design of concrete structures MCQs – Page 3

Practise focused design of concrete structures questions with marked answers for exam preparation and subject revision.

design of concrete structures Mcqs
41. The limits of percentage p of the longitudinal reinforce-ment in a column is given by_____________?
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A. 0.15% to 2%

B. 0.8% to 4%

C. 0.8% to 8%

D. 0.8% to 6%
42. For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankines theory_______________?
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A. is always greater than 1

B. can be less than 1

C. is always less than 1

D. can be more than 1

43. For walls, columns and vertical faces of all structural members, the form work is generally removed after______________?
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A. 24 to 48 hours

B. 7 days

C. 14 days

D. 3 days

44. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________?
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A. above 0.92

B. 0.75-0.80

C. 0.80-0.85

D. 0.85 0.92

45. The average permissible stress in bond for plain bars in tension is_______________?
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A. increased by 25% for bars in compression

B. decreased by 10% for bars in compression

C. decreased by 25% for bars in compression

D. increased by 10% for bars in compression

46. Admixtures which cause early setting, and hardening of concrete are called_______________?
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A. retarders

B. accelerators

C. workability admixtures

D. air entraining agents

47. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be________________?
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A. 900 mm

B. 750 mm

C. more than 1 m

D. 600 mm

48. Increase in the moisture content in concrete_________________?
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A. all of the above

B. does not change the strength

C. reduces the strength

D. increases the strength

49. As compared to ordinary portland cement, high alumina cement has______________?
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A. higher initial setting time but lower final setting time

B. lower initial and final setting times

C. lower initial setting time but higher final setting time

D. higher initial and final setting times

50. To minimise the effect of differential settlement, the area of a footing should be designed for______________?
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A. live load + fraction of dead load

B. dead load only

C. dead load + live load

D. dead load + fraction of live load
51. The approximate value of the ratio between direct tensile strength and flexural strength is_____________?
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A. 0.75

B. 0.5

C. 1

D. 0.33

52. One of the criteria for the effecvve width of flange of T-beam is bf =+ bw +6Df 6 In above formula, l0 signifies_______________?
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A. clear span of the T-beam

B. effective span of T-beam

C. distance between points of zero moments in the beam

D. distance between points of maximum moments in the beam

53. If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section_______________?
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A. depends on as, only

B. depends on aCbC only

C. depends on both crst and acbc

D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression

54. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is_______________?
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A. 32 liters

B. 28 liters

C. 30 liters

D. 34 liters

55. For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is__________________?
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A. 75 mm

B. 50 mm

C. 100 mm

D. 120 mm

56. The factor of safety for______________?
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A. steel is higher than that for concrete

B. steel and concrete are same

C. steel is lower than that for concrete

D. none of the above

57. The minimum cover to the ties or spirals should not be less than________________?
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A. 50mm

B. 20 mm

C. 25 mm

D. 15 mm

58. The ratio of the diameter of reinforcing bars and the slab thickness is_______________?
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A. 4-Jan

B. 1/8

C. 5-Jan

D. 6-Jan

59. Approximate value of shrinkage strain in concrete, is________________?
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A. 0.00003

B. 0.03

C. 0.0003

D. 0.003

60. The permissible diagonal tensile stress in reinforced brick work is_____________?
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A. about 1.0 N/mm2

B. 0.3 N/mm2 to 0.7 N/mm2

C. about 0.1 N/mm2

D. zero