MCQOPTIONS
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MCQOPTIONS
This section includes 24 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. |
In a simply supported 9 m long beam, the effective depth should be a minimum of (approximately) d mm is required for assuming the vertical deflection to be satisfactory |
| A. | 1286 |
| B. | 346 |
| C. | 450 |
| D. | 600 |
| E. | 360 |
| Answer» D. 600 | |
| 2. |
For a two-way simply supported slab of shorter span (upto 3.5 m) with mild steel reinforcement. the span to overall depth is generally taken as: |
| A. | 35 |
| B. | 45 |
| C. | 40 |
| D. | 20 |
| E. | 25 |
| Answer» B. 45 | |
| 3. |
A singly reinforced rectangular concrete beam has a width of 150 mm and an effective depth of 330 mm. The characteristic compressive strength of concrete is 20 MPa and the tensile strength of steel is 415 MPa. Adopt the stress block for concrete as per IS 456-2000 and take the limiting value of depth of neutral axis as 0.48 times the effective depth of the beam for considering as a balanced section. What is the likely approximation for the limiting value of the moment of resistance of the beam? |
| A. | 15 kNm |
| B. | 25 kNm |
| C. | 45 kNm |
| D. | 75 kNm |
| Answer» D. 75 kNm | |
| 4. |
Lifting of the corners of slab is prevented by providing_______ reinforcement. |
| A. | torsion |
| B. | shear |
| C. | transverse |
| D. | longitudinal |
| Answer» B. shear | |
| 5. |
In beams the maximum area of the reinforcement in tension reinforcement shall not exceed |
| A. | 0.04 bD |
| B. | 0.02 bD |
| C. | 0.03 bD |
| D. | 0.01 bD |
| Answer» B. 0.02 bD | |
| 6. |
According to IS 456, two-way slabs with corners held down are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip is? |
| A. | half of the width of the slab |
| B. | two-third of the width of the slab |
| C. | three-fourth of the width of the slab |
| D. | four-fifth of the width of the slab |
| Answer» D. four-fifth of the width of the slab | |
| 7. |
If d is the effective depth, b is the width and D is the overall depth, then the maximum area of compression reinforcement in a beam is given by |
| A. | 0.04bd |
| B. | 0.04bD |
| C. | 0.12bd |
| D. | 0.12bD |
| E. | 0.04dD |
| Answer» C. 0.12bd | |
| 8. |
A beam of size 250 mm width and 460 mm effective depth is subjected to limit state moment of 146 kNm. If M 20 grade concrete and Fe 415 steel are used, the area of steel required will be |
| A. | 435 mm2 |
| B. | 935 mm2 |
| C. | 1100 mm2 |
| D. | 1235 mm2 |
| Answer» D. 1235 mm2 | |
| 9. |
Diagonal tension in beam _____ |
| A. | is maximum at neutral axis |
| B. | decreases below the neutral axis and increases above the neutral axis |
| C. | increases below the neutral axis and decreases above the neutral axis |
| D. | remains the same in both above and below the neutral axis |
| Answer» D. remains the same in both above and below the neutral axis | |
| 10. |
A simply supported beam having 200 mm width and 450 mm effective depth supports a total uniformly distributed load of 2,00,000 N. The nominal shear stress will be nearly |
| A. | 0.8 N/mm2 |
| B. | 1.1 N/mm2 |
| C. | 1.8 N/mm2 |
| D. | 2.2 N/mm2 |
| Answer» C. 1.8 N/mm2 | |
| 11. |
Fatigue in RCC beams will not be a problem if the number of cycles is less than |
| A. | 20,000 |
| B. | 25,000 |
| C. | 30,000 |
| D. | None of these |
| Answer» E. | |
| 12. |
Determine the slab area of which load is acting on supporting beams A and B |
