Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

Related Mcqs:

1. Prestress loss due to friction occurs________________?

   A. only in post-tensioned beams
   B. only in pretensioned beams
   C. in both post-tensioned and preten-sioned beams
   D. none of the above

2. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?

   A. 35 MPa and 42 MPa
   B. 42 MPa and 35 MPa
   C. 42 MPa and 53 MPa
   D. 53 MPa and 42 MPa

3. Which of the following statements is incorrect ?

   A. Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%
   B. Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm
   C. Reinforcing bars in a column should not be less than 12 mm in diameter
   D. The number of longitudinal bars provided in a circular column should not be less than four

4. Which of the following R.C. retaining walls is suitable for heights beyond 6m ?

   A. L-shaped wall
   B. T-shaped wall
   C. counterfort type
   D. all of the above

5. Which of the following has high tensile strength ?

   A. plain hot rolled wires
   B. cold drawn wires
   C. heat treated rolled wires
   D. all have same tensile strength

6. Examine the following statements ___________?

   1. Factor of safety for steel should be based on its yield stress,
   2. Factor of safety for steel should be based on its ultimate stress,
   3. Factor of safety for concrete should be based on its yield stress,
   4. Factor of safety for concrete should be based on its ultimate stress.
   The correct statements are

   A. (1) and (3)
   B. (1) and(4)
   C. (2) and (3)
   D. (2) and (4)

7. Workability of concrete is directly proportional to________________?

   A. aggregate cement ratio
   B. time of transit
   C. grading of the aggregate
   D. all of above

8. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________?

   A. 0.75-0.80
   B. 0.80-0.85
   C. 0.85 – 0.92
   D. above 0.92

9. Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to________________?

   A. 1/3
   B. 1/5
   C. 1/7
   D. 1/10
   where 1 is the span

10. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of__________________?

    A. 0.367 xu
    B. 0.416 xu
    C. 0.446 xu
    D. 0.573 xu

    where xu is the depth of neutral axis at the limit state of collapse