MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 62 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. |
By considering the channel index as \(\frac{5}{3},\) the setting of an orifice type irrigation outlet to have proportionality is |
| A. | 0.9 |
| B. | 0.67 |
| C. | 0.3 |
| D. | 1.15 |
| Answer» D. 1.15 | |
| 2. |
A channel designed by Lacey’s theory has a velocity of 0.88 m / sec. The silt factor is 1.1. Then hydraulic mean depth will be |
| A. | 1.95 m |
| B. | 1.76 m |
| C. | 1.63 m |
| D. | 1.50 m |
| Answer» C. 1.63 m | |
| 3. |
For calculating the maximum flood discharge in an alluvial stream, which is the best-suited relation? |
| A. | V ∝ R2/3 S1/3 |
| B. | V ∝ R2/3 S1/2 |
| C. | V ∝ R1/2 S1/2 |
| D. | V ∝ D0.64 |
| Answer» B. V ∝ R2/3 S1/2 | |
| 4. |
A ridge canal is called a: |
| A. | Across the contours |
| B. | Contour canal |
| C. | Side slope canal |
| D. | Watershed canal |
| Answer» E. | |
| 5. |
Pick up the correct sequence of the part of a canal system from the following. |
| A. | Head work-distributary-branch canal-minor |
| B. | Head works-main canal-branch canal-distributary-minor |
| C. | Head works-main canal-branch canal-minor-distributary |
| D. | Head works-branch canal-main canal distributary, minor |
| Answer» C. Head works-main canal-branch canal-minor-distributary | |
| 6. |
A canal fall is a control structure |
| A. | Located at a place where the country slope is flatter than the canal bed slope |
| B. | Located most economically where the depth of cutting is less than the balancing depth |
| C. | The location of which is independent of the command to be served |
| D. | Designed to secure raising of water surface on its upstream |
| Answer» C. The location of which is independent of the command to be served | |
| 7. |
Consider the following data while designing an expansion transition for a canal by Mitra's method:Length of flume = 16 mWidth of throat = 9 mWidth of canal = 15 mIf Bx is the width at any distance x from the filmed section, the values of Bx at x = 8 mand at x = 16 m are nearly |
| A. | 10.8 m and 1.5 m |
| B. | 11.3 m and 15 m |
| C. | 10.8 m and 1.3 m |
| D. | 11.3 m and 1.3 m |
| Answer» C. 10.8 m and 1.3 m | |
| 8. |
Canal normally used for diversion of flood water of a river is ______. |
| A. | Feeder canal |
| B. | Inundation canal |
| C. | Ridge canal |
| D. | Contour canal |
| Answer» C. Ridge canal | |
| 9. |
Consider the following statements regarding design of channel by Lacey and Kennedy:1. The theoretical concept of silt transportation is the same in both the theories.2. Lacey improved upon Kennedy’s formula.3. There are no defects in either the theories of Lacey or of Kennedy.Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 10. |
In a Lacey regime channel:1. The bed load is zero.2. The suspended load is zero.3. The bed slope is a function of the full supply discharge and the silt size.Which of the above statements is / are correct? |
| A. | 1 and 2 |
| B. | 3 only |
| C. | 2 and 3 |
| D. | 2 only |
| Answer» C. 2 and 3 | |
| 11. |
For a discharge of 2.01 m3/s and silt factor f=0.85 using Lacey's theory, the velocity is |
| A. | 0.467 m/s |
| B. | 2.567 m/s |
| C. | 4.667 m/s |
| D. | 6.777 m/s |
| Answer» B. 2.567 m/s | |
| 12. |
It is expected that due to extreme cold weather, the entire top surface of canal carrying water will be covered with ice sheet for some days. If the discharge in the canal were to remain unaltered, this condition would lead to |
| A. | No change in the depth of flow |
| B. | Decrease in the depth of flow |
| C. | Gradually decreasing flow |
| D. | Increase in the depth of flow |
| Answer» E. | |
| 13. |
Cross regulators in main canals is providing to: |
| A. | Regulate the water supply in the distributaries. |
| B. | Increase the water head upstream when a main canals is running with low supplies. |
| C. | Overflow excessive flow water. |
| D. | None of the above |
