The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as________________?

Related Mcqs:

1. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is___________________?

   A. 14 cm 2
   B. 15 cm2
   C. 16 cm2
   D. 17 cm2

2. Lapped splices in tensile reinforcement are generally not used for bars of size larger than______________?

   A. 18 mm diameter
   B. 24 mm diameter
   C. 30 mm diameter
   D. 36 mm diameter

3. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam_______________?

   A. Are curtailed if not required to resist the bending moment
   B. Are bent up at suitable places to serve as shear reinforcement
   C. Are bent down at suitable places to serve as shear reinforcement
   D. Are maintained at bottom to provide at least local bond stress

4. Steel bars are generally connected together to get greater length than the standard length by providing_______________?

   A. Straight bar splice
   B. Hooked splice
   C. Dowel splice
   D. All the above

5. The minimum number of main steel bars provided in R.C.C________________?

   A. Rectangular columns is 4
   B. Circular columns is 6
   C. Octagonal columns is 8
   D. All the above

6. A short column 20 cm × 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed_______________?

   A. 4120 kg
   B. 41,200 kg
   C. 412,000 kg
   D. None of these

7. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is__________________?

   A. 0.496 %

   B. 0.596 %

   C. 0.696 %

   D. 0.796 %

8. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is_______________?

   A. 1400 kg/cm2
   B. 190 kg/cm2
   C. 260 kg/cm2
   D. 230 kg/cm2

9. An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is__________________?

   A. 300 cm
   B. 233 cm
   C. 176 cm
   D. 236 cm

10. The pitch of the main bars in a simply supported slab, should not exceed its effective depth by_____________?

    A. Three times
    B. Four times
    C. Five times
    D. Six times