Day 43-Nov 3-worksheet-Diploma-OCH-Geometry&Types of flow

Which of the following is not an application of open channel flow?

• Design of sewers

• Design of navigation systems

• Design of turbines

• Design of canals

In an open channel, the interface between water and atmosphere is known as —

• Wetted surface

• Hydraulic gradient

• Free water surface

• Surface tension layer

The efficiency of a channel section increases when —

• Wetted perimeter increases

• Hydraulic radius decreases

• Wetted perimeter decreases

• Flow depth decreases

In a trapezoidal open channel, the wetted perimeter is given by —

• B + y

• B + 2y

• B + 3y

• 2B + y

In open channel flow, the water surface is subjected to atmospheric pressure.

• True

• False

Hydraulic radius is defined as the ratio of wetted perimeter to flow area.

• True

• False

The vertical distance between river bed and free water surface is called (a)   .

The width of channel section at the free water surface is called (a)   .

The length of the boundary in contact with water in a channel cross-section is called (a)   .

For the same area of flow, as wetted perimeter decreases, the hydraulic radius (a)   .