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Civil Engineering :: RCC Structures Design

  1. After prestressing process is completed, a loss of stress is due to

  2. A.

    shrinkage of concrete

    B.
    elastic shortening of concrete
    C.

    creep of concrete

    D.

    creep of steel

    E.

    all the above.


  3. The minimum head room over a stair must be

  4. A.
    200 cm
    B.

    205 cm

    C.

    210 cm

    D.

    200 cm

    E.
    230 cm

  5. In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as

  6. A.

    a key

    B.
    a cut-off wall
    C.

    a rib

    D.

    all the above.


  7. The diameter of the column head support a flat slab, is generally kept

  8. A.
    0.25 times the span length
    B.

    0.25 times the diameter of the column

    C.

    4.0 cm larger than the diameter of the column

    D.
    5.0 cm larger than the diameter of the column
    E.

    none of these.


  9. The steel generally used in R.C.C. work, is

  10. A.
    stainless
    B.

    mildsteel

    C.

    high carbon steel

    D.

    high tension steel.


  11. Pick up the correct statement from the following:

  12. A.

    Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling

    B.

    Lateral reinforcement prevents the shearing of concrete on diagonal plane

    C.

    Lateral reinforcement stops breaking away of concrete cover, due to buckling

    D.

    Lateral reinforcement in R.C.C. columns, is kept not less than 5 mm diameter

    E.

    All the above.


  13. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is

  14. A.

    1400 kg/cm2

    B.

    190 kg/cm2

    C.

    260 kg/cm2

    D.
    230 kg/cm2

  15. If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

  16. A.

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

    B.

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

    C.

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

    D.

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

    E.

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


  17. If A is the sectional area of a prestressed rectangular beam provided with a tendon prestressed by a force P through its centroidal longitudinal axis, the compressive stress in concrete, is

  18. A.

    \(\frac { P} { A} \)

    B.

    \(\frac { A} { P} \)

    C.

    \(\frac { P} {2 A} \)

    D.

    \(\frac { 2A} { P} \)

    E.

    \(\frac { 3A} { P} \)


  19.  

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

  20. A.
    5 cm

     

    B.
    10 cm
    C.
    15 cm
    D.

    20 cm

    E.

    25 cm


  21. The self-weight of the footing, is

  22. A.

    not considered for calculating the upward pressure on footing

    B.
    also considered for calculating the upward pressure on footihg
    C.
    not considered for calculating the area of the footing
    D.

    both (b) and (c)


  23. For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed

  24. A.

    10

    B.

    15

    C.
    20
    D.

    25

    E.
    30

  25. If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept

  26. A.
    4.5 m
    B.
    4.0 m
    C.

    3.5 m

    D.

    3.5 m

    E.
    none of these.

  27. If Md and Mt are the maximum bending moments due to dead load and live load respectively and F is the total effective pressure, for a balanced design of a prestreseed concrete beam of steel, is

  28. A.

    e = \( \frac { Md } { F }\) + \( \frac { Mt } {2 F }\)

    B.

    e = \( \frac { Md } {2 F }\) + \( \frac { Ml } {F }\)

    C.

    e = \( \frac { Md } {2 F }\) + \( \frac { Ml } {3F }\)

    D.

    e = \( \frac { Ml } {3F }\) + \( \frac { Ml } {2F }\)


  29.  

    The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept

  30. A.

    0.7

    B.

    0.8

    C.
    0.9
    D.
    0.6
    E.

    none of these.


  31.  

    If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a superload on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

  32. A.

    \(\frac { p 1-p2} { 2 } \) h 

    B.

     h 

    C.

    \(\frac { p 1+p2} { 2 } \) h 

    D.

    (p1-p2)\(\frac { 2} { 3} \) h 


  33. Lapped splices in tensile reinforcement are generally not used for bars of size larger than

  34. A.

    18  mm diameter

    B.

    24 mm diameter

    C.

    30 mm diameter

    D.

    36 mm diameter

    E.
    32 mm diameter

  35. An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam

  36. A.
    is safe in shear
    B.
    is safe with stirrups
    C.

    is safe with stirrups and inclined bars

    D.

    needs revision of section


  37.  

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

  38. A.

    three times

    B.

    four times

    C.

    five times

    D.

    two times.


  39. The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.

  40. A.

    m = \(\frac { 700 } { 3c } \)

    B.

     m= \(\frac { 1400 } { 3c } \)

    C.

    m = \(\frac { 2800 } { 3c } \)

    D.

    m = \(\frac { 3500 } { 3c } \)

    E.

    m = \(\frac { 2300 } { 3c } \)


  41. In a prestressed member it is advisable to use

  42. A.
    low strength concrete only
    B.

    high strength concrete only

    C.

    low strength concrete but high tensile steel

    D.
    high strength concrete and high tensile steel
    E.

    high strength concrete but low tensile steel


  43.  

    The ratio of the breadth to effective depth of a beam is kept

  44. A.

    0.25

    B.

    0.50

    C.

    0.70

    D.

    0.75

    E.

    none of these.


  45. Spacing of stirrups in a rectangular beam, is

  46. A.
    kept constant throughout the length
    B.

    decreased towards the centre of the beam

    C.

    increased at the ends

    D.
    increased at the centre of the beam.

  47. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

  48. A.

    square

    B.

    rectangular

    C.

    trapezoidal

    D.
    triangular.

  49. For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is

  50. A.
    0.6
    B.
    0.7
    C.

    0.8

    D.

    0.9