FAQ’s for Structural Design Jobs

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1. The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)

1. decrease in h/t ratio

2. increase in h/t ratio

3. decrease in thickness

4. increase in height

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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. 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 (where, t = the web thickness in mm, h = the outstand of stiffener in mm)

1. 75 t2/h

2. 125 t3/h2

3. 125 t2/h

4. 175 t2/h

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

1. 4.5 mm

2. 6 mm

3. 8 mm

4. 10 mm

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5. 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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6. 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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7. The ratio of plastic section modulus to elastic section modulus

1. is equal to 1

2. is always less than 1

3. is always greater than 1

4. can be less than 1

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

1. linear

2. parabolic

3. constant moment for all curvatures

4. constant curvature for all moments

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9. The mechanism method and the statical method give

1. lower and upper bounds respectively on the strength of structure

2. upper and lower bounds respectively on the strength of structure

3. lower bound on the strength of structure

4. upper bound on the strength of structure

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

1. 1.18

2. 1.414

3. 1.67

4. 1.81

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11. The least dimension in case of a circular column of diameter D is taken as

1. 0.5 D

2. 0.68 D

3. 0.88 D

4. D

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12. 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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13. 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

1. 0.5 Only

2. 0.1 Only

3. between 0.5 and 1.0

4. 0.2 Only

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14. 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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15. 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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16. 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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17. The basic wind speed is specified at a height ‘h’ above mean ground level in an open terrain. The value of ‘h’ is

1. 10 m

2. 20 m

3. 25 m

4. 50 m

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18. 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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19. Bearing stiffeners are provided at i) the supports, ii) the mid span, iii) the point of application of concentrated loads. The correct answer is

1. only (i)

2. both (i) and (ii)

3. both (i) and (iii)

4. (i), (ii) and (iii)

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20. 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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21. Horizontal stiffener in a plate girder is provided to safe guard against

1. shear buckling of web plate

2. compression buckling of web plate

3. yielding

4. all of the above

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22. 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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23. 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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24. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between

1. 10° to 30°

2. 30° to 40°

3. 40° to 70°

4. 90°

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

1. 180

2. 200

3. 250

4. 350

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26. A circular column section is generally not used in actual practice because

1. it is uneconomical

2. it cannot carry the load safely

3. it is difficult to connect beams to the round sections

4. all of the above

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27. 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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28. A butt weld is specified by

1. effective throat thickness

2. plate thickness

3. size of weld

4. penetration thickness

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29. 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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30. 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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31. 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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32. 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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33. 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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34. If the size of a column is reduced above the floor, the main bars of the column, are

1. Continued up

2. Bent inward at the floor level

3. Stopped just below the floor level and separate lap bars provided

4. All the above

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35. According to the steel beam theory of doubly reinforced beams

1. Tension is resisted by tension steel

2. Compression is resisted by compression steel

3. Stress in tension steel equals the stress in compression steel

4. All the above

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36. 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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37. 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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38. The steel generally used in R.C.C. work, is

1. Stainless steel

2. TOR Steel

3. Mild steel3

4. High tension steel

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39. 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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40. 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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41. 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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42. The three moments equation is applicable only when

1. The beam is prismatic

2. There is no settlement of supports

3. There is no discontinuity such a hinges within the span

4. The spans are equal

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43. 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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44. 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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45. For a continuous slab of 3m 3.5m size, the minimum overall depth of slab to satisfy vertical deflection limits is?

1. 50 mm

2. 75 mm

3. 100 mm

4. 120 mm

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46. For a simply supported beam of span 15m, the maximum effective depth to satisfy vertical deflection limit should be?

1. 600 mm

2. 750 mm

3. 900 mm

4. More than 1 m

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

1. 26°/2°

2. 30°

3. 35°

4. 40°

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49. 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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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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