Structural Design Online Test - Paper 3

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Vikash chaudhary

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Total Questions: 50
Time Allotted: 50 minutes
Passing Score: 70%
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1 / 50

1. Workability of concrete is inversely proportional to

a) water-cement ratio

b) size of aggregate

c) time of transit

d) none of the above

2 / 50

2. The maximum ratio of span to depth ratio of a slab simply supported and spanning in two directions is

a) 25

b) 30

c) 35

d) 40

3 / 50

3. In R.C.C. beams, the tension reinforcement can be cut off at a point when it is no longer needed if

a) enough bond length is available

b) shear at the cut-off point does not exceed two-thirds of permissible at that section

c) bending moment is zero

d) none of the above

4 / 50

4. For an RCC section, select the most true statement from the following

a) Bond stress = Bond Load/X-area of rebar

b) In a doubly reinforced section, rebars are placed at two tiers on the tensile face

c) Shear stress (π) is perpendicular to the material cross-section

d) Shear stress in rebar is calculated as (π) = Shear force/Nominal surface area of rebar

5 / 50

5. The minimum amount of steel required in RCC column (230x350) is

a) 360 mm²

b) 460 mm²

c) 560 mm²

d) 600 mm²

6 / 50

6. The workability of concrete can be improved by

a) increase the size of aggregate

b) decrease the size of aggregate

c) increase the coarse of aggregate

d) increase the flaky aggregate

7 / 50

7. If the thickness of the slab is 100 mm then the maximum diameter of the bar placed in the slab should be

a) 8 mm

b) 10 mm

c) 12 mm

d) 16 mm

8 / 50

8. The ratio of the effective length of a cantilever column to its height is about

a) 2.5

b) 2.0

c) 1.5

d) 1.0

9 / 50

9. The long column takes a lesser load as compared to a short column due to

a) buckling

b) concrete

c) steel

d) length

10 / 50

10. A reinforced concrete beam will crack if tensile stress set up in the concrete below the neutral axis is

a) less than the permissible stress

b) more than the permissible stress

c) equal to the permissible stress

d) any one of the above

11 / 50

11. In R.B. slab, the permissible compressive stress in bricks is generally taken as

a) 10 kg/cm²

b) 20 kg/cm²

c) 30 kg/cm²

d) 40 kg/cm²

12 / 50

12. In a beam section, if the steel reinforcement is of such a magnitude that the permissible stresses in concrete and steel are developed simultaneously, the section is known as

a) balanced section

b) critical section

c) economical section

d) any one of the above

13 / 50

13. The slenderness ratio of an RCC column is given by (Where, r=radius of gyration, l=effective length, B=width, D=diameter)

a) l/r

b) l/B

c) l/D

d) none of the above

14 / 50

14. The types of failure occurring in a beam due to shear force is termed as

a) diagonal tension failure

b) flexural tension failure

c) diagonal compression failure

d) all of the above

15 / 50

15. An RCC element, 1 m deep and 0.5 m wide will require minimum reinforcement @ 1% of the gross sectional area, what will be the area of reinforcing bars?

a) 500 mm²

b) 1000 mm²

c) 5000 mm²

d) 50,000 mm²

16 / 50

16. In a slab, the pitch of the main reinforcement should not exceed its effective depth

a) three times

b) four times

c) five times

d) six times

17 / 50

17. The minimum cover in a slab is neither less than the diameter of the bar nor less than

a) 15 mm

b) 20 mm

c) 25 mm

d) 30 mm

18 / 50

18. The center-to-center spacing of vertical stirrups in a rectangular beam is

a) minimum near the support

b) maximum near the support

c) minimum near the center

d) none of the above

19 / 50

19. The initial and final setting times for ordinary Portland cement are approximately related by (where T & t are the final and initial setting times)

a) T = 540+t

b) T = 270+t

c) T = 90+1.2t

d) T = 90+t

20 / 50

20. The spacing of transverse reinforcement of a column is decided by the following consideration

a) the least lateral dimension of the column

b) sixteen times the diameter of the smallest longitudinal reinforcing rod in the column

