 2L/5 to 3L/5 where L is span Ans: a Page 9 of 85

10 55. The maximum permissible span of asbestos cement sheets is a) 650 mm b) 810 mm c) 1250 mm d) 1680 mm Ans: d 56. Normally, the angle of roof truss with asbestos sheets should not be less than a) 26'/2 b) 30 c) 35 d) 40 Ans: b 57. To minimise the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be a) 1 b) 2 c) 3 d) 4 Ans: b 58. Generally the purlins are placed at the panel points so as to avoid a) axial force in rafter b) shear force in rafter c) deflection of rafter d) bending moment in rafter Ans: d 59. 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) ±0.2p c) ± 0.5 p d) ±0.7p where p is basic wind pressure Ans: b 60. The relation between intensity of wind pressure p and velocity of wind V is taken as a) pa V b) pav2 c) p a (1/V) d) pav"2 Ans: b Page 10 of 85

11 61. 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 Ans: a 62. The internal pressure coefficient on walls for buildings with large permeability is taken as a) ± 0.2 b) ±0.5 c) ± 0.7 d) The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of'h' is a) 10 m b) 20 m c) 25 m d) 50 m Ans: a 64. 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 65. The external wind pressure acting on a roof depends on a) degree of permeability of roof b) slope of roof c) both (a) and (b) d) none of the above Ans: b 66. 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 Ans: b Page 11 of 85

12 67. 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 68. The number of seismic zones in which the country has been divided are a) 3 b) 5 c) 6 d) 7 Ans: b 69. Minimum pitch provided in riveted steel tanks is a) 1.5 d b) 2.0 d c) 2.5 d d) 3.0 d where d is diameter of rivets Ans: d 70. The allowable tensile stress in structural mild steel plates for steel tank is assumed as a) 95.0 MPa on net area b) MPa on net area c) MPa on gross area d) MPa on gross area Ans: b 71. Steel tanks are mainly designed for a) weight of tank b) wind pressure c) water pressure d) earthquake forces 72. 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 Page 12 of 85

13 73. The capacity of the smallest pressed steel tank is a) 1000 litre b) 1650 litre c) 1950 litre d) 2450 litre 74. 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 Ans: b 75. The minimum thickness of plates in a steel stack should be a) 4mm b) 5 mm c) 6 mm d) 8 mm 76. Maximum pitch of rivets, used in steel stacks, is limited to a) 6t b) 101 c) 121 d) 161 where t is thickness of thinner plate being connected Ans: b 77. The diameter of base of conical flare of a steel stack is a) less than d b) equal to d c) more than d d) any of the above where d is the diameter of the cylindrical part 78. 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 Ans: a Page 13 of 85

14 79. If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as a) 0 b) 0.5 c) between 0.5 and 1.0 d) If the floor is supported at or near the bottom but top chords of a bridge are not braced, then the bridge is called a) deck type b) through type c) half through type d) double deck type 81. 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) 2.13m above the rail level 82. 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 Ans: a 83. 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 sideways buckling of top chord Ans: a Page 14 of 85

15 84. The sway bracing is designed to transfer a) 2Vi % of the top panel wind load to bottom bracing b) 10% of the top panel wind load to bottom bracing c) 25% of the top panel wind load to bottom bracing d) 50% of the top panel wind load to bottom bracing Ans: d 85. Study the following statements. i) Top lateral bracing prevents the sidesway buckling of the chord. ii) Sway bracing keeps the rectangular shape of the bridge cross-section. iii) Sway bracing transfers the load from top of end posts to bearings. The correct answer is a) only (i) b) both (i) and (ii) c) both (i) aad (iii) d) all (i), (ii) and (iii) Ans: b 86. The bracing provided in the plane of end posts is called a) sway bracing b) portal bracing c) top lateral bracing d) bottom lateral bracing Ans: b 87. 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 Ans: d 88. 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 89. In case of timber structures, the form factor for solid circular cross-section is taken as a) 1.18 b) c) 1.67 d) 1.81 Ans: a Page 15 of 85

