Home / Civil Engineering / Concrete Technology and Design of Concrete Structures :: Section-4

Civil Engineering :: Concrete Technology and Design of Concrete Structures

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

  2. A.

     wholly parabolic

    B.

     wholly rectangular

    C.

     parabolic above neutral axis and rectangular below neutral axis

    D.

     rectangular above neutral axis and parabolic below neutral axis

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. In prestressed concrete

  4. A.

     forces of tension and compression change but lever arm remains unchanged

    B.

     forces of tension and compressions remain unchanged but lever arm changes with the moment

    C.

     both forces of tension and compres-sion as well as lever arm change

    D.

     both forces of tension and compres-sion as well as lever arm remain unchanged

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

  6. A.

     Deflect downward

    B.

     Deflect upward

    C.

     Deflect downward or upward

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

  8. A.

     0.367 xu

    B.

     0.416 xu

    C.

     0.446 xu

    D.

     0.573 xu

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Examine the following statements :
    i) Factor of safety for steel should be based on its yield stress,
    ii) Factor of safety for steel should be based on its ultimate stress,
    iii) Factor of safety for concrete should be based on its yield stress,
    iv) Factor of safety for concrete should be based on its ultimate stress.
    The correct statements are

  10. A.

     (i) and (iii)

    B.

     (i) and (iv)

    C.

     (ii) and (iii)

    D.

     (ii) and (iv)

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. Strength of concrete increases with

  12. A.

     increase in water-cement ratio

    B.

     increase in fineness of cement

    C.

     decrease in curing time

    D.

     decrease in size of aggregate

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. In counterfort retaining walls, the main reinforcement in the stem at support is

  14. A.

     Not provided

    B.

     Provided only on inner face

    C.

     Provided only on front face

    D.

     Provided both on inner and front faces

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Assertion A : The load factor for live load is greater than that for dead load.
    Reason R : The live loads are more uncertain than dead loads.
    Select your answer based on the coding system given below :

  16. A.

     Both A and R are true and R is the correct explanation of A.

    B.

     Both A and R are true but R is not the correct explanation of A.

    C.

     A is true but R is false.

    D.

     A is false but R is true.

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Diagonal tension in a beam

  18. A.

     Is maximum at neutral axis

    B.

     Decreases below the neutral axis and increases above the neutral axis

    C.

     Increases below the neutral axis and decreases above the neutral axis

    D.

     Remains same

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. According to IS : 456-1978, the fiexural strength of concrete is

  20. A.

     directly proportional to compressive strength

    B.

     inversely proportional to compressive strength

    C.

     directly proportional to square root of compressive strength

    D.

     inversely proportional to square root of compressive strength

    View Answer

    Workspace

    Discuss Discuss in Forum