| A. | 5.5 m2 and 7.0 m2 |
| B. | 4.0 m2 and 5.5 m2 |
| C. | 7.0 m2 and 4.0 m2 |
| D. | 4.0 m2 and 7.0 m2 |
| Answer» E. | |
| 13. |
Overall depth of T-beam for medium loading of continuous beams is assumed to be _______ of the total span. |
| A. | 1/12 to 1/15 |
| B. | 1/10 to 1/12 |
| C. | 1/15 to 1/20 |
| D. | 1/20 to 1/24 |
| Answer» B. 1/10 to 1/12 | |
| 14. |
A rectangular beam section of 300 mm width and 500 mm effective depth has tensile reinforcement of 1346 mm2. The beam M is constructed using M20 grade concrete and Fe 415 steel. Calculate the neutral axis. |
| A. | 225 mm |
| B. | 222 mm |
| C. | 135 mm |
| D. | 240 mm |
| Answer» B. 222 mm | |
| 15. |
If the span to effective depth ratio of a simply supported beam, for span upto 10 m, does not exceed ______, the vertical deflection limits may generally be satisfied. |
| A. | 30 |
| B. | 35 |
| C. | 20 |
| D. | 26 |
| Answer» D. 26 | |
| 16. |
Doubly reinforcement is provided in beam: |
| A. | All of the above |
| B. | To reduce deflection of beam only |
| C. | To reduce torsional moment only |
| D. | When depth of the section is restricted only |
| Answer» B. To reduce deflection of beam only | |
| 17. |
In the case of a continuous beam, if the width of the support is less than 1/12th of the clear span, then effective span shall be calculate as |
| A. | Centre to centre of support |
| B. | Clear span plus effective depth |
| C. | Clear span plus effective depth or centre to centre of support whichever is less |
| D. | Clear span plus effective depth or centre to centre of support whichever is more |
| Answer» D. Clear span plus effective depth or centre to centre of support whichever is more | |
| 18. |
In a singly reinforced balanced section, if M 30 concrete and Fe 415 steel is used, then the value of neutral axis factor (kumax) in L.S.M. is |
| A. | 0.42 |
| B. | 0.46 |
| C. | 0.48 |
| D. | 0.52 |
| Answer» D. 0.52 | |
| 19. |
If a 2-legged 8 mm diameter HYSD bar is used as shear reinforcement for a beam of with 230 mm and effective depth 300 mm, what is the nearest magnitude of the spacing of minimum shear reinforcement? |
| A. | 420 mm |
| B. | 390 mm |
| C. | 350 mm |
| D. | 320 mm |
| Answer» C. 350 mm | |
| 20. |
As per the stress block defined in IS 456-2000, the limiting depth of neutral axis in a flexural member having effective depth ‘d’ reinforced with Fe 550 grade steel in tension side is |
| A. | 0·48 d |
| B. | 0·53 d |
| C. | 0·42 d |
| D. | 0·44 d |
| Answer» E. | |
| 21. |
In Marcus's method of designing two way slabs, thickness of slab is generally taken to be _______ of shorter span. |
| A. | 1/10 |
| B. | 1/20 |
| C. | 1/30 |
| D. | 1/40 |
| Answer» D. 1/40 | |
| 22. |
In the design of singly reinforced simply supported beams, the maximum bending moment will be (Given W is the maximum load and L is the length): |
| A. | WI/64 |
| B. | W/8I2 |
| C. | WI2/8 |
| D. | WI2/32 |
| Answer» D. WI2/32 | |
| 23. |
In an under reinforced R.C.C beam section, the actual neutral axis fall ____ the critical neutral axis of the balanced section |
| A. | Below |
| B. | Above |
| C. | At |
| D. | None of the above |
| Answer» C. At | |
| 24. |
In the designs of Doubly Reinforced Beams, if actual neutral axis is greater than critical neutral axis, the section is: _______. |
| A. | Balanced |
| B. | Balanced or over reinforced |
| C. | Over reinforced |
| D. | Under reinforced |
| Answer» D. Under reinforced | |