Home / Civil Engineering / RCC Structures Design :: Section 2

Civil Engineering :: RCC Structures Design

  1. A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis

  2. A.

    remains within the flange

    B.

    remains below the slab

    C.

    coincides the geometrical centre of the beam

    D.

    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. The weight of a foundation is assumed as

  4. A.
    5% of wall weight
    B.

    7% of wall weight

    C.

    10% of wall weight

    D.
    12% of wall weight

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The maximum shear stress (qmax) in a rectangular beam is

  6. A.

    1.25 times the average

    B.

    1.50 times the average

    C.

    1.75 times the average

    D.

    2.0 times the average

    E.

    2.5 times the average.

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. For stairs spanning horizontally, the minimum waist provided is

  8. A.

    4 cm

    B.
    6 cm
    C.

    8 cm

    D.

    10 cm

    E.

    12 cm.

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of

  10. A.

    h/4

    B.

    h/3

    C.

    h/2

    D.

    2h/3

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is

  12. A.
    0.496%
    B.

    0.596%

    C.

    0.696%

    D.

    0.796%

    E.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. The live load to be considered for an inaccessible roof, is

  14. A.
    Nil
    B.

    75 kg/m2

    C.

    150 kg/cm2

    D.

    200 kg/m2

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2, the share stirrups are provided for a distance x from either end where x is

  16. A.
    50 cm
    B.

    100 cm

    C.

    150 cm

    D.

    200 cm

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. The radius of a bar bend to form a hook, should not be less than

  18. A.
    twice the diameter
    B.
    thrice the diameter
    C.
    four times the diameter
    D.
    five times the diameter
    E.

    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. With usual notations the depth of the neutral axis of a balanced section, is given by

  20. A.

    \(\frac { mc } { t } \) = \(\frac { d - n } { n } \)

    B.

    t/mc = n/(d-n)

    C.

    \(\frac { t } { mc } \) = \(\frac { d + n } { n } \)

    D.

    \(\frac { mc } { t } \) = \(\frac { n } { d-n } \)


  21. In a simply supported slab the minimum spacing of distribution reinforcement, should be four times the effective thickness of the slab or

  22. A.

    20 cm

    B.

    30 cm

    C.

    40 cm

    D.

    50 cm

    E.

    60 cm

    View Answer

    Workspace

    Discuss Discuss in Forum


  23. A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is

  24. A.

    30

    B.

    35

    C.

    40

    D.

    45

    E.

    50

    View Answer

    Workspace

    Discuss Discuss in Forum


  25. If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by

  26. A.

    0.2

    B.
    0.3
    C.
    0.4
    D.
    0.5
    E.

    0.7

    View Answer

    Workspace

    Discuss Discuss in Forum


  27.  

    An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is

  28. A.

    8.3 kg/cm2

    B.

    7.6 kg/cm2

    C.
    21.5 kg/cm2
    D.

    11.4 kg/cm2

    View Answer

    Workspace

    Discuss Discuss in Forum


  29. If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a

  30. A.

    simply supported beam

    B.

    continuous beam

    C.

    cantilever beam

    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  31. The toe projection of foundation slabs is taken

  32. A.

    as one third of the base

    B.

    as one sixth of overall height of the wall

    C.

    equal to heel slab

    D.

    below ground surface.

    View Answer

    Workspace

    Discuss Discuss in Forum


  33. For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

  34. A.

    \( \frac { Wl^2} { 4 }\)

    B.

    \( \frac { Wl^2} { 8 }\)

    C.

    \( \frac { Wl^2} { 10 }\)

    D.

    \( \frac { Wl^2} { 12 }\)

    E.

    \( \frac { Wl^2} { 16 }\)


  35. Steel beam theory is used for

  36. A.

    design of simple steel beams

    B.

    steel beams encased in concrete

    C.

    doubly reinforced beams ignoring compressive stress in concrete

    D.

    beams if shear exceeds 4 times allowable shear stress.

    View Answer

    Workspace

    Discuss Discuss in Forum


  37. The advantage of reinforced concrete, is due to

  38. A.

    monolithic character

    B.

    fire-resisting and durability

    C.

    economy because of less maintenance cost

    D.

    moulding in any desired shape

    E.

    All the above.

    View Answer

    Workspace

    Discuss Discuss in Forum


  39. The shear reinforcement in R.C.C. is provided to resist

  40. A.

    vertical shear

    B.

    horizontal shear

    C.

    diagonal compression

    D.

    diagonal tension.

    View Answer

    Workspace

    Discuss Discuss in Forum


  41.  

    An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm φ placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is

  42. A.

    49.9 kg/cm2

    B.

    100 kg/cm2

    C.

    250 kg/cm2

    D.

    175 kg/cm2

    View Answer

    Workspace

    Discuss Discuss in Forum


  43. According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than

  44. A.

    20 cm

    B.

    30 cm

    C.

    40 cm

    D.

