MCQOPTIONS
Saved Bookmarks
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 formulae for load factor against cracking is ____________ |
| A. | Cracking moment/Working moment |
| B. | Cracking moment/Bending moment |
| C. | Cracking moment/Tensile moment |
| D. | Cracking moment/Aerial moment |
| Answer» B. Cracking moment/Bending moment | |
| 2. |
The widths of the cracks are influenced by ____________ |
| A. | Degree of bond |
| B. | Stress |
| C. | Strain |
| D. | Tension |
| Answer» B. Stress | |
| 3. |
The cracks appear when the tensile stresses at the soffit are equal to ____________ |
| A. | Modulus of elasticity |
| B. | Modulus of rupture |
| C. | Tension modulus |
| D. | Reinforcement modulus |
| Answer» C. Tension modulus | |
| 4. |
When the tensile stresses are developed in the cracks, they are visible at ____________ |
| A. | Hoop stress of beams |
| B. | Soffit of beams |
| C. | Sagging of beams |
| D. | Hogging of beams |
| Answer» C. Sagging of beams | |
| 5. |
A rectangular concrete beam of cross section 100mm wide and 400mm deep is prestressed by a straight cable of span 6m, imposed load is 3.14kn/m, area is 36 103mm2(Z=18 105mm3). Calculate working moment assuming the self weight of concrete as 24kn/m3? |
| A. | 10.25 |
| B. | 2.25 |
| C. | 3.25 |
| D. | 4.25 |
| Answer» B. 2.25 | |
| 6. |
A rectangular concrete beam of cross section 120mm wide and 300mm deep is prestressed by a straight cable, effective force of 180kn at an eccentricity 50, area of 36 103mm2(z=18 105mm3). Find the total stress due to prestress? |
| A. | 10 |
| B. | 25 |
| C. | 35 |
| D. | 45 |
| Answer» B. 25 | |
| 7. |
When the loads in a concrete member are further increased than permitted, the crack widths are of an order of limit? |
| A. | 0.01-0.02mm<sup>5</sup> |
| B. | 0.05-0.10mm<sup>5</sup> |
| C. | 0.03-0.05mm<sup>5</sup> |
| D. | 0.07-0.08mm<sup>5</sup> |
| Answer» B. 0.05-0.10mm<sup>5</sup> | |
| 8. |
The micro cracks develop as soon as the tensile strain in concrete exceeds about ____________ |
| A. | 80-100 10<sup>-6</sup> units |
| B. | 100-150 10<sup>-6</sup> units |
| C. | 150-300 10<sup>-6</sup> units |
| D. | 300-500 10<sup>-6</sup> units |
| Answer» B. 100-150 10<sup>-6</sup> units | |
| 9. |
The compressive and tensile stresses developed in cracking moments are due to ____________ |
| A. | Bending loads |
| B. | Transverse loads |
| C. | Tensile loads |
| D. | Compressive loads |
| Answer» C. Tensile loads | |
| 10. |
The soffit of the beam after the transfer of prestress to concrete will be under ____________ |
| A. | Tension |
| B. | Compression |
| C. | Breakage |
| D. | Bondage |
| Answer» C. Breakage | |