Irrigation Engineering Practice Test 5

1. What is the name given to the first effect created by the construction of a weir?

Crest Damage

Afflux

Retrogression

Scouring

2. Which type of flume does the diagram depict?

Modular Venturi Flume

Venturi Flume

Free Flow Venturi Flume

Standing Wave Flume

3. How many types of falls are present?

4. Which method is evolved by khosla for designing of hydraulic structures?

Method of Variables

Method of Flow Nets

Method of Gradients

Method of Independent Variables

5. What structure does the diagram represent?

Standing Wave Flume

Drowned Venturi Flume

Venturi Flume

Non modular Venturi Flume

6. The ordinate of the uplift pressure at a point is found to be 2.8 m while designing the downstream floor thickness of a weir. If the relative density of concrete is 2.4 then the minimum thickness of the floor to be provided for resisting uplift pressure without accounting safety factor is _______

2 m

2.8 m

0.8 m

1.16 m

7. Calculate the velocity over the notch (V₁) and the velocity through the pipe (V₃) if the full supply discharge is 2 cumecs. The area of flow over the trapezoidal notch is 0.58 m². Assume the value of diameter of the pipe used as 1 m.

V₁ = 2.54 m/sec and V₃ = 3.44 m/sec

V₁ = 3.44 m/sec and V₃ = 2.54 m/sec

V₁ = 3.44 m/sec and V₃ = 3.44 m/sec

V₁ = 0.44 m/sec and V₃ = 2.04 m/sec

8. The length of the weir will not exceed the bed width of the canal upstream, in case of trapezoidal notch fall.

False

True

9. The structure finally subsides in the hollow formed in the foundation in which failure?

Overturning

Undermining

Collapse

Uplift

10. By how many factors the design of protection works is based?