Concrete Technology And Design Of Concrete Structures(Civil Engineering ) Questions and Answers

Question 1. The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)
  1.    wR / 4d
  2.    wR/2d
  3.    wR/d
  4.    2wR/d
Explanation:-
Answer: Option B. -> wR/2d
Question 2. Stress strain curve of high tensile steel
  1.    Has a definite yield point
  2.    Does not show definite yield point but yield point is defined by 0.1% proof stress
  3.    Does not show definite yield point but yield point is defined by 0.2% proof stress
  4.    Does not show definite yield point but yield point is defined by 2% proof stress
Explanation:-
Answer: Option C. -> Does not show definite yield point but yield point is defined by 0.2% proof stress
Question 3. For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is
  1.    50 mm
  2.    75 mm
  3.    100 mm
  4.    120 mm
Explanation:-
Answer: Option B. -> 75 mm
Question 4. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
  1.    Zero
  2.    Tensile
  3.    Compressive
  4.    Tensile or compressive
Explanation:-
Answer: Option C. -> Compressive
Question 5. While designing the pile as a column, the end conditions are nearly
  1.    Both ends hinged
  2.    Both ends fixed
  3.    One end fixed and other end hinged
  4.    One end fixed and other end free
Explanation:-
Answer: Option C. -> One end fixed and other end hinged
Question 6. 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
  1.    depends on as, only
  2.    depends on aCbC only
  3.    depends on both crst and acbc
  4.    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.
Explanation:-
Answer: Option A. -> depends on as, only
Question 7. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively
  1.    Compressive and tensile
  2.    Tensile and compressive
  3.    Both compressive
  4.    Both tensile
Explanation:-
Answer: Option B. -> Tensile and compressive
Question 8. The diameter of ties in a column should be
  1.    More than or equal to one fourth of diameter of main bar
  2.    More than or equal to 5 mm
  3.    More than 5 mm but less than one-fourth of diameter of main bar
  4.    More than 5 mm and also more than one-fourth of diameter of main bar
Explanation:-
Answer: Option D. -> More than 5 mm and also more than one-fourth of diameter of main bar
Question 9. Bulking of sand is maximum if moisture content is about
  1.    2%
  2.    4%
  3.    6%
  4.    10%
Explanation:-
Answer: Option B. -> 4%
Question 10. Critical section for shear in case of flat slabs is (adopting standard notations)
  1.    At a distance of effective depth of slab from periphery of column/drop panel
  2.    At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel
  3.    At the drop panel of slab
  4.    At the periphery of column
Explanation:-
Answer: Option B. -> At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel
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