16 90. 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 Ans: a 91. The elastic strain for steel is about a) 1/12 of strain at the initiation of strain hardening and about 1/120 of maxi-mum strain b) 1/2 of strain at the initiation of strain hardening and about 1/12 of maxi-mum 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 92. 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 Ans: b 93. The moment-curvature relation at a plastic hinge is a) linear b) parabolic c) constant moment for all curvatures d) constant curvature for all moments 94. Shape factor is a property which depends a) only on the ultimate stress of the material b) only on the yield stress of the material c) only on the geometry of the section d) both on the yield stress and ultimate stress of material 95. The statical method of plastic analysis satisfies a) equilibrium and mechanism conditions b) equilibrium and plastic moment conditions c) mechanism and plastic moment conditions d) equilibrium condition only Ans: b 96. The mechanism method of plastic analysis satisfies a) equilibrium and mechanism conditions b) equilibrium and plastic moment conditions c) mechanism and plastic moment conditions d) equilibrium condition only Ans: a Page 16 of 85

17 97. 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 98. 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 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 Ans: b 100. 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 Ans: a 101. In the virtual work method, the virtual quantity is a) displacement b) load c) slope d) moment Ans: a 102. 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 Ans: a Page 17 of 85

18 103. 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 Ans: d 104. In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be a) 0.55 Awfy b) 0.65 Awfy c) 0.75 Awfy d) 0.85 Awfy where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel Ans: a 105. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be: a) 4.5 mm b) 6 mm c) 8 mm d) 10 mm 106. The moment of inertia of the pair of vertical stiffeners about the center line of the web should not be less than. a) 1.5dV/C b) 1.5d /C c) 1.5d /C2 d) 1.5dY/C3 where, 't' is the minimum required thickness of the web and 'C is the maximum permitted clear distance between vertical stiffener for thickness 't' 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 h = the out stand of stiffener in mm Page 18 of 85

19 108. 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) unqual legged angles with long legs back to back c) unequal legged angles with short legs back to back d) both (b) or (c) Ans: b 109. Lug angles a) are used to reduce the length of connection. b) are unequal angles. c) increases shear lag. d) all the above Ans: a 110. For rivets in tension with counter-sunk heads, the tensile value shall be a) reduced by 25 % b) reduced by 33.3% c) increased by 25 % d) increased by 33.3 % Ans: b 111. 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 112. Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than a) 500 mm b) 600 mm c) 1000 mm d) 300 mm 113. In moment resistant connections, the moment resistance of riveted connection depends upon a) shear in rivets b) compression in rivets c) tension in rivets d) strength of rivets in bearing Page 19 of 85

20 114. The allowable shear stress in the web of mild steel beams decreases with a) decrease in h/t ratio b) increase in h/t ratio c) decrease in thickness d) increase in height where 'h' is height and t is thickness Ans: b 1. The effective length of a compression member of length L held in position and restrained in direction at one end and effectively restrained in direction but not held in position at the other end, is L 0.67 L 0.85 L 1.5 L E. 2 L 2. The ratio of shearing stress to shearing strain within elastic limit, is known as modulus of elasticity shear modulus of elasticity bulk modulus of elasticity tangent modulus of elasticity E. all the above. 3. For determination of allowable stress in axial compression, Indian Standard Institution has adopted Euler's formula Rankine formula Engesser formula Secant formula E. Perry Robertson formula. Page 20 of 85

21 4. The method of design of steel framework for greatest rigidity and economy in weight, is known as simply design semi-rigid design fully rigid design none of these. 5. 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 E In plastic analysis, the shape factor for circular sections, is none of these. 7. The critical stress on a column for elastic buckling given by Euler's formula, is Page 21 of 85

22 8. A beam is defined as a structural member subjected to axial loading transverse loading axial and transverse loading none of these. 9. According to IS : , the minimum thickness of a vertically stiffened web plate, shall not be less than E. none of these. 10. A fillet weld may be termed as mitre weld concave weld convex weld all the above. Page 22 of 85

23 11. If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is E. 12. The critical load for a column of length I hinged at both ends and having flexural rigidity El, is given by none of these 13. Slenderness ratio of a compression member is Page 23 of 85

24 E. 14. Pick up the correct statement from the following: Vertical stiffeners may be placed in pairs one on each side of the web Single vertical stiffeners may be placed alternately on opposite sides of the web Horizontal stiffeners may be placed in pairs one on each side of the web Horizontal stiffeners may be placed alternately on opposite sides of the web E. All the above. 15. A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as column stanchion post strut E. all the above. 16. The equivalent axial tensile load P e, which produces an average axial tensile stress in the section equivalent to the combined stress due to axial tension P and bending M, at the extreme fibre of the section, is given by (where Z is the section modulus of the section). Page 24 of 85