    50 cm

    E.

    75 cm

    View Answer

    Workspace

    Discuss Discuss in Forum


  45. The width of the rib of a T-beam, is generally kept between

  46. A.

    \(\frac { 1 } {7 } \) to \(\frac { 1 } {3} \) of rib depth 

    B.

    \(\frac { 1 } {3} \) to \(\frac { 1 } {2} \) of rib depth 

    C.

    \(\frac { 1 } {3} \) to \(\frac { 3} {4} \) of rib depth 

    D.

    \(\frac { 1 } {3} \) to \(\frac { 2} {3} \) of rib depth 


  47.  

    Pick up the true statement from the following:

  48. A.

    Plain ceiling provides the best property diffusing light

    B.

    In the absence of beams, it is easier to install piping

    C.

    In the absence of beams, it is easier to paint

    D.

    A flat slab is capable to withstand concentrated loads

    E.
    All the above.

    View Answer

    Workspace

    Discuss Discuss in Forum


  49. A pile of length L carrying a uniformly distributed load W per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is

  50. A.

    \(\frac { WL } { 8} \)

    B.

    \(\frac { WL ^2} { 24} \)

    C.

    \(\frac { WL ^2} {47} \)

    D.

    \(\frac { WL ^2} {26} \)

    E.

    \(\frac { WL ^2} {16} \)


  51. If bending moment is M, shear force is F effecive depth is d, lever arm is la area of reinforcement is As and sum of the circumferences of main reinforcement is 0, the bond stress based on working stress method, is

  52. A.

    \(\frac { F } { l2O } \)

    B.

    \(\frac { M } { laAs } \)

    C.

    \(\frac { M } { dO }\)

    D.

    \(\frac { F } { Asd }\)


  53. The horizontal portion of a step in a stairs case, is known as

  54. A.

    rise

    B.

    flight

    C.
    winder
    D.

    tread.

    View Answer

    Workspace

    Discuss Discuss in Forum


  55. The length of lap in tension reinforcement should not be less than the bar diameter x (actual tension / four times the permissible average bond stress) if it is more than

  56. A.

    18 bar diameters

    B.

    24 bar diameters

    C.

    30 bar diameters

    D.

    36 bar diameters

    View Answer

    Workspace

    Discuss Discuss in Forum


  57. If K is a constant depending upon the ratio of the width of the slab to its effective span lx is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

  58. A.

    \(\frac { K } {X}\) [ 1+ \(\frac { X} {d}\)] + bW 

    B.

    KX [ 1 - \(\frac { X } { l } \)] + bW

    C.

    KX [ 1+\(\frac { X } { l } \)] -bW

    D.

    Kx [ 1+\(\frac { X } { l } \)] +bW

    E.

    All the above.


  59. If K is a constant depending upon the ratio of the width of the slab to its effective span lx is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

  60. A.

    \(\frac { K } {X}\) [ 1+ \(\frac { X} {d}\)] + bW 

    B.

    KX [ 1 - \(\frac { X } { l } \)] + bW

    C.

    KX [ 1+\(\frac { X } { l } \)] -bW

    D.

    Kx [ 1+\(\frac { X } { l } \)] +bW

    E.

    All the above.


  61. If K is a constant depending upon the ratio of the width of the slab to its effective span lx is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

  62. A.

    \(\frac { K } {X}\) [ 1+ \(\frac { X} {d}\)] + bW 

    B.

    KX [ 1 - \(\frac { X } { l } \)] + bW

    C.

    KX [ 1+\(\frac { X } { l } \)] -bW

    D.

    Kx [ 1+\(\frac { X } { l } \)] +bW


  63. If K is a constant depending upon the ratio of the width of the slab to its effective span lx is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

  64. A.

    \(\frac { K } {X}\) [ 1+ \(\frac { X} {d}\)] + bW 

    B.

    KX [ 1 - \(\frac { X } { l } \)] + bW

    C.

    KX [ 1+\(\frac { X } { l } \)] -bW

    D.

    Kx [ 1+\(\frac { X } { l } \)] +bW

    E.

    All the above.


  65. If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

  66. A.

    \(\frac { WL } { 12 }\) [ L - \(\frac { 2D } { 3 } ]^2\)

    B.

    \(\frac { WL } { 10 }\) [ L + \(\frac { 2D } { 3 } ]^2\)

    C.

    \(\frac { WL } { 10 }\) [ L - \(\frac { 2D } { 3 } ]^2\)

    D.

    \(\frac { WL } { 12 }\) [ L - \(\frac { D } { 3 } ]^2\)


  67.  

    Distribution reinforcement in a simply supported slab, is provided to distribute

  68. A.

    load

    B.
    temperature stress
    C.
    shrinkage stress
    D.
    all the above.

    View Answer

    Workspace

    Discuss Discuss in Forum


  69. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is

  70. A.

    0.107 L

    B.

    0.207 L

    C.

    0.307 L

    D.