c) forty-eight times the diameter of transverse reinforcement

d) all of the above

21 / 50

21. Main reinforcement in an RCC beam is used for

a) bending moment

b) shear force

c) moment of resistance

d) none of the above

22 / 50

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

a) tension is resisted by tension steel

b) compression is resisted by compression steel

c) stress in tension steel equals the stress in compression steel

d) all of the above

23 / 50

23. The length of the straight portion of a bar beyond the end of the hook should be at least

a) four times the diameter

b) five times the diameter

c) six times the diameter

d) seven times the diameter

24 / 50

24. The factor of safety for steel as compared to concrete is

a) same

b) lower

c) higher

d) constant

25 / 50

25. A rib slab is provided for

a) plain ceiling

b) acoustic insulation

c) heat insulation

d) all of the above

26 / 50

26. The minimum thickness of the cover at the end of a reinforcing bar should be twice the diameter of the bar, subjected to a minimum of

a) 10mm

b) 12mm

c) 15mm

d) 25mm

27 / 50

27. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of the bar nor less than

a) 15 mm

b) 20 mm

c) 25 mm

d) 40 mm

28 / 50

28. Unsoundness of cement due to magnesia can be determined by

a) autoclave test

b) Vicat's needle

c) Le Chatelier's apparatus

d) normal consistency

29 / 50

29. Shear in a concrete beam is caused by

a) props only

b) variation of B.M along the span

c) weak bond

d) none of the above

30 / 50

30. The reinforcement is bent at an inclination of angle at the ends of the beam

a) 45°

b) 60°

c) 135°

d) 90°

31 / 50

31. In a rectangular R.C.C beam, the ratio of the maximum shear stress to average shear stress is

a) 1.25

b) 1.33

c) 1.43

d) 1.53

32 / 50

32. A flat slab is supported

a) on beams

b) on columns

c) on beams and columns

d) on columns monolithically built with slab

33 / 50

33. For a reinforced concrete section, the shape of shear stress diagram is

a) wholly parabolic

b) wholly rectangular

c) parabolic above the neutral axis and rectangular below the neutral axis

d) rectangular above the neutral axis and parabolic below the neutral axis

34 / 50

34. For a cantilever beam, the span to effective depth ratio is generally restricted to

a) 7

b) 10

c) 15

d) 20

35 / 50

35. As the size of the cube increases, the strength of the cube

a) decreases

b) increases

c) increases but decreasing rate

d) decreases but decreasing rate

36 / 50

36. Fineness modulus of fine aggregate is between

a) 2-3.5

b) 3.5-5.0

c) 5-6.0

d) 6-7.0

37 / 50

37. A column is considered as a long column if its slenderness ratio is more than

a) 40

b) 20

c) 24

d) 28

38 / 50

38. Due to shrinkage stress, a simply supported beam having reinforcement only at the bottom tends to

a) deflect downward

b) deflect upward

c) deflect upward or downward

d) none of the above

39 / 50

39. The cover provided in the column having size less than 200 mm x 200 mm is

a) 15

b) 20

c) 25

d) 40

40 / 50

40. The designed main bars are placed in a two-way slab

a) along the short span

b) along the long span

c) perpendicular to the length of the slab

d) all of the above

41 / 50

41. In the case of the foundation of rigid base, the distribution pressure on the soil is

a) uniform

b) maximum bending moment

c) minimum in the central zone

d) none of the above

42 / 50

42. Shear reinforcement in an RCC beam is used for

a) bending moment

b) shear force

c) moment of resistance

d) none of the above

43 / 50

43. Segregation is responsible for

a) honeycomb concrete

b) porous layers in concrete

c) sand streaks in concrete

d) all of the above

44 / 50

44. The limits of the percentage of the longitudinal reinforcement in a column are given by

a) 0.8% to 6%

b) 0.8%

c) 1.0% to 4%

d) 1.0% to 6%

45 / 50

45. The diameter of bars normally used in a column is

a) 10-25 mm

b) 12-25 mm

c) 14-25 mm

d) all of the above

46 / 50

46. The ultimate tensile strength of structural mild steel is about

a) 160 N/mm²

b) 260 N/mm²

c) 520 N/mm²

d) 420 N/mm²

47 / 50

47. In the analysis of a doubly reinforced beam, the assumption made is

a) tension is resisted by concrete only

b) compression is resisted by concrete only

c) the deformations in concrete and steel on both sides remain proportional to their distance from the neutral axis

d) all of the above

48 / 50

48. Concrete gains strength due to

a) chemical action of cement with coarse aggregate

b) hydration of cement

c) evaporation of water

d) all of the above

49 / 50

49. If a beam fails in bond, then

a) increase the depth of the beam

b) use thicker but fewer numbers of bars

c) use thinner but more numbers of bars

d) providing vertical stirrups

50 / 50

50. The amount of reinforcement for main bars in a slab is based on

a) minimum shear force

b) maximum shear force

c) minimum bending moment

d) maximum bending moment

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