In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is_________________?

Related Mcqs:

1. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?

   A. 0.3
   B. 0.9
   C. 0.03
   D. 0.66

2. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?

   A. 0.1
   B. 0.55
   C. 0.95
   D. 1.85

3. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?

   A. 0.5
   B. 1
   C. 1.5
   D. 2

4. Normal depth in open channel flow is the depth of flow in the channel ____________________?

   A. Corresponding to uniform flow
   B. Measured normal to the channel bed
   C. Corresponding to steady flow
   D. None of these

5. The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?

   A. 0.5
   B. 1
   C. 1.5
   D. 2

6. If ‘x’ is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?

   A. x
   B. x/2
   C. x/3
   D. 2x/3

7. Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?

   A. Flow rate
   B. Mean velocity
   C. Both ‘a’ & ‘b’
   D. Neither ‘a’ nor ‘b’

8. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?

   A. √(HW/π)
   B. HW/2 (H + W)2
   C. HW/4 (H + W)2
   D. 2HW/(H + W)

9. Gradually varied flow in open channel is a/an ____________ flow?

   A. Steady uniform
   B. Steady non-uniform
   C. Unsteady uniform
   D. Unsteady non-uniform

10. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?

    A. 1/(y/3)
    B. 2y/3
    C. 1/(y/4)
    D. 3y/4