Irrigation Engineering Mock Test 3

10%

Question 1 of 10

1. The distance measured above the F.S.L and to the top of the lining is known as free-board.

True

False

Question 1 of 10

Question 2 of 10

2. Which of the following statement is incorrect about Expansive soils?

They have high compressibility and liquid limits with more than 50

The lesser the swelling pressure, the more troublesome is the soil

Expansive soils exhibit shrinkage and swelling properties

Black cotton soil is the most common expansive soil in India

Question 2 of 10

Question 3 of 10

3. Design a lined canal to carry a discharge of 400 cumecs and slope is 1 in 6000. Take side slopes as 1 : 1 and rugosity constant as 0.012. Assume limiting velocity as 3 m/sec.

Total Depth = 6.3 m, Bed Width = 15 m

Total Depth = 6.28 m, Bed Width = 14.2 m

Total Depth = 6.25 m, Bed Width = 14.4 m

Total Depth = 6.5 m, Bed Width = 14 m

Question 3 of 10

Question 4 of 10

4. Which type of borrow pits are preferred more?

Borrow pits

Spoil Banks

External Borrow Pits

Internal Borrow Pits

Question 4 of 10

Question 5 of 10

5. A land is said to be water-logged when _______________

there is an accumulation of alkali salts in the root zone of the crop

there is salinity in the soil

there is a reduction in crop yield

the aeration is stopped in the root zone due to the rise in water content

Question 5 of 10

Question 6 of 10

6. If the width of a river increases, the discharge per unit width will decrease and therefore, sediment carrying capacity will increase.

False

True

Question 6 of 10

Question 7 of 10

7. Salinity increases the osmotic activity of the plants.

False

True

Question 7 of 10

Question 8 of 10

8. The actual capacity of silt laiden water channel is worked out with 1/2 : 1 side slopes.

False

True

Question 8 of 10

Question 9 of 10

9. What is the name given to the drains used in depressions?

Open Drains

Drains

Shallow Surface Drains

Deep Surface Drains

Question 9 of 10

Question 10 of 10

10. Calculate the effective unit tractive force that causes bed load transportation if the unit tractive force produced by the flowing water is 3.20 N/m². The Manning's coefficient on an unrippled bed is 0.0108 and the actual observed value of Manning's coefficient on ripped channels is 0.0222. Take the value of critical shear stress that is required to move the grain particle as 0.5 N/m².

0.58 N/m²

1.58 N/m²

0.222 N/m²

1.08 N/m²

Question 10 of 10