MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
A pre tensioned beam is prestressed using 5mm diameter wires with an initial stress of 80 percent of the ultimate strength of steel fpu = 1600n/mm2. Calculate average bond stress? |
| A. | 4.20n/mm2 |
| B. | 3.30n/mm2 |
| C. | 2.0n/mm2 |
| D. | 4.9n/mm2 |
| Answer» C. 2.0n/mm2 | |
| 2. |
A pretensioned beam is prestressed using 5mm diameter wires, τ bp = 7.42, ϕ = 0.00725, Lt = 485mm. Calculate the bond stress at l/4 and l/2 the transmission length from the end? |
| A. | 3.7n/mm2 and 1.82n/mm2 |
| B. | 2.2n/mm2 and 5.8n/mm2 |
| C. | 4.8n/mm2 and 10.5n/mm2 |
| D. | 1.5n/mm2 and 7.4n/mm2 |
| Answer» B. 2.2n/mm2 and 5.8n/mm2 | |
| 3. |
A pre tensioned beam is prestressed with the cube strength of concrete at transfer is 30n/mm2 (β = 0.0235) calculate the transmission length? |
| A. | 645mm |
| B. | 1100mm |
| C. | 485mm |
| D. | 1600mm |
| Answer» D. 1600mm | |
| 4. |
The prestressing force of 90 to 95 percent is obtained at about ____________ |
| A. | Half of the transmission length |
| B. | Three fourth of transmission length |
| C. | Four third of transmission length |
| D. | 1.5 of transmission length |
| Answer» C. Four third of transmission length | |
| 5. |
The stress in a steel wire gradually increases from zero to the ____________ |
| A. | Middle |
| B. | Bottom |
| C. | End |
| D. | Top |
| Answer» D. Top | |
| 6. |
The magnitude of the average bond stress compared to the maximum local bond stress is considerably ____________ |
| A. | Less |
| B. | More |
| C. | Zero |
| D. | Constant |
| Answer» B. More | |
| 7. |
According to Marshall the wires of 2 and 5mm diameter are stressed to ____________ |
| A. | 1500 and 1700n/mm2 |
| B. | 1575 and 1100n/mm2 |
| C. | 1400 and 1800n/mm2 |
| D. | 1250 and 1600n/mm2 |
| Answer» C. 1400 and 1800n/mm2 | |
| 8. |
The relations proposed by Marshall for bond stress are given as ____________ |
| A. | (τ bp)x = (τ bp)maxe-4ψx/ϕ |
| B. | (τ bp)x = (τ bp)maxe-4ψx |
| C. | (τ bp)x = (τ bp)maxe-4ψ |
| D. | (τ bp)x = (τ bp)maxe-4 |
| Answer» B. (τ bp)x = (τ bp)maxe-4ψx | |
| 9. |
The bond stress is zero at the distance equal to the ____________ |
| A. | Tensile length |
| B. | Span length |
| C. | Transmission length |
| D. | Anchorage length |
| Answer» D. Anchorage length | |
| 10. |
The magnitude of bond stresses is developed between ____________ |
| A. | Concrete and steel |
| B. | Aggregates and steel |
| C. | Water and steel |
| D. | Bricks and steel |
| Answer» B. Aggregates and steel | |
| 11. |
A_PRETENSIONED_BEAM_IS_PRESTRESSED_USING_5MM_DIAMETER_WIRES,_‚ÂÀ√¨‚ÀÖ√´_BP_=_7.42,_‚ÂÀ√¨‚ÀÖ√Ò_=_0.00725,_LT_=_485MM._CALCULATE_THE_BOND_STRESS_AT_L/4_AND_L/2_THE_TRANSMISSION_LENGTH_FROM_THE_END??$# |
| A. | 3.7n/mm<sup>2</sup> and 1.82n/mm<sup>2</sup> |
| B. | 2.2n/mm<sup>2</sup> and 5.8n/mm<sup>2</sup> |
| C. | 4.8n/mm<sup>2</sup> and 10.5n/mm<sup>2</sup> |
| D. | 1.5n/mm<sup>2</sup> and 7.4n/mm<sup>2</sup> |
| Answer» B. 2.2n/mm<sup>2</sup> and 5.8n/mm<sup>2</sup> | |
| 12. |
A pre tensioned beam is prestressed using 5mm diameter wires with an initial stress of 80 percent of the ultimate strength of steel fpu = 1600n/mm2. Calculate average bond stress?$ |
| A. | 4.20n/mm<sup>2</sup> |
| B. | 3.30n/mm<sup>2</sup> |
| C. | 2.0n/mm<sup>2</sup> |
| D. | 4.9n/mm<sup>2</sup> |
| Answer» C. 2.0n/mm<sup>2</sup> | |
| 13. |
A pre tensioned beam is prestressed with the cube strength of concrete at transfer is 30n/mm2 (β = 0.0235) calculate the transmission length?# |
| A. | 645mm |
| B. | 1100mm |
| C. | 485mm |
| D. | 1600mm |
| Answer» D. 1600mm | |
| 14. |
The prestressing force of 90 to 95 percent is obtained at about: |
| A. | Half of transmission length |
| B. | Three fourth of transmission length |
| C. | Four third of transmission length |
| D. | 1.5 of transmission length |
| Answer» C. Four third of transmission length | |
| 15. |
The stress in a steel wire gradually increases from zero to the: |
| A. | Middle |
| B. | Bottom |
| C. | End |
| D. | Top |
| Answer» D. Top | |
| 16. |
The magnitude of the average bond stress compared to the maximum local bond stress is considerably: |
| A. | Less |
| B. | More |
| C. | Zero |
| D. | Constant |
| Answer» B. More | |
| 17. |
According to Marshall the wires of 2 and 5mm diameter are stressed to: |
| A. | 1500 and 1700n/mm<sup>2</sup> |
| B. | 1575 and 1100n/mm<sup>2</sup> |
| C. | 1400 and 1800n/mm<sup>2</sup> |
| D. | 1250 and 1600n/mm<sup>2</sup> |
| Answer» C. 1400 and 1800n/mm<sup>2</sup> | |
| 18. |
The relations proposed by Marshall for bond stress are given as: |
| A. | (τ <sub>bp</sub>)x = (τ <sub>bp</sub>)<sub>max</sub>e<sup>-4ψx/ϕ</sup> |
| B. | (τ <sub>bp</sub>)x = (τ <sub>bp</sub>)<sub>max</sub>e<sup>-4ψx</sup> |
| C. | (τ <sub>bp</sub>)x = (τ <sub>bp</sub>)<sub>max</sub>e<sup>-4ψ</sup> |
| D. | (τ <sub>bp</sub>)x = (τ <sub>bp</sub>)<sub>max</sub>e<sup>-4</sup> |
| Answer» B. (‚âà√¨‚àö√´ <sub>bp</sub>)x = (‚âà√¨‚àö√´ <sub>bp</sub>)<sub>max</sub>e<sup>-4‚âà√¨‚àö‚Ćx</sup> | |
| 19. |
The bond stress is zero at the distance equal to the: |
| A. | Tensile length |
| B. | Span length |
| C. | Transmission length |
| D. | Anchorage length |
| Answer» D. Anchorage length | |
| 20. |
The magnitude of bond stresses is developed between: |
| A. | Concrete and steel |
| B. | Aggregates and steel |
| C. | Water and steel |
| D. | Bricks and steel |
| Answer» B. Aggregates and steel | |