| Answer» C. Overflow excessive flow water. | |
| 14. |
A channel designed by Lacey’s theory has a mean velocity of one m/s. The silt factor is unity. The hydraulic mean radius will be |
| A. | 2.5 m |
| B. | 2.0 m |
| C. | 1.0 m |
| D. | 0.5 m |
| Answer» B. 2.0 m | |
| 15. |
According to Lacey's Silt theory perimeter P of a channel is proportional to - |
| A. | Q0.8 |
| B. | Q1/2 |
| C. | Q2/5 |
| D. | Q |
| Answer» C. Q2/5 | |
| 16. |
For the design of lined canal, the formula commonly used is |
| A. | Kennedy’s formula |
| B. | Lacey’s formula |
| C. | Manning’s formula |
| D. | Lindley’s formula |
| Answer» D. Lindley’s formula | |
| 17. |
Critical Velocity Ratio is defined as the: |
| A. | Ratio of actual mean velocity (V) to the critical velocity (Vo ) given by Kennedy formula |
| B. | Ratio of critical velocity (Vo ) given by Kennedy formula to the actual mean velocity (V) |
| C. | Ratio of actual mean velocity (V) to the critical velocity (Vo ) given by Lacey formula |
| D. | Ratio of critical velocity (Vo ) given by Lacey formula to the actual mean velocity (V) |
| Answer» B. Ratio of critical velocity (Vo ) given by Kennedy formula to the actual mean velocity (V) | |
| 18. |
A super passage is: |
| A. | When canal is passing over the drainage |
| B. | When canal is below the drainage |
| C. | When the drain is passing the canal |
| D. | All of the above |
| Answer» C. When the drain is passing the canal | |
| 19. |
A drop in canal bed is generally provided if: |
| A. | Ground slope exceeds designed bed slope |
| B. | Design bed slope exceeds ground slope |
| C. | Ground slope is same as designed bed slope |
| D. | None of these |
| Answer» B. Design bed slope exceeds ground slope | |
| 20. |
Lacey gave V – Q – f relation as: |
| A. | \({\rm{V}} = {\left[ {\frac{{{\rm{Q}}{{\rm{f}}^2}}}{{160}}} \right]^{\frac{1}{4}}}\) |
| B. | \({\rm{V}} = {\left[ {\frac{{{\rm{Q}}{{\rm{f}}^2}}}{{140}}} \right]^{\frac{1}{6}}}\) |
| C. | \({\rm{V}} = {\left[ {\frac{{{\rm{f}}{{\rm{Q}}^2}}}{{160}}} \right]^{\frac{1}{4}}}\) |
| D. | \({\rm{V}} = {\left[ {\frac{{{\rm{Qf}}}}{{140}}} \right]^{\frac{1}{6}}}\) |
| Answer» C. \({\rm{V}} = {\left[ {\frac{{{\rm{f}}{{\rm{Q}}^2}}}{{160}}} \right]^{\frac{1}{4}}}\) | |
| 21. |
Hydraulic mean depth of a canal is the ratio between |
| A. | Area of flow section and top water surface width |
| B. | Area of flow section and the wetted perimeter |
| C. | Total cross sectional area and top water surface width |
| D. | Total cross sectional area and the wetted perimeter |
| Answer» B. Area of flow section and the wetted perimeter | |
| 22. |
In Bligh Creep Theory [L/H] is called as: |
| A. | Creep Length |
| B. | Hydraulic Gradient |
| C. | Coefficient of Creep |
| D. | Percolation Coefficient |
| Answer» D. Percolation Coefficient | |
| 23. |
According to Lacey’s theory, the silt supporting eddies are generated from |
| A. | Bottom or channel only |
| B. | Sides of the channel only |
| C. | Bottom as well as side of channel |
| D. | None of the above |
| Answer» D. None of the above | |
| 24. |
Garret's diagrams are based on |
| A. | Lacey's theory |
| B. | Khosla's theory |
| C. | Bligh's theory |
| D. | Kennedy's theory |
| Answer» E. | |
| 25. |
Group I contains three broad classes of irrigation supply canal outlets. Group II presents hydraulic performance attributes.Group-IGroup-IIP. Non-modular outlet1. Outlet discharge depends on the water levels in both the supply canal as well as the receiving water course.Q. Semi-modular outlet2. Outlet discharge is fixed and is independent of the water levels in both the supply canal as well as the receiving water course.R. Modular outlet3. Outlet discharge depends only on the water level in the supply canal.The correct match of the items in Group I with the items in Group II is |
| A. | P-1; Q-2; R-3 |
| B. | P-3; Q-1; R-2 |
| C. | P-2; Q-3; R-1 |
| D. | P-1; Q-3; R-2 |
| Answer» E. | |
| 26. |
