FAQ’s for Structural Design Jobs

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1. Pitch of tacking rivets, when double angles connected back-to-back and acting as tension members should not be more than

1. 500 mm

2. 600 mm

3. 1000 mm

4. 300 mm

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2. For rivets in tension with counter-sunk heads, the tensile value shall be

1. reduced by 25 %

2. reduced by 33.3%

3. increased by 25 %

4. increased by 33.3 %

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

1. 1.5

2. 1.7

3. 2

4. 2.34

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4. compression force in two end posts The pin of a rocker bearing in a bridge is designed for

1. bearing and shear

2. bending and shear

3. bearing and bending

4. bearing, shear and bending

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5. The bracing provided in the plane of end posts is called

1. sway bracing

2. portal bracing

3. top lateral bracing

4. bottom lateral bracing

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6. The portal bracing in a truss bridge is used to

1. transfer load from top of end posts to bearings

2. keep the rectangular shape of the bridge cross-section

3. stiffen the structure laterally

4. prevent the sidesway buckling of top chord

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7. The effect of racking forces is considered in the design of i) lateral braces, ii) chord members. The correct answer is

1. only (i)

2. only (ii)

3. both (i) and (ii)

4. none of the above

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8. Hudson’s formula gives the dead weight of a truss bridge as a function of

1. bottom chord area

2. top chord area

3. effective span of bridge

4. heaviest axle load of engine

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9. Which of the following sections should preferably be used at places where torsion occurs?

1. angle section

2. channel section

3. box type section

4. any of the above

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

1. 150.0 MPa on gross area

2. 95.0 MPa on net area

3. 105.5 MPa on net area

4. 105.5 MPa on gross area

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11. Steel tanks are mainly designed for

1. weight of tank

2. wind pressure

3. water pressure

4. earthquake forces

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12. Minimum pitch provided in riveted steel tanks is (where d is diameter of rivets)

1. 1.5 d

2. 2.0 d

3. 2.5 d

4. 3.0 d

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13. Bearing stiffener in a plate girder is used to

1. transfer the load from the top flange to the bottom one

2. prevent buckling of web

3. decrease the effective depth of web

4. prevent excessive deflection

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14. The forces acting on the web splice of a plate girder are

1. axial forces

2. shear and axial forces

3. shear and bending forces

4. axial and bending forces

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15. The web crippling due to excessive bearing stress can be avoided by

1. increasing the web thickness

2. providing suitable stiffeners

3. increasing the length of the bearing plates

4. none of the above

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

1. 5 mm

2. 6 mm

3. 8 mm

4. 10 mm

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17. The overlap of batten plates with the main members in welded connections should be more than (where t = thickness of the batten plate)

1. 3t

2. 4t

3. 6t

4. 8t

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18. The use of tie plates in laced columns is

1. prohibited

2. not prohibited

3. permitted at start and end of lacing system only

4. permitted between two parts of the lacing

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19. 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

1. 0.67 L

2. 0.8 L

3. L

4. 1.5 L

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

1. minimum dimension

2. average dimension

3. maximum dimension

4. none of the above

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21. Bolts are most suitable to carry

1. shear

2. bending

3. axial tension

4. shear and bending

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

1. 120 mm

2. 160 mm

3. 200 mm

4. 300 mm

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23. The heaviest I-section for same depth is

1. ISMB

2. ISLB

3. ISHB

4. ISWB

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24. The minimum number of main steel bars provided in R.C.C.