25 17. Live load varies in magnitude varies in position is expressed as uniformly distributed load All the above. 18. The most economical section for a column, is rectangular solid round flat strip tubular section E. hexagonal. 19. If the depth of two column sections are equal, then the column splice is provided with filler plates with bearing plates with filler and hearing plates none of these. The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as overall depth clear depth effective depth none of these. Page 25 of 85

26 21. Web crippling generally occurs at the point where bending moment is maximum shearing force is minimum concentrated loads act deflection is maximum E. all the above. 22. Pick up the incorrect statement from the following: The nominal diameter of a rivet is its diameter before driving The gross diameter of a rivet is the diameter of rivet hole The gross area of a rivet is the cross-sectional area of the rivet hole The diameter of a rivet hole is equal to the nominal diameter of the rivet plus 1.5 mm E. None of these. 23. The allowable stress in axial tension for rolled I-sections and channels, is taken as 1420 kg/cm kg/cm kg/cm kg/cm When a tension member is made of four angles with a plate as a web, the allowance for holes is made as two holes for each angle and one hole for the web one hole for each angle and one hole for the web one hole for each angle and two holes for the web two holes for each angle and two holes for the web E. none of these. Page 26 of 85

27 25. The failure of a web plate takes place by yielding if the ratio of the clear depth to thickness of the web, is less than E 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). 2 t 4 t 6 t 8 t E. 10 t 27. Pick up the correct statement from the following: Dead load includes self-weight of the structure and super-imposed loads permanently attached to the structure Dead loads change their positions and vary in magnitude Dead loads are known in the beginning of the design None of these. 28. The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is E. 350 Page 27 of 85

28 29. If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than d 1.25 d 1.5 d 1.75 d 30. If the unsupported length of a stanchion is 4 metres and least radius of gyration of its crosssection is 5, the slenderness ratio of the stanchion, is E The area A p of cover plates in one flange of a built up beam, is given by E. none of these. 32. The average shear stress for rolled steel beam section, is 845 kg/cm kg/cm kg/cm kg/cm 2 E kg/cm 2 Page 28 of 85

29 33. For a rectangular section, the ratio of the maximum and average shear stresses, is E To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to, the ratio of the moment M to the axial load P should be E. 35. The cross-section of a standard fillet is a triangle whose base angles are 45 and and and and Secant formula for direct stress in compression, is applicable only for slenderness ratio upto E. 160 Page 29 of 85

30 37. A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than d/250 for structural steel d/225 for high tensile steel both (c) and (b) neither (a) nor (b) 38. The rolled steel I-sections are most commonly used as beams because these provide large moment of inertia with less cross-sectional area large moment of resistance as compared to other section greater lateral stability all the above. 39. The thickness t of a single flat lacing should not be less than 1/30 th length between inner end rivets 1/40 th length between inner end rivets 1/50 th length between inner end rivets 1/60 th length between inner end rivets E. none of these. 40. For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (excepting the webs of Indian Standard rolled steel joists and channels). 4 mm 6 mm 8 mm 10 mm Page 30 of 85

31 41. The permissible stress in bending for rolled steel I-beams and channels, is 1500 kg/cm kg/cm kg/cm kg/cm 2 E kg/cm Column footing is provided to spread the column load over a larger area to ensure that intensity of bearing pressure between the column footing and soil does not exceed permissible bearing capacity of the soil to distribute the column load over soil through the column footing all the above. 43. Pick up the correct statement from the following: When the gauge distance is larger than the pitch, the failure of the section may occur in a zig-zag line 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 When the gauge distance and pitch are both equal, the failure to the section becomes more likely as the diameter of the holes increases All the above. 44. The ratio of longitudinal stress to strain within eiastic limit, is known as modulus of elasticity shear modulus of elasticity bulk modulus of elasticity tangent modulus of elasticity E. all the above. Page 31 of 85

32 45. If flexural rigidity of a column whose length is L and the loaded end is free, is El, the critical load will be E. 46. For a column of height L fixed in position and direction both at its top and bottom, its effective length, is L L L 2L 47. In a tension member if b is width of plate, t is thickness of plate, p is staggered pitch, g is gauge distance, n is number of rivet holes in zig-zag line, n is number of gauge spaces, d is gross diameter of rivets, then the net sectional area A net of the plate, is Page 32 of 85

33 E. none of these. 48. Net sectional area of a tension member, is equal to its gross section area plus the area of the rivet holes divided by the area of rivet holes multiplied by the area of the rivet holes minus the area of the rivet holes E. none of these. 49. 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 pitch of rivet gauge distance of rivet staggered pitch all the above E. none of these. 50. Tongue plates are provided in a steel girder at the upper flange the lower flange the upper end of the web the lower end of the web E. the upper and lower ends of the web. 51. Diameter of a rivet hole is made larger than the diameter of the rivet by 1.0 mm for rivet diameter upto 12 mm 1.5 mm for rivet diameter exceeding 25 mm Page 33 of 85

