1. The phenomena of development of internal tensile stresses in a concrete member by means of tensioning devices are called as
Correct : C. prestressing of concrete
2. In reinforced concrete members the prestress is commonly introduced by
Correct : A. tensioning the steel reinforcement
3. Which of the following basic concept is involved in the analysis of prestressed concrete members?
Correct : A. combined and bending stresses
4. The prestressing of concrete member is carried out to reduce
Correct : A. compressive stresses
5. The earliest examples of wooden barrel construction by force-fitting of metal bands and shrink-fitting of metal tiers of wooden wheels indicate the art of
Correct : A. prestressing
6. The concept is used in many branches of civil engineering and building construction?
Correct : B. prestressed concrete
7. The attempt to introduce permanently acting forces in concrete to resist the elastic forces is
Correct : A. prestressing
8. In reinforced concrete members, the prestress commonly introduced is
Correct : A. tensioning steel reinforcement
9. Development of early cracks in reinforced concrete is due to
Correct : A. strains of steel
10. The significant observations which resulted from the pioneering research on prestressed concrete were
Correct : A. high strength steel and losses of prestress
11. The necessity of high strength concrete in prestressed concrete is due to
Correct : A. shear and bonding
12. In the zone of anchorages the material preferred to minimize costs is
Correct : D. high strength concrete
13. The length of the prestressing tendon between the end of the member and the point where the steel attains its stress is called
Correct : D. transmission length
14. In cab cable, the curved portion of the tendon and anchors lie in
Correct : C. tension and compression zone
15. The load at which the prestressed member develops its first crack is called as
Correct : D. cracking load
16. In circular prestressing members, the tendons are supplied in form of
Correct : D. rings
17. In case of continuous prestressed concrete members to gain continuity, splicing is done by
Correct : D. tendons
18. The phenomena of drying process of contraction concrete refer to
Correct : B. shrinkage of concrete
19. The ratio between the creep strain and elastic strain of concrete is defined as
Correct : C. creep coefficient
20. The phenomena of reduction of stress in steel at a constant strain are known as
Correct : C. de bonding
21. A device which helps the tendons to transmit prestress to the member and maintain it for the design period is?
Correct : C. tendon
22. Which of the following type of prestress applied to concrete in which tensile stresses to a limited degree are permitted is known as
Correct : B. partial prestressing
23. Prevention of bond between the steel and concrete is known as
Correct : C. de bonding
24. Which one of the following is the basic assumption involved in designing of prestressed concrete members?
Correct : A. plane member remains plane before and after bending
25. The compression in concrete and tension in steel are developed by?
Correct : B. expansion cements
26. In pre-tensioning system, after curing and hardening of concrete the reinforcement is set
Correct : B. fixed
27. The method of prestressing the concrete after it attains its strength is known as
Correct : B. post tensioning
28. The ultimate strength of high tensile steel is
Correct : B. 2100
29. The high tensile steel is obtained by increasing content of
Correct : A. carbon content in steel
30. The permissible stress in prestressing steel should not exceed
Correct : A. 80%
31. When the concrete attains sufficient strength, which elements are released?
Correct : A. jacks
32. Which is one of the systems used for pretensioning?
Correct : D. hoyer’s long line method
33. Hoyer’s system of pre tensioning is generally adopted for
Correct : B. large scale members
34. The transfer of prestress of concrete is achieved by
Correct : D. jacks
35. The bond of prestressing wires in Hoyer’s system can be formed by
Correct : A. helical crimping
36. The Hoyer’s method of prestressing is done by
Correct : A. pulling out of wires
37. Hoyer’s system of pretensioning can be done for beams.
Correct : B. more than 2
38. In post tensioning, the concrete units are cast by
Correct : A. ducts
39. After the tensioning operation, the space between the tendons and the ducts are
Correct : B. grouted
40. A slab without beam is called as
Correct : C. flat slab
41. According to IS 456: 2000, a flat slab can be design by direct design method if there are continuous span in each direction
Correct : A. minimum 3
42. A flat slab can be design by
Correct : C. both (a) and (b)
43. The panels shall be rectangular, and the ratio of the longer span to the shorter span within a panel shall
Correct : B. not be greater than 2.0
44. In flat slab design, in an interior span total design moment Mo shall be distributed in proportion
Correct : D. 65 % negative design moment & 35 % positive design moment
45. In direct design method of flat slab design, At an interior support, the column strip shall be designed to resist
Correct : C. 75 percent of the total negative moment in the panel at that support
46. In direct design method of flat slab design, At an exterior support, the column strip shall be designed to resist the
Correct : A. total negative moment in the panel at that support.