1. All the above

2. Rectangular columns are 4

3. Circular columns are 6

4. Octagonal columns are 8

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25. The width of the flange of a T-beam should be less than

1. One-third of the effective span of the T-beam

2. Distance between the centres of T-beam

3. Breadth of the rib plus twelve times the thickness of the slab

4. Least of the above

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26. An under-reinforced section means

1. Steel is provided at the underside only

2. Steel provided is insufficient

3. Steel provided on one face only

4. Steel will yield first

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27. The width of the rib of a T-beam , is generally kept between

1. 1/7 to 1/3 of rib depth

2. 1/3 to 1/2 of rib depth

3. 1/2 to 3/4 of rib depth

4. 1/3 to 2/3 of rib depth

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28. For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed

1. 10

2. 15

3. 20

4. 25

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29. Enlarged head of a supporting column of a flat slab is technically known as

1. Supporting end of the column

2. Top of the column

3. Capital

4. Drop panel

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30. On a circular slab of radius, the maximum radial moment at the center if the load on the slab in wkn/m2

1. WR2/16

2. 2WR2/16

3. 3WR2/16

4. 5WR2/16

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31. The spacing of the main bars in a simply supported slab, should not exceed its effective depth by

1. Three times

2. Four times

3. Five times

4. Six times

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32. In a simply supported slab, alternate bars are curtailed at

1. 1/4th of the span

2. 1/5th of the span

3. 1/6th of the span

4. 1/7th of the span

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33. The nutral axis of a T-beam exists

1. Within the flange

2. At the bottom edge of the slab

3. Below the slab

4. All the above

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34. In a pre-stressed member, it is advisable to use

1. Low strength concrete only

2. High strength concrete only

3. Low strength concrete but high tensile steel

4. High strength concrete and high tensile steel

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35. Which of the following methods of structural analysis is a displacement method?

1. Moment distribution method

2. Column analogy method

3. Three moment equation

4. None of the above

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36. The maximum bending moment due to a train of wheel loads on a simply supported girder

1. Always occurs at center of span

2. Always occurs under a wheel load

3. Never occurs under a wheel load

4. None of the above

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37. For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust

1. Is increased

2. Is decreased

3. Remains unchanged

4. Becomes zero

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38. The carryover factor in a prismatic member whose far end is fixed is

1. 2-Jan

2. 4-Mar

3. 1

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39. When shear stress exceeds the permissible limit in a slab, then it is reduced by

1. Increasing the depth

2. Providing shear reinforcement

3. Using high strength steel

4. Using thinner bars but more in number

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40. A steel rod 1 meter long having square cross section is pulled under a tensile load of 8 tones the extension in the rod was 1 mm only. if E steel=2x106kg/cm2, the side of the rod, is

1. 1 cm

2. 1.5 cm

3. 2 cm

4. 2.5 cm

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41. If a concrete column 200×200 mm in cross-section is reinforced with four steel bars of 1200 mm2 total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm2 and Es is 15Ec?

1. 264 MN

2. 274 MN

3. 284 MN

4. 294 MN

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42. A rod of uniform cross-section A and length L force P. The young’s modules E of the material, is?

1. E=/A. L

2. E=/P. L

3. E=/P. L/A

4. E=/P. A

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43. Shell structure does not have any?

1. Bending moment

2. Shear stress

3. Tensile stress

4. Compressive stress

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44. In frame structure, what transfers the load to columns?

1. Foundation

2. Beams

3. Slabs

4. Roofs

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45. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is?

1. 4.5 m

2. 5 m

3. 3.5 m

4. 4 m

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46. One of the criteria for the effective width of flange of T-beam is bf =-+bw+6Df6 in above formula, lo signifies?

1. Effective span of T-beam

2. Distance between points of zero moments in the beam

3. Distance between points of maximum moments in the beam

4. Clear span of the T-beam

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47. Generally, the purlins are placed at the panel points so as to avoid

1. axial force in rafter

2. shear force in rafter

3. deflection of rafter

4. bending moment in rafter

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48. The relation between intensity of wind pressure p and velocity of wind V is taken as

1. pa V

2. paV2

3. p a (1/V)

4. paV”2

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49. The maximum permissible span of asbestos cement sheets is

1. 650 mm

2. 810 mm

3. 1250 mm

4. 1680 mm

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

1. 1.0 mm

2. 1.5 mm

3. 2.0 mm

4. 2.5 mm

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