MCQOPTIONS
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MCQOPTIONS
This section includes 21 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 prestressed concrete beam, 200mm wide and 300mm deep is prestressed with wires (area is 320mm2) located at a constant eccentricity of 50mm, initial stress of 1000n/mm2, span is 10m. Calculate loss of stress due to friction and slip anchorage of post tensioned beam?(Es = 210kn/mm2, Ec = 35kn/mm2). |
| A. | 21 and 15 |
| B. | 35 and 25 |
| C. | 15 and 20 |
| D. | 5 and 10 |
| Answer» B. 35 and 25 | |
| 2. |
The total losses of stress that could be encountered under normal conditions of work were recommended by __________ |
| A. | Lin |
| B. | Marks |
| C. | Keifer |
| D. | Neville |
| Answer» B. Marks | |
| 3. |
A post tensioned cable of beam 10m long is initially tensioned to a stress of 1000n/mm2 at one end, slope is 1 in 24 tendons curved at each end , area is 600mm2, Es is 210kn/mm2, coefficient of friction between duct and cable is 0.55, friction coefficient for wave effect is 0.0015perm. During anchorage, if there is a slip 3mm at the jacking end, calculate final force? |
| A. | 39.8kn |
| B. | 40.2kn |
| C. | 37.8kn |
| D. | 48.8kn |
| Answer» D. 48.8kn | |
| 4. |
A concrete beam is post tensioned by a cable carrying an initial stress of 1000n/mm2, the slip at the jacking end was end was observed to be 5mm; modulus of elasticity of steel is 210kn/mm2. Estimate the percentage loss of stress due to anchorage if length of beam is 30m? |
| A. | 3.5% |
| B. | 4.5% |
| C. | 5.5% |
| D. | 8.7% |
| Answer» B. 4.5% | |
| 5. |
The loss of stress due to anchorage slip of anchorages is given as __________ |
| A. | EsA/L |
| B. | EaA/L |
| C. | EcA/L |
| D. | EwA/L |
| Answer» B. EaA/L | |
| 6. |
In case of long line pre tensioning system, anchorage slip is less than __________ |
| A. | Magnitude of wires |
| B. | Length of wires |
| C. | Distance of wires |
| D. | Radius of wires |
| Answer» C. Distance of wires | |
| 7. |
The anchorage slip is low in members with __________ |
| A. | Small spans |
| B. | Large spans |
| C. | Middle spans |
| D. | End spans |
| Answer» B. Large spans | |
| 8. |
The amount of anchorage slip generally depends upon __________ |
| A. | Type of wedge |
| B. | Type of tendon |
| C. | Type of anchor |
| D. | Type of cement |
| Answer» B. Type of tendon | |
| 9. |
The anchorage slip is observed in __________ |
| A. | Post tensioned members |
| B. | Pre tensioned members |
| C. | Anchorage members |
| D. | Tensioned members |
| Answer» C. Anchorage members | |
| 10. |
The term anchorage slip means ___________ |
| A. | Distance moved by friction wedges |
| B. | Radius by friction wedges |
| C. | Rotation by friction wedges |
| D. | Twisting movement by friction wedges |
| Answer» B. Radius by friction wedges | |
| 11. |
A_POST_TENSIONED_CABLE_OF_BEAM_10M_LONG_IS_INITIALLY_TENSIONED_TO_A_STRESS_OF_1000N/MM2_AT_ONE_END,_SLOPE_IS_1_IN_24_TENDONS_CURVED_AT_EACH_END_,_AREA_IS_600MM2,_ES_IS_210KN/MM2,_COEFFICIENT_OF_FRICTION_BETWEEN_DUCT_AND_CABLE_IS_0.55,_FRICTION_COEFFICIENT_FOR_WAVE_EFFECT_IS_0.0015PERM._DURING_ANCHORAGE,_IF_THERE_IS_A_SLIP_3MM_AT_THE_JACKING_END,_CALCULATE_FINAL_FORCE??$ |
| A. | 39.8kn |
| B. | 40.2kn |
| C. | 37.8kn |
| D. | 48.8kn |
| Answer» D. 48.8kn | |
| 12. |
A prestressed concrete beam, 200mm wide and 300mm deep is prestressed with wires (area is 320mm2) located at a constant eccentricity of 50mm, initial stress of 1000n/mm2, span is 10m. Calculate loss of stress due to friction and slip anchorage of post tensioned beam?(Es = 210kn/mm2, Ec = 35kn/mm2)$ |
| A. | 21 and 15 |
| B. | 35 and 25 |
| C. | 15 and 20 |
| D. | 5 and 10 |
| Answer» B. 35 and 25 | |
| 13. |
The_total_losses_of_stress_that_could_be_encountered_under_normal_conditions_of_work_were_recommended_by:$ |
| A. | Lin |
| B. | Marks |
| C. | Keifer |
| D. | Neville |
| Answer» B. Marks | |
| 14. |
A concrete beam is post tensioned by a cable carrying an initial stress of 1000n/mm2, the slip at the jacking end was end was observed to be 5mm; modulus of elasticity of steel is 210kn/mm2. Estimate the percentage loss of stress due to anchorage if length of beam is 30m? |
| A. | 3.5% |
| B. | 4.5% |
| C. | 5.5% |
| D. | 8.7% |
| Answer» B. 4.5% | |
| 15. |
The loss of stress due to anchorage slip of anchorages is given as: |
| A. | E<sub>s</sub>A/L |
| B. | E<sub>a</sub>A/L |
| C. | E<sub>c</sub>A/L |
| D. | E<sub>w</sub>A/L |
| Answer» B. E<sub>a</sub>A/L | |
| 16. |
Which of the following system is similar to loss due to anchorage slip? |
| A. | Freyssinet system |
| B. | Magnel Balton system |
| C. | Leonhardt-Baur system |
| D. | Gifford Udall system |
| Answer» D. Gifford Udall system | |
| 17. |
In case of long line pre tensioning system, anchorage slip is less than: |
| A. | Magnitude of wires |
| B. | Length of wires |
| C. | Distance of wires |
| D. | Radius of wires |
| Answer» C. Distance of wires | |
| 18. |
The anchorage slip is low in members with: |
| A. | Small spans |
| B. | Large spans |
| C. | Middle spans |
| D. | End spans |
| Answer» B. Large spans | |
| 19. |
The amount of anchorage slip generally depends upon: |
| A. | Type of wedge |
| B. | Type of tendon |
| C. | Type of anchor |
| D. | Type of cement |
| Answer» B. Type of tendon | |
| 20. |
The anchorage slip is observed in: |
| A. | Post tensioned members |
| B. | Pre tensioned members |
| C. | Anchorage members |
| D. | Tensioned members |
| Answer» B. Pre tensioned members | |
| 21. |
The term anchorage slip means: |
| A. | Distance moved by friction wedges |
| B. | Radius by friction wedges |
| C. | Rotation by friction wedges |
| D. | Twisting movement by friction wedges |
| Answer» B. Radius by friction wedges | |