47. In flat slab design, The drops when provided shall be rectangular in plan, and have a length in each direction
Correct : D. not less than one third of the panel length in that direction
48. In flat slab design, the column strip shall be designed to resist
Correct : A. 60 percent of the total positive moment in the panel
49. In flat slab design, the middle strip shall be designed to resist
Correct : B. 40 percent of the total positive moment in the panel
50. In design of flat slab, The critical section for shear shall be at a distance
Correct : A. effective depth /2 from the periphery of the column/capital/drop panel
51. In flat slab design, When drop panels are used, the thickness of drop panel for determination of area of reinforcement shall be
Correct : C. lesser of (a) and (b)
52. In flat slab design, let τv = shear stress at critical section and τc = permissible shear stress in concrete , then no shear reinforcement is required
Correct : A. if τv < τc
53. In flat slab design, let τv = shear stress at critical section and τc = permissible shear stress in concrete , then shear reinforcement shall be provided
Correct : B. if τc < τv < 1.5 τc
54. In flat slab design, let τv = shear stress at critical section and τc = permissible shear stress in concrete , then flat slab is redesigned
Correct : D. if τv > 1.5τc
55. In flat slab design, the moment at the support of column strip is
Correct : C. negative
56. In limit state method of design of flat slab, τc = permissible shear stress in concrete
Correct : A. τc = 0.25 √fck
57. In working method of design of flat slab, τc = permissible shear stress in concrete
Correct : B. τc = 0.16 √fck
58. In direct design method of flat slab, total design moment Mo is 945 kNm then negative design moment in middle strip is
Correct : B. 245.70 knm
59. In direct design method of flat slab, total design moment Mo is 945 kNm then negative design moment in column strip is
Correct : A. 368.55 knm
60. In direct design method of flat slab, total design moment Mo is 945 kNm then positive design moment in middle strip is
Correct : D. 132.30 knm
61. In direct design method of flat slab, total design moment Mo is 945 kNm then positive design moment in column strip is
Correct : C. 198.45 knm
62. In direct design method of flat slab, total design moment Mo is 945 kNm then positive design moment is
Correct : A. 330.75 knm
63. In direct design method of flat slab, total design moment Mo is 945 kNm then negative design moment is
Correct : B. 614.25 knm
64. The pressure exerted by the retained material on the retaining wall is called
Correct : D. both (a) and (b)
65. A retaining wall which resist the earth pressure due to backfill by its dead weight is called
Correct : A. cantilever retaining wall
66. Cantilever RC retaining wall proves to be economical for height
Correct : A. 5m to 7m
67. Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then the intensity of active earth pressure per unit area of wall at any depth ‘h’ below top of the wall is given by
Correct : A. pa = ka ϒ h
68. Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then total pressure at any height ‘h’ below top of the wall is given by
Correct : C. pa = ka ϒ h2 /2
69. Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then bending moment at any height ‘h’ below top of the wall is given by
Correct : D. pa = ka ϒ h3 /6
70. Coefficient of active earth pressure ka
Correct : A. ka = 1-sinϕ / 1+sinϕ
71. Coefficient of passive earth pressure kp
Correct : C. kp = 1+sinϕ / 1-sinϕ
72. The relation between ka = coefficient of active earth pressure and kp = coefficient of passive earth pressure is
Correct : C. kp =9 x ka
73. The vertical stem of cantilever retaining wall is subjected to
Correct : A. varying earth pressure developing tensile stresses on earth side
74. The heel slab of cantilever retaining wall is subjected to
1. Varying earth pressure developing tensile stresses on earth side
2. Downward force due to weight of earth above the heel slab
3. Downward force of self-weight of slab
4. Upward soil pressure
Correct : D. 2, 3 and 4
75. The toe slab of cantilever retaining wall is subjected to
1) Varying large Upward soil pressure
2) Downward force due to weight of earth above the heel slab
3) Downward force of self-weight of slab
Correct : C. only 1 and 3
76. To stabilize a concrete cantilever retaining wall against sliding, the ratio of sliding force to resisting force should be
Correct : D. ≤ 0.645
77. To stabilize a concrete cantilever retaining wall against sliding, the ratio of resisting force to sliding force should be
Correct : A. ≥ 1.55
78. In retaining wall to prevent the sliding of wall sometimes
Correct : A. shear key is provided
79. If the angle of repose is 31º the coefficient of active earth pressure is
Correct : B. 0.32
80. The temperature and shrinkage reinforcement provided in retaining wall for mild steel
Correct : B. 0.15% of gross sectional area
81. The temperature and shrinkage reinforcement provided in retaining wall for HYSD reinforcement is
Correct : A. 0.12% of gross sectional area
82. For stability of retaining wall against retaining wall the factor of safety against overturning
Correct : A. should not less than 1.55
83. If embankment is sloping at an angle of 18º to the horizontal, the coefficient of active earth pressure is
Correct : B. 0.36
84. If angle of repose is 30º then Coefficient of active earth pressure ka
Correct : C. 1/3
85. If angle of repose is 30º then Coefficient of passive earth pressure kp
Correct : A. 3
86. The maximum permissible eccentricity of a retaining wall of width B to avoid failure in tension is
Correct : C. b/6
87. Let height of retaining wall is 5.1m, ϒ=unit weight of backfill is 18kN/m3 and ka = coefficient of active earth pressure is 0.32, then total pressure at height 5.1m below top of the wall is given by
Correct : A. 74.90 kn
88. Let height of retaining wall is 5.1m, ϒ=unit weight of backfill is 18kN/m3 and ka = coefficient of active earth pressure is 0.32, then bending moment at height 5.1m below top of the wall is given by
Correct : C. 127.34 knm
89. In axially prestressed concrete members, the steel is under
Correct : B. tension
90. In axially prestressed members, the concrete is under
Correct : B. compression
91. Prestressing is possible by using
Correct : C. high-tensile steel
92. Prestressing steel has an ultimate tensile strength nearly
Correct : C. four times that of hysd bars
93. Prestressing is economical for members of
Correct : A. long span
94. Linear prestressing is adopted in
Correct : C. beams
95. Circular prestressing is advantageous in
Correct : C. pipes and tanks
96. Prestressing wires in electric poles are
Correct : A. concentric
97. In the construction of large circular water tanks, it is economical to adopt
Correct : B. prestressed concrete
98. In cable-stayed bridges, the cables supporting the deck of the bridge are under
Correct : D. tension
99. The grade of concrete for prestressed members should be in the range of
Correct : C. m-30 to m-60
100. High-strength mixes should have a water/cement ratio of