Multiple Choice Questions and Answers (MCQs) on Structural Design Specifications

01. Pick up the incorrect statement from the following:

(A) The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness
(B) The gross section of the web of channels is the depth of the web multiplied by its thickness
(C) The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness
(D) None of these

2. For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to

(A) 5 mm less than the minimum clear distance between the main bars
(B) 5 mm less than the minimum cover to the reinforcement
(C) Smaller of (a) and (b)
(D) Greater of (a) and (b)

03. For under water concreting.

(A) At least 10 percent more cement is required as compared to dry conditions
(B) The volume of coarse aggregates shall not be less than one and half times and not more than twice that of fine aggregate
(C) Dewatering by pumping is not done or until 24 hours thereafter (D) All the above

04. The effective length of lacing is the distance

(A) Between the inner end rivets of the bar for single lacing
(B) 0.7 of the distance between the inner end rivets of the bar for double lacing
(C) Between the inner ends of effective lengths of welds connecting the members
(D) All the above

05. The effective and actual lengths of a cantilever are same if continuous at the support,

(A) Unstrained against torsion at the support and free at the end
(B) With partial restraint against torsion of the support and free at the end
(C) Restrained against torsion at the support and free at the end
(D) None of these

06. In the formula t = √[(3W/fbct) (A² – B₂/4)]

(A) A and B are the dimensions of the column
(B) A and B are the dimensions of the base plate
(C) A is the greater projection of the plate beyond the column
(D) Both (c) and (d) of above

07. 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

08. 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 aggregate (D) Greatest value of the above

09. 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

10. 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

11. The thickness of the rectangular plate for the cap or base of a solid round steel columns, is calculated from the formula t = √[(9W/16 fbct) × D/(D -d)] where ‘d’ is

(A) The reduced diameter of the column
(B) The dimension of the base
(C) The diameter of the base
(D) The diameter of the top

12. The test strength of the sample is taken as the average of the strength of

(A) 2 specimens
(B) 3 specimens
(C) 4 specimens
(D) 5 specimens

13. For the stability of a structural part, the weight or anchorage should be

(A) 1.2 times the minimum overturning moment due to dead load (B) 1.4 times the minimum overturning moment due to dead load (C) Sum of (a) and (b)
(D) None of these

14. Pick up the correct statement applicable to cased columns.

(A) Single I-beam or channels back with or without flange plates may be used
(B) The overall dimensions of the steel section do not exceed 750 × 450 mm over plate if used
(C) The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
(D) All the above

15. 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 %

16. 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 exceeding 25 mm, the diameter of the rivet hole is taken as the nominal diameter of the rivet plus 2 mm
(D) All the above

17. 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) All the above

18. 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

19. For design purpose, the moment at the support where two unequal spans or spans not equally loaded meet, is

(A) Lesser value
(B) Greater value
(C) Average of two values
(D) None of these

20. All reinforcement should be free from

(A) Loose mill scales
(B) Loose rust
(C) Paints
(D) All the above

21. Pick up the correct statement from the following:

(A) The cover of a longitudinal reinforcing bar in a column is kept not less than the diameter of the bar or 40 mm
(B) The cover of a longitudinal reinforcing bar in beam is kept not less than the diameter of the bar or 25 mm
(C) The end cover of a longitudinal reinforcing bar in a beam is kept not less than twice the diameter or 25 mm
(D) All the above

22. 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) For spans with roller or rocker bearing, the effective span is the distance between the centres of bearings
(D) All the above

23. The thickness of flat double lacing is taken (where ‘l’ is the effective length of the bar).

(A) l/20
(B) l/30
(C) l/40
(D) l/60

24. Pick up the correct statement regarding columns.

(A) The cross sectional area of longitudinal reinforcement, should not be less than 0.8% nor more than 4% of its gross sectional area (B) The minimum of longitudinal bars provided in rectangular and circular columns are 4 and 6 respectively
(C) If the effective length of a column is less than three times its lateral dimension, it is generally called a pedestal
(D) All the above

