Irrigation Engineering Practice Test 3

1. 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

1.08 N/m²

1.58 N/m²

0.222 N/m²

2. Mathematically, depending on what factor we can say velocity increases the capacity of the canal?

Coefficient of Viscosity

Coefficient of Roughness

Coefficient of Resistance

Coefficient of Capillarity

3. Which factor depends upon the depressions of the terrain and causes water logging?

Irregular Topography

Impervious Obstruction

Excessive Rains

Inadequate Surface Drainage

4. What is range of side slopes for a canal in cutting?

1.5 H : 1 V to 1.5 H : 1 V

1 H : 1 V to 1.5 H : 1 V

1.5 H : 1 V to 1 H : 1 V

1 H: 0.5 V to 1 H : 1 V

5. Which of the following is a remedial measure for water-logging?

Quick disposal of rainwater

By lowering the F.S.L of the canals

Installation of lift irrigation systems

Controlling seepage from the canals

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

False

True

7. Lining of canals can bring high areas under command.

False

True

8. Which type of lining is popular in India?

Shotcrete Lining

Cement Concrete Lining

Brick Lining

Boulder Lining

9. Lining decreases the channel capacity and consequently reduces the required channel section.

True

False

10. Removal of silt considerably reduces the annual expenditure required on unlined channels for desilting.

False

True