FAQ’s for Structural Design Jobs

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1. 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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2. Lug angles

1. are used to reduce the length of connection.

2. are unequal angles.

3. increases shear lag.

4. all the above

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3. In the virtual work method, the virtual quantity is

1. displacement

2. load

3. slope

4. moment

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

1. equilibrium condition

2. yield condition

3. plastic moment condition

4. mechanism condition

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5. The mechanism method of plastic analysis satisfies

1. equilibrium and mechanism conditions

2. equilibrium and plastic moment conditions

3. mechanism and plastic moment conditions

4. equilibrium condition only

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6. 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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7. In case of timber structures, the simple bending formula M = fz may be applied for

1. rectangular beams up to 300 mm depth

2. all rectangular beams

3. solid circular beams only

4. all square cross-section beams

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8. 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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9. 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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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 capacity of the smallest pressed steel tank is

1. 1000 liters

2. 1650 liters

3. 1950 liters

4. 2450 liters

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12. Steel tanks are mainly designed for

1. weight of tank

2. wind pressure

3. water pressure

4. earthquake forces

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13. 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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14. The external wind pressure acting on a roof depends on

1. degree of permeability of roof

2. slope of roof

3. both a and b

4. none of the above

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15. The maximum spacing of vertical stiffeners is(where d is the distance between flange angles)

1. 1.33 d

2. 1.25 d

3. 1.5 d

4. 1.75 d

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16. 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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17. Gantry girders are designed to resist

1. lateral loads

2. longitudinal loads and vertical loads

3. lateral, longitudinal and vertical loads

4. lateral and longitudinal loads

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18. Economical depth of a plate girder corresponds to

1. minimum weight

2. minimum depth

3. maximum weight

4. minimum thickness of web

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19. 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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20. 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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21. 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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22. According to IS Specifications, the maximum pitch of rivets in compression is (where t is thickness of thinnest outside plate or angle)

1. lesser of 200 mm and 12 t

2. lesser of 200 mm and 161

3. lesser of 300 mm and 32 t

4. lesser of 3 00 mm and 24 t

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23. 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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24. The effective length of a fillet weld should not be less than

1. two times the weld size

2. four times the weld size

3. six times the weld size

4. weld size

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25. 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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26. Bolts are most suitable to carry

1. shear

2. bending

3. axial tension

4. shear and bending

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27. Efficiency of a riveted joint, having the minimum pitch as per IS: 800, is

1. 0.4

2. 0.5

3. 0.6

4. 0.7

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28. The difference between gross diameter and nominaldia meter 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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29. Bending compressive and tensile stresses respectively are calculated based on

1. net area and gross area

2. gross area and net area

3. net area in both cases

4. gross area in both cases

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30. 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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31. 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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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. 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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34. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

1. Square

2. Rectangular

3. Triangular

4. Trapezoidal

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35. The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is

1. 35

2. 25

3. 30

4. 20

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36. In the displacement method of structural analysis, the basic unknowns are

1. Displacements

2. Force

3. Displacements and forces

4. None of the above

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37. When a uniformly distributed load, longer than the span of the girder, moves from left to right, then the maximum bending moment at mid section of span occurs when the uniformly distributed load occupies

1. Less than the left half span

2. whole of left half span

3. More than the left half span

4. Whole span

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38. 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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39. 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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40. Bending moment at any section in a conjugate beam gives in the actual beam

1. Slope

2. Curvature

3. Deflection

4. Bending moment

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41. While using three moments equation, a fixed end of a continuous beam is replaced by an additional span of

1. Zero length

2. Infinite length

3. Zero moment of inertia

4. None of the above

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42. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of ? (Where xu is the depth of natural axis at the limit state of collapse)

1. 0.367 xu

2. 0.416 xu

3. 0.446 xu

4. 0.573 xu

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43. 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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44. The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is?

1. WL2/2EI

2. wL2/3EI

3. wL3/2EI

4. wL3/3EI

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45. 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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46. A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be?

1. 3-Feb

2. 2-Mar

3. 8-May

4. 5-Aug

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47. 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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48. The maximum spacing of vertical stiffeners is (where d is the distance between flange angles)

1. 1.33 d

2. 1.25 d

3. 1.5 d

4. 1.75 d

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

1. shear buckling of web plate

2. compression buckling of web plate

3. yielding

4. all of the above

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50. 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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