25. The actual length of a column provided with a cap and base, is the distance between

(A) Top of the base and underside of the cap
(B) Bottom of the base and underside of the cap
(C) Top of the base and top of the cap
(D) Bottom of the base and top of the cap

26. The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days, should be a minimum of

(A) 7 N/mm2
(B) 10 N/mm2
(C) 15 N/mm2
(D) 20 N/mm2

27. For deformed reinforcing bars, the permissible design bond stress may be increased by

(A) 20 %
(B) 30 %
(C) 40 %
(D) 60 %

28. The overall depth of a solid slab is 20 cm and effective depth is 15 cm. The horizontal distance between parallel main reinforcement should not be more than

(A) 30 cm
(B) 40 cm
(C) 45 cm
(D) 60 cm

29. 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

30. The slenderness ratio of single angle discontinuous struts connected by a single rivet or bolt, shall not exceed

(A) 110
(B) 130
(C) 150
(D) 180

31. 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) All the above

32. 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

33. The pitch of transverse reinforcement of a column is taken as

(A) Least lateral dimension of the compression member
(B) Sixteen times the smallest diameter of the longitudinal reinforcement of the column
(C) Forty eight times the diameter of the transverse reinforcement (D) Least value of the above

34. Bending moment values for filler joists

(A) Near middle of end span is + wL2/10
(B) At support next to end support is – wL2/10
(C) At middle of interior spans is + wL2/12
(D) All the above

35. The width of lacing bars in mm is kept

(A) Equal to nominal rivet diameter
(B) Twice the nominal rivet diameter
(C) Thrice the nominal rivet diameter
(D) Maximum of the above rounded to nearest 5 mm

36. 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) 1/[1 + 0.25 (b/a)]
(B) 1/[1 + 0.35 (b/a)]
(C) 1/[1 + 0.20 (b/a)]
(D) 1/[1 + 0.5 (b/a)]

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

(A) 4 mm
(B) 6 mm
(C) 7 mm
(D) 8 mm

38. 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 %

39. The maximum bending moment in a purlin of length L when subjected to a distributed load ω, is assumed

(A) ωL/6
(B) ωL/8
(C) ωL/10
(D) ωL/12

40. The area of the concrete in compression plus the area of reinforcement transferred on the basis of modular ratio, is called

(A) Transferred section
(B) Equivalent section
(C) Cracked section
(D) None of these

41. The ratio of the effective lengths of two columns, one effectively held in position at one end and partially restrained at the other end, and the other effectively held in position at one end and free at the other end, is

(A) 1/2
(B) 2/3
(C) 3/4
(D) 3/2

42. The depth ‘d’ of webs without horizontal stiffeners and consisting of tongue plates is taken lesser than the depth of the girder between the flanges less the sum of the depth of the tongue plates, and

(A) Eight times the sum of the thickness of tongue plates
(B) Six times the sum of the thickness of tongue plates
(C) Four times the sum of the thickness of tongue plates
(D) None of the above

43. 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) All the above

44. The concrete is deemed not to comply with the strength requirements if the strength is less than the greater of

(A) Characteristic strength minus 1.35 times the standard deviation (B) 0.8 times the characteristic strength
(C) The average strength of all the samples is less than the characteristic strength plus [1.65 – 3/number of samples] times the standard deviation
(D) All the above

45. 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) WL/10
(B) WL/12
(C) WL/16
(D) WL/24

46. The maximum deflection of a structure should not normally exceed lesser of the span/350 or

(A) 10 mm
(B) 15 mm
(C) 20 mm
(D) 25 mm

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

(A) 0.4
(B) 0.5
(C) 0.6
(D) 0.7

48. The reduced level of third floor of a building near a column is 205.350 m. The reduced levels of the undersides of four beams supporting the fourth floor framing into the column mutually perpendicular are 208.350 m, 208.450 m, 208.500 m and 208.550 m. The supported length of the column is

(A) 3.000 m
(B) 3.100 m
(C) 3.150 m
(D) 3.200 m

49. When bending occurs about both axes of the member, the value of fbe in the formula (fc/Pc) + (fbe /Pb) |> 1 is taken

(A) Higher value
(B) Lower value
(C) Sum of the two
(D) Difference of the two