34 2.0 mm for rivet diameter over 25 mm none of these. 52. Number of rivets required in a joint, is E. none of these. 53. When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from each web each flange both webs each web or one hole from each flange whichever is more E. each web or one hole from each flange whichever is less. 54. 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 0.15 d 0.22 d 0.33 d 0.44 d Page 34 of 85

35 55. A column splice is used to increase length of the column strength of the column cross-sectional area of the column none of these. 56. 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 E. 57. If d is the clear depth of a plate girder, t is the minimum required thickness of the web, C is the maximum clear distance between vertical stiffeners, the moment of inertia of a pair of stiffeners about the centre line of the web, is Page 35 of 85

36 58. The ratio of the span L of the filler joists to the depth d from the underside of the joint to the top of the structural concrete, should not exceed E The maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is 1500 kg/cm kg/cm kg/cm kg/cm Perforated cover plates are particularly suitable for built up sections consisting of channels placed back to back channels placed toe to toe four angle box section all the above. 61. The tensile strength of mild steel for bolts and nuts should not be less than 32 kg/mm 2 36 kg/mm 2 40 kg/mm 2 44 kg/mm A riveted joint may experience shear failure shear failure of plates Page 36 of 85

37 bearing failure bearing failure of rivets E. all the above. 63. With a percentage increase of carbon in steel, decreases its strength hardness brittleness ductility. 64. In a built up beam actual bending compressive stress fbc is given by (when y 1 is the distance of the edge of the beam from the neutral axis). E. 15. In double lacing, the thickness t of flat lacing is t < 1/40 th length between inner end rivets t < 1/50 th length between inner end rivets t < 1/60 th length between inner end rivets t < 1/70 th length between inner end rivets E. none of these. Page 37 of 85

38 16. When the length of a tension member is too long a wire rope is used a rod is used a bar is used a single angle is used. 17.An imaginary line along which rivets are placed, is known as rivet line scrieve line back line gauge line E. all the above. 18. The allowable stress in axial tension is generally kept less if thickness of the member is more than 10 mm 12 mm 15 mm 20 mm E. 22 mm 19. The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is E. 350 Page 38 of 85

39 20. The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm 2, is 16 kg/cm 2 18 kg/cm 2 20 kg/cm 2 22 kg/cm Lug angle is used with single angle member not used with double angle member used with channel member all the above. 22. Effective length of a column effectively held in position and restrained in direction at both ends, is L 0.67 L 0.85 L 1.5 L E. 2 L 23. A riveted joint many experience tearing failure of plates bearing failure of plates splitting failure of plates at the edges bearing failure of rivets E. all the above. Page 39 of 85

40 24. 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 E. none of these. 25. IS : recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every 1.00 mm thickness of packing 1.50 mm thickness of packing 2.0 mm thickness of packing 2.50 mm thickness of packing E. 3.0 mm thickness of packing. 26. 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 Page 40 of 85

41 E. 27. When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption bearing plate is assumed as a short beam to transmit the axial load to the lower column section axial load is assumed to be taken by flanges load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple all the above. 28. For a steel member of slenderness ratio 350, the allowable stress is 76 kg/cm 2 if it is HTW grade of thickness exceeding 32 mm HT grade of thickness exceeding 45 mm HT grade of thickness not exceeding 45 mm All the above. 29. The permissible stress to which a structural member can be subjected to, is known as bearing stress working stress tensile stress compressive stress E. all the above. Page 41 of 85

42 30. If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is E. 31. Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or 16 times the thickness of outside plate 24 times the thickness of outside plate 32 times the thickness of outside plate 36 times the thickness of outside plate. 32. 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 L 0.67 L 0.85 L 1.5 L E. 2 L Page 42 of 85

43 33. For columns whose slenderness ratio is upto 160, the secant formula for the determination of allowable stress, is 34. 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 0.5 L 0.67 L 0.85 L L E. 2 L Page 43 of 85

44 35. According to the Unwin's formula, if t is thickness of the plate in mm, the nominal diameter of the rivet, is d = 1.91 t d = 1.91 t 2 d = 1.91 t d = 1.91 t E. d = 2.3 t 36. A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, is E. none of these. 37. The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is Page 44 of 85

