### Civil Engineering - Structural Design Specifications MCQs Part 2

1. The permissible bending stresses Pbet for steel slab bases should not exceed

A.
1500 kg/cm2
B.
1650 kg/cm2
C.
1800 kg/cm2
D.
1890 kg/cm2

2. Pick up the correct statement from the following:

A.
The diameter of a rivet, before driving is taken as the nominal diameter of the rivet
B.
The diameter of the rivet hole is taken as the gross area of the rivet
C.
For rivets of nominal diameters less than 25 mm, the diameter of the rivet hole is taken as the nominal diameter of the rivet plus 1.5 mm
D.
For rivets of nominal diameters exceeding 25 mm, the diameter of the rivet hole is taken as the nominal diameter of the rivet plus 2 mm
E.
All the above.

3. For nominal mix concrete M 15, the required weight of fine and coarse aggregates is 350 kg and the volume of water is

A.
30 litres
B.
32 litres
C.
34 litres
D.
45 litres

4. The maximum characteristic strength of the stirrups reinforcement, is taken

A.
350 N/mm2
B.
375 N/mm2
C.
395 N/mm2
D.
415 N/mm2
E.
none of these.

5. Pick up the correct statement from the following:

A.
The distance between centres of two adjacent rivets in line with the direction of stress shall not exceed 16 t or 200 mm whichever is less in tension members
B.
The distance between the centres of two adjacent rivets in line with the direction of stress shall not exceed 12 t or 203 mm whichever is less in compression members
C.
The minimum pitch of rivets should not be less than 2.5 times the diameter of the rivet hole
D.
The distance between centres of any two consecutive rivets in a line adjacent and parallel to an edge of an outside plate shall hot exceed 100 mm + 4 t or 200 mm whichever is less both in compression and tension
E.
All the above.

6. Moist sand may contain surface water by mass upto

A. 7.5%
B. 5.0%
C. 2.5%
D. 1.25%

7. The minimum horizontal distance between two parallel main reinforcing bars, is

A. the diameter of the bar if their diameters are same
B. the diameter of the longer bar if their diameters are unequal
C. 5 mm more than nominal maximum size of the coarse aggragate
D. greatest value of the above.

8. Pick up the correct statement from the following:

A. For steel castings, the minimum tensile strength is 41 kg/mm2 and minimum yield stress is 20.5 kg/mm2
B. For mild steel the minimum tensile strength is 44 kg/mm2 and minimum elongation of 23% on a gauge length of 5.65A
C. For high tensile steel, the minimum tensile strength is 58 kg/mm2
D. All the above.

9. Pick up the correct statement from the following:

A. The unit weight of plain concrete is assumed as 2400 N/m3
B. The unit weight of reinforced concrete is assumed as 2500 N/m3
C. The dead load includes self weight of the structural member plus weight of finishes and walls or partitions
D. All the above.

10. The spans of filler joists supporting a slab may be considered approximately equal if the longest span does not exceed the shortest span more than

A. 5%
B. 10%
C. 15%
D. 20%

11. The thickness of the steel

A. exposed to weather and accessible for repainting, should be not less than 6 mm
B. in main members not directly exposed to weather should not be less than 6 mm
C. in secondary members not directly exposed to weather shall be not less than 4.5 mm
D. All the above.

12. Bending moment values for filler joists

A. near middle of end span is +
B. at support next to end support is -
C. at middle of interior spans is +
D. at other interior supports is -
E. all the above.

13. A solid slab spanning in two directions at right angles and carrying a uniformly distributed load, is supported on beams. If the length of two such beams A and B perpendicular to each other are x and y (x
A.
B.
C.
D.

14. The anchorage value of standard U-type hook of a reinforcing bar of diameter d in tension, is

A. 4 d
B. 8 d
C. 12 d
D. 16 d
E. 20 d

15. A simply supported beam shall be deemed to be a deep beam if the ratio of its effective span to overall depth, is

A. 2.0
B. 2.5
C. less than 2
D. less than 2.5

16. For concreting of heavily reinforced sections without vibration, the workability of concrete should be

A. very low
B. low
C. medium
D. high.

17. If b is actual width of a flange, Dt is the thickness of the flange, bω is the breath of the web, lo is the distance between the points of zero moments in a beam, the effective width of the flange, is

A.
B.
C.
D.

18. The thickness 't' of a rectangular column base which is provided for distributing the load uniformly, is calculated from the formula

A.
B.
C.
D.

19. In the formula a + bk for the calculation of the net effective section of single tee in tension connected by flange to the same side of the same side of the gusset, the value of 'k' is taken

A.
B.
C.
D.

20. All reinforcement should be free from

A. loose mill scales
B. loose rust
C. paints
D. oil
E. all the above.

21. If fck is the characteristic cube strength of concrete in N/mm2, the modulus of elasticity of structural concrete Ec = afck where the value of a, is

A. 5900
B. 5800
C. 5700
D. 5600
E. 5500

22. The effective depth of a shallow beam is the distance between

A. maximum compression and tension fibres
B. neutral axis and maximum compression fibre
C. neutral axis and maximum tension fibre
D. maximum compression fibre and the centroid of the tension reinforcement
E. none of these.