A stable channel is to be designed for a dischargeof Q m3/s with silt factor as per Lacey’s method. The mean flow velocity m/s in the channel is obtained by |
| A. | \(\left(\frac{QF^2}{140}\right)^\frac{1}{6}\) |
| B. | \(\left(\frac{QF^2}{140}\right)^\frac{1}{3}\) |
| C. | \(\left(\frac{Q^2F^2}{140}\right)^\frac{1}{6}\) |
| D. | \(0.48\left(\frac{Q}{f}\right)^\frac{1}{3}\) |
| Answer» B. \(\left(\frac{QF^2}{140}\right)^\frac{1}{3}\) | |
| 27. |
Following are the advantages of canal lining except |
| A. | Control of seepage |
| B. | Prevention of water-logging |
| C. | Reduction in maintenance cost |
| D. | Decrease in command area |
| E. | Increase in channel capacity |
| Answer» E. Increase in channel capacity | |
| 28. |
A regime canal carries silt of median size 0.25 mm. The Lacey’s silt factor of this silt is |
| A. | 0.66 |
| B. | 0.88 |
| C. | 0.44 |
| D. | 0.22 |
| Answer» C. 0.44 | |
| 29. |
In a river, silt excluder and silt ejector are constructed: |
| A. | at a location after the head regulator and at the head of the canal respectively. |
| B. | at the head of the canal and at a location after the head regulator respectively. |
| C. | at the same location |
| D. | at specific locations depending upon diverse factors and their locations do not follow a set pattern |
| Answer» C. at the same location | |
| 30. |
Kennedy found the Upper Bari Doab canals |
| A. | To be the most economical |
| B. | having the highest specific discharge |
| C. | having the highest critical velocity ratio |
| D. | to be non-silting and non-scouring |
| Answer» E. | |
| 31. |
Lacey's silt factor for medium silt whose average grain size is 0.25 mm, is likely to be |
| A. | 0.66 |
| B. | 0.77 |
| C. | 0.88 |
| D. | 0.99 |
| Answer» D. 0.99 | |
| 32. |
If V0 is the critical velocity of a channel, its silt carrying capacity, according to Kennedy is proportional to |
| A. | \(V_o^{1/2}\) |
| B. | \(V_o^{3/2}\) |
| C. | \(V_o^{1/4}\) |
| D. | \(V_o^{7/2}\) |
| Answer» D. \(V_o^{7/2}\) | |
| 33. |
Bed load is a term used to describe |
| A. | The combination of contact load and wash load |
| B. | The combination of contact load and saltation load |
| C. | The combination of contact load and suspended load near the bed |
| D. | The bed material load |
| E. | The wash load only |
| Answer» C. The combination of contact load and suspended load near the bed | |
| 34. |
In the alignment of an irrigation channel wherefrom off takes have to be provided at regular intervals, changes in the given channel parameters are made use of. The correct sequence of the decreasing order of preference of these parameters is |
| A. | width, slop, depth |
| B. | width, depth, slope |
| C. | depth, slope, width |
| D. | depth, width, slope |
| Answer» D. depth, width, slope | |
| 35. |
Khosla's formulae for assessing pressure distribution under weir floors are based on |
| A. | Potential flow in permeable layers just beneath the floors |
| B. | Boundary layer flow with pressure drop longitudinall |
| C. | Conformal transformation of potential flow into the w plane |
| D. | Simplification of 3-D flow |
| Answer» B. Boundary layer flow with pressure drop longitudinall | |
| 36. |
Garret’s diagram gives the graphical method of designing a channel based on |
| A. | Kennedy’s theory |
| B. | Lacey’s theory |
| C. | Gibbs theory |
| D. | Khosla’s theory |
| Answer» B. Lacey’s theory | |
| 37. |
A channel has a mean velocity of 0.6 m/s, which will keep the channel free from silting and scouring. This means the velocity is referred as: |
| A. | Critical velocity |
| B. | Terminal velocity |
| C. | Scouring velocity |
| D. | Settling velocity |
| Answer» B. Terminal velocity | |
| 38. |
A trapezoidal canal of bottom width B, depth d with a side slope z : 1 (horizontal : vertical) is formed in cutting for a length of L. It is proposed to provide lining to the canal. The surface area of lining the canal is: |