45 38. 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 39. On eccentrically loaded columns, the equivalent axial load may be obtained by adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor dividing the sum of axial load and eccentric load by the product of the bending moment and appropirate bending factor none of these. 40. The distance between the outer faces of flanges of a plate girder, is known as overall depth clear depth effective depth none of these. Page 45 of 85

46 41. To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is 10% 13% 15% 18% E. 20%. 42. 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 unstiffened seated connection stiffened seated connection seated connection none of these. 43. Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to 50% 60% 70% 80% E. 40% 44. Bulb angles are used in column building bridge building ship building water tank building. Page 46 of 85

47 45. Effective sectional area of a compression member is : gross sectional area - area of rivet hole gross sectional ares + area of rivet hole gross sectional ares x area of rivet hole gross sectional ares + area of rivet hole. 46. A fillet weld whose axis is parallel to the direction of the applied load, is known as diagonal filler weld end fillet weld side fillet weld all the above. 47. Assuming the values of maximum deviation ΔP and ΔE to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is E. none of these. 48. 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 overall depth clear depth effective depth none of these. Page 47 of 85

48 49. Rolled steel angle sections are classified as equal angles unequal angles bulb angles all the above. 50. Factor of safety is the ratio of yield stress to working stress tensile stress to working stress compressive stress to working stress bearing stress to working stress E. bearing stress to yield stress. 1. 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 L = span L = 0.85 span L = 0.75 span L = 0.7 span E. L = 1.25 span 2. Rolled steel beams are designated by Indian Standard series and its weight per metre and depth of its section depth of section and weight per metre width of flange and weight per metre weight per metre and flange width. Page 48 of 85

49 3. The spans are considered approximately equal if the longest span does not exceed the shortest span by more than 5% 10% 15% 20% 4. If the depth of the section of an upper column is smaller than the lower column filler plates are provided with column splice bearing plates are provided with column splice neither filler plates nor bearing plates are provided with column splice filler plates and bearing plates are provided with column splice E. none of these. 5. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed E 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/cm 2 and allowable bending stress in slab base is 1890 kg/cm 2, the thickness (t) of the slab base, is Page 49 of 85

50 7. If P is the load applied to a bracket with an eccentricity e, the resisting moment F exerted by a rivet at a distance r n from the centre of gravity, is E. 8. The effective length of a weld, is taken as the actual length minus the size of weld minus twice the size of weld plus the size of weld plus twice the size of weld E. none of these. 9. The permissible bearing stress in steel, is 1500 kg/cm kg/cm kg/cm kg/cm 2 E kg/cm 2 Page 50 of 85

51 10. The main assumption of the method of simple design of steel frame work, is : beams are simply supported all connections of beams, girders and trusses are virtually flexible members in compression are subjected to forces applied at appropriate eccentricities all the above. 11. Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is E In a fillet weld placed on the sides of the base, the metal experiences shear tension compression bending E. all the above. 13. The bending moment for filler joists at the middle of at intermediate span, is E. Page 51 of 85

52 14. The maximum length of 6 mm fillet weld required to connect a tie bar 80 mm x 8 mm with a gusset plate 8 mm thick, assuming permissible stress in tension as 1500 kg/cm 2, is cm cm cm cm 15. The Indian standard code which deals with steel structures, is IS : 875 IS : 800 IS : 456 IS : When two plates are placed end to end and are joined by two cover plates, the joint is known as lap joint butt joint chain riveted lap joint zig-zag riveted lap joint E. double cover butt joint. 17. The moment of the couple set up in a section of a beam by the logitudinal compressive and tensile force, is known as bending moment moment of resistance flexural stress moment none of these. Page 52 of 85

53 18. Pick up the correct statement from the following: The minimum pitch should not be less than 2.5 times the gross diameter of the river The minimum pitch should not be less than 12 times the gross diameter of the rivet The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression All the above. 19. In a member subjected to an axial tensile force and bending moment, the maximum allowable stress in axial tension is f t and the maximum allowable bending stress in tension is f ht. If f t and f ht are their corresponding actual axial tensile and bending stresses, the relationship which holds goods is 20. A major beam in a building structure, is known as a girder a floor beam a main beam all the above. Page 53 of 85

54 21. Rolled steel Tee-sections are used as columns with flat strips to connect plates in steel rectangular tanks as built up sections to resist axial tension none of these. 22. A compression member consisting of angle sections may be a continuous member discontinuous single angle strut discontinuous double angle strut all the above. 23. The equivalent axial load is obtained from the fomula E. none of these. Page 54 of 85

