The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

A

$$\frac{1}{2}$$ × depth

B

$$\frac{1}{2}$$ × breadth

C

$$\frac{1}{2}$$ × sloping side

D

$$\frac{1}{4}$$ × (depth + breadth)

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

A

Half the depth

B

Half the breadth

C

Twice the depth

D

Twice the breadth

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

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

A

0.5

B

0.84

C

1.84

D

1.25

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

A

Parabolic

B

Hyperbolic

C

Straight line

D

None of these

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

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

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

A rectangular channel has cross sectional area of 50 m2 If the channel section is to be most economical, calculate the depth. Take Breadth = 10m .

A

10 m

B

5 m

C

8 m

D

12 m

If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

A

x

B

$$\frac{{\text{x}}}{2}$$

C

$$\frac{{\text{x}}}{3}$$

D

$$\frac{{2{\text{x}}}}{3}$$

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

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