| A. | \(L\left( {B + 2d\sqrt {z + 1} } \right)\) |
| B. | \(L\left( {B + 2d\sqrt {{z^2} + 1} } \right)\) |
| C. | \(2L\left( {B + d\sqrt {{z^2} + 1} } \right)\) |
| D. | L(B + 2 z d) |
| Answer» C. \(2L\left( {B + d\sqrt {{z^2} + 1} } \right)\) | |
| 39. |
If the sensitivity of an irrigation module is 0.5 then what per cent variation in outlet discharge will be caused by a 50 % variation in canal water depth? |
| A. | 100% |
| B. | 50% |
| C. | 25% |
| D. | 12.5% |
| Answer» D. 12.5% | |
| 40. |
As per the Lacey’s method for design of alluvial channels, identify the true statement from the following |
| A. | Wetted perimeter increases with an increase in design discharge. |
| B. | Hydraulic radius increases with an increase insilt factor. |
| C. | Wetted perimeter decreases with an increase in design discharge. |
| D. | Wetted perimeter increases with an increase in the silt factor. |
| Answer» B. Hydraulic radius increases with an increase insilt factor. | |
| 41. |
A 20 m long horizontal concrete floor under a barrage on a permeable foundation retains a 5 m head of water and has a 5 m deep downstream end pile. The exit gradient is |
| A. | 1 in 4 |
| B. | 1 in 5 |
| C. | 1 in 6 |
| D. | 1 in 8 |
| Answer» C. 1 in 6 | |
| 42. |
Among the classification of canals based on alignment criteria, identify the canal in which the number of cross drainage works is maximum? |
| A. | Contour canal |
| B. | Side slope canal |
| C. | Detour canal |
| D. | Ridge canal |
| Answer» B. Side slope canal | |
| 43. |
A fall is constructed to: |
| A. | Create surplus energy |
| B. | Destroy the surplus energy |
| C. | Overcome surplus energy |
| D. | Maintain surplus energy |
| Answer» C. Overcome surplus energy | |
| 44. |
Garret’s diagram used for the design of irrigation channels contains |
| A. | Discharge plotted on the X-axis, slope on the primary Y-axis while water depth in the channel & critical velocity V0 on the secondary Y-axis |
| B. | Discharge plotted on the X-axis, critical velocity V0 on the primary Y-axis while water depth in the channel & slope on the secondary Y-axis |
| C. | Water depth plotted on the X-axis, slope on the primary Y-axis while Discharge in the channel & critical velocity V0 on the secondary Y-axis |
| D. | Water depth plotted on the X-axis, critical velocity V0 on the primary Y-axis while Discharge in the channel & slope on the secondary Y-axis |
| Answer» B. Discharge plotted on the X-axis, critical velocity V0 on the primary Y-axis while water depth in the channel & slope on the secondary Y-axis | |
| 45. |
A weir on a permeable foundation with downstream sheet pile is shown in the figure below. The exit gradient as per Khosla’s method is |
| A. | 1 in 6.0 |
| B. | 1 in 5.0 |
| C. | 1 in 3.4 |
| D. | 1 in 2.5 |
| Answer» D. 1 in 2.5 | |
| 46. |
Balanced depth of cutting of canal is |
| A. | half the total depth of a canal |
| B. | half of full supply depth |
| C. | the maximum cut that an excavator can take |
| D. | where volume of cutting is equal to volume of filling |
| Answer» E. | |
| 47. |
Garret diagram, for the design of irrigation channels, is based on: |
| A. | Kennedy’s Theory |
| B. | Lacey’s Theory |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» B. Lacey’s Theory | |
| 48. |
For which of the following reasons, the water shed line is abandoned for aligning an irrigation canal? |
| A. | It is densely populated |
| B. | The terrain is plain |
| C. | Canal is independent of river |
| D. | Irrigation canal is deep |
| Answer» B. The terrain is plain | |
| 49. |
A channel designed by Lacey’s theory has a mean velocity of 1.1 m/s. The silt factor is 1.1. Then hydraulic mean radius will be |
| A. | 1.13 m |
| B. | 2.75 m |
| C. | 3.13 m |
| D. | 4.27 m |
| Answer» C. 3.13 m | |
| 50. |
For medium silt whose average grain size is 0.16 mm, Lacey’s silt factor is likely to be |
| A. | 0.30 |
| B. | 0.45 |
| C. | 0.70 |
| D. | 1.32 |
| Answer» D. 1.32 | |