55 24. According to IS : the permissible bending stress in steel slab plates, is 1500 kg/cm kg/cm kg/cm kg/cm A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is < 19 < 24 > 19 > 24 E. > 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 the section the section plus area of rivet holes the section minus area of rivet holes tthe section multiplied by the area of the rivet hole. 27. When a load is transferred through one surface to another surface in contact, the stress is known as tensile stress compressive stress shearing stress working stress E. none of these. Page 55 of 85

56 28. The most commonly used sections in lateral system to carry shear force in built up columns, are rolled steel flats rolled angles rolled channels all the above. 29. If p and d are pitch and gross diameter of rivets, the efficiency (η) of the riveted joint, is given by E. 30. For steel members not exposed to weather, the thickness of steel should not be less than 4.5 mm 6 mm 8 mm 10 mm Page 56 of 85

57 31. The minimum pitch of rivet holes of diameter d should not be less than d 1.25 d 1.5 d 2 d E. 2.5 d 32. A long plate girder is subjected to a maximum bending moment M in which permitted allowable bending stress is f b. The economical depth d e and the thickness of the web t w, is given by E. none of these. 33. The beams supporting the steps of a stair are generally known as headers trimmers stringers spandrel beams. Page 57 of 85

58 34. In a grillage column footing maximum bending moment M occurs at the centre of grillage beams. Its value is (where P, L and a are axial load, length of the beam and length of the column base respectively). M = P(L - a) E. 35. For a steel grillage footing to support two unequal column loads line of action of the resultant of two column loads, is made to coincide with the centre of gravity of the base of the footing trapezoidal shape is used for the base footing projections of beams on either side in lower tier are such that bending moments under columns are equal bending moment under the columns are kept equal to the bending moment between to two columns E. all the above. 36. In case of cantilever fillers, the ratio of the span L to depth d, should not exceed E. 20 Page 58 of 85

59 37. The rivets which are heated and then driven in the field, are known power driven shop rivets power driven field rivets hand driven rivets cold driven rivets E. field rivets. 38. The strength of a riveted lap joint is equal to its shearing strength bearing strength tearing strength least of (a), (b) and (c) E. greatest of (a) (b) and (c). 39. The slenderness ratio of a column is zero when its length is zero is equal to its radius of gyration is supported on all sides throughout its length is between the points of zero moments. 40. 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 Page 59 of 85

60 E. 41. The main advantage of a steel member, is : its high strength its gas and water tightness its long service life all the above. 42. A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm 2 produces a strain of cm. If Young's modulus of steel is 2.1 x 10 6 kg/cm 2, the bar is in the elastic range in the plastic range at yield point none of these. 43. Poisson's ratio for steel within elastic limit, ranges from 0.15 to to to to 0.35 E to 0.50 Page 60 of 85

61 44. For eccentrically loaded columns, the bending factor is 45. When a large value of radius of gyration is not required channels are placed back to back channel flanges are kept inward channel flanges are kept outward none of these. 46. The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called crippling load buckling load critical load all the above. 47. If the slenderness ratio is greater than 160, the allowable stress in axial compression is multiplied by a factor (1.2 - (l/xy) where x is E Page 61 of 85

62 48. The effective length of a compression member of length L, held in position and restrained in direction at both ends, is L 0.67 L 0.85 L 1.5 L E. 2 L 49. Spans of continuous fillers are considered approximately equal if the longest span does not exceed the shortest span by more than 5% 10% 15% 20% E. 25% 50. The gross diameter of a rivet is the diameter of cold rivet before driving rivet after driving rivet hole none of these. 1. Cold driven rivets range from 6 to 10 mm in diameter 10 to 16 mm in diameter 12 to 22 mm in diameter 22 to 32 mm in diameter E. none of these. Page 62 of 85

63 2. The main type of butt joints, is a double cover shear riveted joint chain riveted joint zig-zag riveted joint all the above. 3. Outstanding length of a compression member consisting of a channel, is measured as half of the nominal width nominal width of the section from the edge to the first row of rivets none of these. 4. The equivalent axial load may be defined as the load which produces a stress equal to maximum stress produced by the eccentric load maximum stressed fibre bending stress none of these. 5. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than d but not less than 0.20 d 1.25 d but not less than 0.33 d 1.5 d but not less than 0.33 d 2.0 d but not less than 0.50 d E. 2.5 d but not less than 0.50 d Page 63 of 85