MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Irrigation Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The shear stress required to move grain on the side slopes is less than the shear stress required to move the grain on the canal bed. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Determine the shear stress required to move the single grain on the side slopes, if the critical shear stress required moving the similar grain on the horizontal bed is 2.91 N/m2. Consider the angle of the side slope with the horizontal as 30° and the angle of repose of soil as 37°. |
| A. | 1.61 N/m2 |
| B. | 2.61 N/m2 |
| C. | 2.91 N/m2 |
| D. | 1.00 N/m2 |
| Answer» B. 2.61 N/m2 | |
| 3. |
Calculate the ratio of the tractive critical stress to the average shear stress if the water flows at a depth of 0.8 m in a wide stream having a bed slope of 1 in 3000. The median diameter of the sand bed is 2 mm. |
| A. | 0.53 |
| B. | 1.86 |
| C. | 0.86 |
| D. | 1.53 |
| Answer» B. 1.86 | |
| 4. |
Calculate the critical tractive stress if the median diameter of the sand bed is 1.0 mm. |
| A. | 0.53 N/m2 |
| B. | 0.61 N/m2 |
| C. | 0.73 N/m2 |
| D. | 1.61 N/m2 |
| Answer» B. 0.61 N/m2 | |
| 5. |
The manning’s coefficient for a lined trapezoidal channel with a bed slope of 1 in 4000 is 0.014 and it will be 0.028 if the channel is unlined. The area in the case of the lined section is 19.04 m2 and for the unlined section is 29.09 m2. What percentage of earthwork is saved in a lined section relative to an unlined section, when a hydraulically efficient section is used in both the cases? |
| A. | 24.44 % |
| B. | 34.55% |
| C. | 50% |
| D. | 37.66% |
| Answer» C. 50% | |
| 6. |
Calculate the Manning’s rugosity coefficient in a coarse alluvium gravel with D-75 size of 5 cm. |
| A. | 0.025 m |
| B. | 0.035 m |
| C. | 0.055 m |
| D. | 0.1 m |
| Answer» B. 0.035 m | |
| 7. |
What is the limitation of the Shield’s expression? |
| A. | It can be used when the diameter of a particle (d) is < 6mm and Reynold’s number > 400 |
| B. | It can be used only when Reynold’s number > 400 |
| C. | It can be used only when the diameter of the particle is < 6 mm |
| D. | is < 6mm and Reynold’s number > 400b) It can be used only when Reynold’s number > 400c) It can be used only when the diameter of the particle is < 6 mmd) It can be used when the diameter of a particle is > 6mm and Reynold’s number > 400 |
| Answer» E. | |
| 8. |
What is the minimum size of the bed material that will remain at rest in a channel? |
| A. | d > or = 11 R.S |
| B. | d < or = 11 R.S |
| C. | d = 11 R.S |
| D. | d > 11 R.S |
| Answer» B. d < or = 11 R.S | |
| 9. |
Strickler’s formula is only applicable to the flexible boundary channels. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
For the design of non-scouring channels in coarse alluviums, the shield’s entrainment function should be ____________ |
| A. | Fs > 0.056 |
| B. | Fs < 0.056 |
| C. | Fs = 0.056 |
| D. | Fs = 0 |
| Answer» D. Fs = 0 | |
| 11. |
Which one is the correct expression for Shield’s entrainment function? |
| A. | Tc / Yw. d. (Gs – 1) |
| B. | Tc.Yw / d. (Gs – 1) |
| C. | Tc / Yw. d |
| D. | Tc .Yw. d / (Gs – 1) |
| Answer» B. Tc.Yw / d. (Gs – 1) | |
| 12. |
Whose theory was the first to provide semi-theoretical analysis of the problem of incipient condition of bed motion? |
| A. | Lacey’s theory |
| B. | Kennedy’s theory |
| C. | Shield’s theory |
| D. | Strickler’s equation |
| Answer» D. Strickler’s equation | |