FAQ’s for Structural Design Jobs

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1. 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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2. For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?

1. equal angles back-to-back

2. unequal legged angles with long legs back-to-back

3. unequal legged angles with short legs back-to-back

4. both b or c

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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. Load factor is

1. always equal to factor of safety

2. always less than factor of safety

3. always greater than factor of safety

4. sometimes greater than factor of safety

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5. 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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6. 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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7. The diameter of base of conical flare of a steel stack is (where d is the diameter of the cylindrical part)

1. less than d

2. equal to d

3. more than d

4. all of the above

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

1. 4 zones

2. 5 zones

3. 6 zones

4. 7 zones

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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. The risk coefficient k, depends on

1. mean probable design life of structures

2. basic wind speed

3. both a and b

4. none of the above

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12. 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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13. 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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14. Shear buckling of web in a plate girder is prevented by using

1. vertical intermediate stiffener

2. horizontal stiffener at neutral axis

3. bearing stiffener

4. none of the above

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15. The effective length of a battened column is increased by

1. 0.05

2. 0.1

3. 0.15

4. 0.2

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16. Lacing bars in a steel column should be designed to resist

1. bending moment due to 2.5% of the column load

2. shear force due to 2.5% of the column load

3. 2.5% of the column load

4. both a and b

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

1. 1.8 L

2. L

3. 1.1 L

4. 1.5 L

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18. The slenderness ratio of a column supported throughout its length by a masonry wall is

1. zero

2. 10

3. 100

4. infinity

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19. The actual thickness of butt weld as compared to the thickness of plate is usually

1. more

2. less

3. equal

4. none of the above

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20. Diameter of a bolt hole is usually taken as

1. gross diameter of bolt

2. nominal diameter + 1.5 mm

3. nominal diameter + 2.0 mm

4. nominal diameter of bolt

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21. Select the correct statement

1. Material cost of a rivet is higher than that of a bolt.

2. Tensile strength of a bolt is lesser than that of a rivet.

3. Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings.

4. Riveting is less noisy than bolting.

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22. As compared to field rivets, the shop rivets are

1. stronger

2. weaker

3. equally strong

4. any of the above

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23. If the thickness of plate to be connected by a rivet is 16mm, then suitable size of rivet as per Unwin’s formula will be

1. 16 mm

2. 20 mm

3. 24 mm

4. 27 mm

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

1. only shear stresses

2. only tensile stresses

3. both (a)and (b)

4. none of the above

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25. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which

1. is at the maximum distance from CG of the rivet group

2. is at the minimum distance from CG of the rivet group

3. gives the maximum angle between the two forces Fa and Fm

4. gives the minimum angle between the two forces Fa and Fm

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

1. lap joint

2. butt joint with single cover plate

3. butt joint with double cover plates

4. none of the above

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27. 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

1. fully by direct bearing

2. fully through fastenings

3. 50% by direct bearing and 50% through fastenings

4. 75% by direct bearing and 25% through fastenings

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28. 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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29. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to

1. 10

2. 15

3. 20

4. 25

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30. At-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis

1. Remains within the flange

2. Remains below the slab

3. Coincides the geometrical centre of the beam

4. None of these

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31. By over-reinforcing a beam, the moment of resistance can be increased not more than

1. 0.1

2. 0.15

3. 0.2

4. 0.25

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32. If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept

1. 4.5 m

2. 4.0 m

3. 3.5 m

4. 3.0 m

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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. The minimum thickness of s flat slab is taken

1. L/32 for end panels without drops

2. L/36 for end panels without drops

3. L/36 for interior panels without drops

4. All the above

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35. The width of the flange of a L-beam, should be less than

1. One-sixth of the effective span

2. Breadth of the rib + four times thickness of the slab

3. Breadth of the rib + half clear distance between ribs

4. Least of the above

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36. Which of the following is not the displacement method?

1. Equilibrium method

2. Column analogy method

3. Moment distribution method

4. Kani’s method

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37. When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

1. The head of the load reaches the section

2. The tail of the load reaches the section

3. The load position should be such that the section divides it equally on both sides

4. The load position should be such that the section divides the load in the same ratio as it divides the span

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38. A single rolling load of 8 kN rolls alone a girder of 15 m span. the absolute maximum bending moment will be

1. 8 kN.m

2. 15 kN.m

3. 30 kN.m

4. 60 kN.m

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39. In the slope deflection equations, the deformations are considered to be caused by

1. Bending moment

2. Shear force

3. Axial force

4. Both b & c

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40. According to IS codes recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

1. 0.43 d

2. 0.55 d

3. 0.68 d

4. 0.85 d

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41. If the size of panel in a flat slab is 6m x 6m, then as per Indian standard code, the widths of column strip and middle strip are

1. 3.0 m and 1.5 m

2. 1.5 m and 3.0 m

3. 3.0 m and 3.0 m

4. 1.5 m and 1.5 m

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42. A truss containing j joints and m members, will be a simple truss if?

1. m = 2j – 3

2. j = 2m – 3

3. m = 3j – 2

4. j = 3m – 2

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43. The maximum deflection due to a uniformly distributed load w/unit length over entire span of a cantilever of length l and of flexural rigidly EI, is?

1. wl3/3EI

2. w14/3EI

3. w14/8EI

4. w14/12EI

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44. A simply supported beam carries varying load from zero at one end and W at the other end. If the length of the beam is a, the maximum bending moment will be?

1. wa/27

2. wa2/27

3. w2a

4. wa2

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45. A cantilever of length is subjected to a bending moment at its free end If EI is the rigidity of the section, the deflection of the free end, is?

1. ML/EI

2. ML/2EI

3. ML2/2EI

4. ML2/3EI

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46. 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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47. 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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48. 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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49. The range of economical spacing of trusses varies from

1. L/3 to L/5

2. L/4to2L/5

3. L/3 to L/2

4. 2L/5 to 3L/5 where L is span

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50. As per IS: 800, for compression flange, the out stand of flange plates should not exceed (where t = thickness of thinnest flange plate)

1. 121

2. 161

3. 201

4. 251

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