23. The minimum area of cross section of reinforcement in either direction of a slab should not be less than ...... of the slab cross section

A. 0.75%
B. 0.10%
C. 0.15%
D. 0.20%

24. Pick up the correct statement from the following:

A. The effective span of a simply supported beam is clear span plus its effective depth or centre to centre of supports whichever is less
B. The effective span of a simply supported slab is clear span plus its effective depth or centre to centre of supports whichever is less
C. The effective span of a continuous beam or slab is the clear span plus its effective depth or centre to centre of supports whichever is less, provided the width of the support is less than of clear span
D. For spans with roller or rocker bearing, the effective span is the distance between the centres of bearings
E. All the above.

25. Pick up the correct statement for the web stiffeners.

A. vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
B. d is the distance between flange angles or the clear distance between flanges
C. for horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange
D. all the above.

26. Removal of props under

A. slabs spanning upto 4.5 m is 7 days
B. slabs spanning more than 4.5 m is 14 days
C. beams spanning upto 6 m is 14 days
D. beams spanning more than 6 m is 21 days
E. all the above.

27. To achieve uniform colour and consistency of the concrete by using ordinary Portland cement, the mixing time may be

A. to 1 minute
B. 1 to minutes
C. to 2 minutes
D. 2 to minutes
E. none of these.

28. For calculating critical compression stress in bending Cs for sections symmetrical about the x-x axis, from the formula , the value of G is taken

A. 0.2 E
B. 0.3 E
C. 0.4 E
D. 0.5 E

29. For the proportions

A. 1 : the maximum size of aggregates, is 10 mm
B. 1 : 2 the maximum size of aggregates, is 20 mm
C. 1 : the maximum size of aggregates, is 40 mm
D. All the above.

30. Columns are designed for a minimum eccentricity equal to 1/30 (unsupported length ofthe column), subject to a minimum of

A. 5 mm
B. 10 mm
C. 15 mm
D. 20 mm

31. The minimum diameter of longitudinal reinforcement of a column should not be less than

A. 6 mm
B. 8 mm
C. 10 mm
D. 12 mm
E. 20 mm

32. For all practical purposes, the modulus of elasticity of steel is assumed

A. 200 kN/mm2
B. 225 kN/mm2
C. 250 kN/mm2
D. 275 kN/mm2

33. The grade of reinforced concrete to be used in sea water or structures exposed to sea water should be

A. M 10
B. M 15
C. M 20
D. M 30

34. If the specified thickness of a footing is 100 cm, the depth of the form work may be tolerated from

A. - 2 mm to + 2 mm
B. - 3 mm to + 3 mm
C. - 4 mm to + 4 mm
D. - 5 mm to + 5 mm

35. If the main reinforcement of the slab is parallel to a T-beam, the transverse reinforcement at mid span of the slab is provided at least ......of main reinforcement

A. 40%
B. 50%
C. 60%
D. 70%.

36. For achieving suitably a low permeability

A. strong and dense aggregates are used
B. low water - cement ratio is used
C. proper curing is done for hydration
D. proper compaction is done
E. All the above.

37. Minimum thickness of steel work directly exposed to weather and accessible for cleaning and repainting, the thickness should be not less than

A. 4 mm
B. 6 mm
C. 8 mm
D. 7 mm

38. In limit state method, the design bond stress of M 30 grade concrete for plain bars in tension, is

A. l.O N/mm2
B. 1.2 N/mm2
C. 1.4 N/mm2
D. 1.5 N/mm2

39. If the end of a beam of span L carrying a designed load W is partially restrained by a built up wall, it is designed to resist the negative moment at the face of the support, equal to

A.
B.
C.
D.
E.

40. Generally acceptable nominal size of aggregates for reinforced concrete, is

A. 10 mm
B. 15 mm
C. 20 mm
D. 25 mm
E. 40 mm

41. For spans upto 10 m, the safe span to depth ratio for

A. cantilever is 7
B. simply supported beams is 20
C. continuous beams is 26
D. all the above.

42. The angle of inclination of the lacing bars with axis of the member is kept between

A. 20° and 50°
B. 30° and 60°
C. 40° and 70°
D. 50° and 80°

43. The distance of the critical section for shear from the periphery of the column or drop panal is at a distance (where d is effective depth of flat slab).

A. d
B.
C.
D.

44. If fck is characteristic compressive strength of concrete, the flexural and split tensile strength fcr = afck N/mm2 where the value of a is

A. 0.4
B. 0.5
C. 0.6
D. 0.7
E. 0.8

45. Pick up the correct statement from the following:

A. Net sectional area of a tension member is its gross area less deductions for holes
B. Gross diameter of river hole is 1.5 mm in excess of its normal diameter if it is greater than 25 mm
C. Gross diameter of the rivet hole is 2.0 mm in excess of its normal diameter if it is greater than 25 mm
D. The total deduction area for the holes is obtained by the product of the thickness and sum of the diameters of the holes in any chain across the member
E. All the above.

46. The value of the constant K in the formula for determining the minimum area of tension reinforcement in a beam is

A. 0.95
B. 0.90
C. 0.85
D. 0.80

47. The concrete may be accepted if the average equivalent cube strength of the cores, is at least 85% of the cube strength of the concrete grade at the specified age and no individual core possesses strength less than

A. 90%
B. 85%
C. 80%
D. 75%
E. 70%

48. The slenderness ratio of a tie in a roof truss if subjected to action of wind and seismic forces, should not be greater than

A. 180
B. 210
C. 250
D. 350

49. For concreting of shallow sections with vibration, the work ability of concrete should be

A. very low
B. low
C. medium
D. high.

50. The slenderness effect of a wall is considered if the effective height of the wall exceeds the thickness

A. 8 times
B. 10 times
C. 12 times
D. 16 times