MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Prestressed Concrete Structures knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The loss of stress due to successive tensioning of curved cables in elastic deformation of concrete is estimated by considering ___________ |
| A. | Initial stress |
| B. | Average stress |
| C. | Bondage stress |
| D. | Anchorage stress |
| Answer» C. Bondage stress | |
| 2. |
A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm2, initial stress of 1200n/mm2. Calculate the stress in concrete at level of steel? |
| A. | 2.4n/mm<sup>2</sup> |
| B. | 2.0n/mm<sup>2</sup> |
| C. | 2.7n/mm<sup>2</sup> |
| D. | 1.5n/mm<sup>2</sup> |
| Answer» D. 1.5n/mm<sup>2</sup> | |
| 3. |
A rectangular concrete beam 360mm deep and 200mm wide, is prestressed by means of fifteen 5mm diameter wires located 65mm from the bottom of the beam and three 5mm wires, located 275mm from top of the beam, initial tension stress is 840n/mm2. Calculate prestressing force? |
| A. | 504 10<sup>2</sup>kn |
| B. | 500 10<sup>2</sup>kn |
| C. | 620 10<sup>2</sup>kn |
| D. | 400 10<sup>2</sup>kn |
| Answer» B. 500 10<sup>2</sup>kn | |
| 4. |
A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kn at an eccentricity of 50mm, moment of inertia is 225 106mm4, initial stress in steel is 400n/mm2, modular ratio is 8. Estimate the percentage loss? |
| A. | 10% |
| B. | 5% |
| C. | 14% |
| D. | 20% |
| Answer» D. 20% | |
| 5. |
A pretensioned concrete beam 200mm wide and 300mm deep, is prestressed by straight wires carrying an initial force of 150kn at eccentricity of 50mm, area of steel wires is 188mm2. Find initial stress in steel? |
| A. | 1400 |
| B. | 800 |
| C. | 200 |
| D. | 100 |
| Answer» C. 200 | |
| 6. |
A pretensioned concrete beam, 100mm wide and 300mm deep in prestressed by straight wires and modulus of elasticity of steel and concrete are 210 and 35n/mm2. Find modular ratio? |
| A. | 14 |
| B. | 7 |
| C. | 6 |
| D. | 10 |
| Answer» D. 10 | |
| 7. |
The loss of stress in steel due to elastic shortening or deformation is ____________ |
| A. | <sub>e</sub>f<sub>c</sub> |
| B. | <sub>c</sub>f<sub>c</sub> |
| C. | <sub>c</sub>/f<sub>c</sub> |
| D. | <sub>e</sub>/f<sub>c</sub> |
| Answer» B. <sub>c</sub>f<sub>c</sub> | |
| 8. |
The term Es in losses developed by elastic deformation is defined as ____________ |
| A. | Shear in steel |
| B. | Torsion in steel |
| C. | Strain loss in steel |
| D. | Loading in steel |
| Answer» D. Loading in steel | |
| 9. |
The term Ec in losses developed by elastic deformation is expressed as ____________ |
| A. | P<sub>e</sub>/A |
| B. | P<sub>c</sub>/E<sub>a</sub> |
| C. | P/A<sub>c</sub>E<sub>c</sub> |
| D. | E<sub>a</sub>/E<sub>l</sub> |
| Answer» D. E<sub>a</sub>/E<sub>l</sub> | |
| 10. |
The loss of prestress due to elastic deformation of concrete depends on ____________ |
| A. | Modular ratio and average stress |
| B. | Modular elasticity and shear |
| C. | Prestress in concrete |
| D. | Modulus of elasticity of steel |
| Answer» B. Modular elasticity and shear | |