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### Civil Engineering :: Concrete Technology and Design of Concrete Structures

1. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

2.  A.  compressive and tensile B.  tensile and compressive C.  both compressive D.  both tensile

3. Critical section for shear in case of flat slabs is at a distance of

4.  A.  effective depth of slab from periphery of column/drop panel B.  d/2 from periphery of column/capital/ drop panel C.  at the drop panel of slab D.  at the periphery of column

5. 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

6.  A.  depends on as, only B.  depends on aCbC only C.  depends on both crst and acbc D.  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.

7. The diameter of ties in a column should be

8.  A.  More than or equal to one fourth of diameter of main bar B.  More than or equal to 5 mm C.  More than 5 mm but less than one-fourth of diameter of main bar D.  More than 5 mm and also more than one-fourth of diameter of main bar

9. Bulking of sand is maximum if moisture content is about

10.  A.  2 % B.  4 % C.  6 % D.  10 %

11. If a beam fails in bond, then its bond strength can be increased most economi-cally by

12.  A.  increasing the depth of beam B.  using thinner bars but more in number C.  using thicker bars but less in number D.  providing vertical stirrups

13. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

14.  A.  0.75 - 0.80 B.  0.80 - 0.85 C.  0.85 - 0.92 D.  Above 0.92

15. Ultimate strength of cold drawn high steel wires

16.  A.  increases with increase in diameter of bar B.  decreases with increase in diameter of bar C.  does not depend on diameter of bar D.  none of the above

17. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

18.  A.  10% B.  20% C.  30% D.  40%

19. The percentage of voids in cement is approximately

20.  A.  25% B.  40% C.  60% D.  80%