    0.407 L

    View Answer

    Workspace

    Discuss Discuss in Forum


  71.  

    The thickness of the topping of a ribbed slab, varies between

  72. A.

    3 cm to 5 cm

    B.

    5 cm to 8 cm

    C.
    8 cm to 10 cm
    D.

    12 cm to 15 cm

    E.

    12 cm to 18 cm

    View Answer

    Workspace

    Discuss Discuss in Forum


  73. To ensure uniform pressure distribution, the thickness of the foundation, is

  74. A.

    kept uniform throughout

    B.

    increased gradually towards the edge

    C.
    decreased gradually towards the edge
    D.

    kept zero at the edge.

    View Answer

    Workspace

    Discuss Discuss in Forum


  75. The maximum ratio of span to depth of a cantilever slab, is

  76. A.

    8

    B.

    10

    C.

    12

    D.

    14

    E.

    16

    View Answer

    Workspace

    Discuss Discuss in Forum


  77. Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to

  78. A.

    shear force

    B.

    area of the section

    C.

    distance of the C.G. of the area from its neutral axis

    D.

    moment of the beam section about its neutral axis

    E.

    width of the beam.

    View Answer

    Workspace

    Discuss Discuss in Forum


  79. In a singly reinforced beam, the effective depth is measured from its compression edge to

  80. A.
    tensile edge
    B.

    tensile reinforcement

    C.
    neutral axis of the beam
    D.

    longitudinal central axis.

    View Answer

    Workspace

    Discuss Discuss in Forum


  81. If a rectangular prestressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be

  82. A.
    5 cm
    B.

    10 cm 

    C.

    15 cm 

    D.

    20 cm 

    E.

    25 cm

    View Answer

    Workspace

    Discuss Discuss in Forum


  83. The depth of the centre of gravity (y) of the resultant compressive stress from the compression edge of the T-beam specified in Q. 13.52 is given by

  84. A.

    Y = \(\frac {3n+2ds } { 2 n+ds} \) x \(\frac { ds } { 3 }\)

    B.

    Y = \(\frac {3n-2ds } { 2 n+ds} \) x \(\frac { ds } { 3 }\)

    C.

    Y = \(\frac {3n+2ds } { 2 n-ds} \) x \(\frac { ds } { 3 }\)

    D.

    Y = \(\frac {3n-2ds } { 2 n-ds} \) x \(\frac { ds } { 3 }\)


  85. If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2, the length of the beam having nominal reinforcement, is

  86. A.

    4 cm

    B.

    6 m

    C.

    8 m

    D.

    10 m

    View Answer

    Workspace

    Discuss Discuss in Forum


  87. If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than

  88. A.

    4 mm

    B.

    5 mm

    C.

    6 mm

    D.

    8 mm

    E.

    10 mm

    View Answer

    Workspace

    Discuss Discuss in Forum


  89.  

    If the depth of actual neutral axis of a doubly reinforced beam

  90. A.

    is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier

    B.

    is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

    C.

    is equal to the depth of critical neutral axis, the concrete and steel attain their maximum stresses simultanesouly

    D.

    all the above.

    View Answer

    Workspace

    Discuss Discuss in Forum


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

  92. A.
    twice the diameter
    B.

    thrice the diameter

    C.

    four times the diameter

    D.

    five times the diameter

    E.

    seven times the diameter.

    View Answer

    Workspace

    Discuss Discuss in Forum


  93. A simply supported beam , 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is

  94. A.

    14 cm2

    B.
    15 cm2
    C.

    16 cm2

    D.

    17 cm2

    E.

    18 cm2

    View Answer

    Workspace

    Discuss Discuss in Forum


  95. If p1 is the vertical intensity of pressure at a depth h on a block of earth weighing w per unit volume and the angle of repose φ, the lateral intensity of pressure p2 is

  96. A.

    \(\frac { Wh (1-cosφ } { (1 +sinφ )}\)

    B.

    \(\frac { Wh (1-sinφ } { (1 +sinφ )}\)

    C.

    \(\frac { Wh (1-tanφ } { (1 +tanφ )}\)

    D.

    \(\frac { Wh (1-sinφ )} { h(1 +sinφ )}\)


  97. A pile of length L carrying a uniformly distributed load W per metre length is suspended at the centre and from other two points 0.15 L from either end ; the maximum hogging moment will be

  98. A.

    \(\frac { WL^2 } {15} \)

    B.

    \(\frac { WL^2 } {30} \)

    C.

    \(\frac { WL^2 } {60} \)

    D.

    \(\frac { WL^2 } {90} \)

    E.

    \(\frac { WL^2 } {120} \)


  99. Distribution of shear intensity over a rectangular section of a beam, follows :

  100. A.

    a circular curve

    B.

    a straight line

    C.

    a parabolic curve

    D.

    an elliptical curve

    E.

    an elliptical curve

    View Answer

    Workspace

    Discuss Discuss in Forum