| For open channel flow best hydraulic section is |
A) circular
B) semi-circular
C) trapezoidal
D) rectangular
| In mild slope channel with uniform flow, the HGL |
A) coincides with the bed
B) is above the free surface
C) coincides with the free surface
D) is below the free surface
| The hydraulic jump always occurs from |
A) below critical depth to above critical depth
B) above critical depth to below critical depth
C) below critical depth to above normal depth
D) above normal depth to below normal depth
| The best hydraulic cross section of an open channel is the one having the |
A) least cost
B) minimum roughness coefficient
C) maximum perimeter
D) maximum wetted perimeter
| The cavitation and pitting can be prevented by creating which one of the following conditions? |
A) Reducing the pressure head
B) Reducing the velocity head
C) Increasing the elevation head
D) Reducing the piezometric head
| The discharge through a channel of circular section will be maximum when the depth of water is _____ times the diameter of circular channel. |
A) 0.34
B) 0.67
C) 0.81
D) 0.95
| In open channel, the specific energy is |
A) The total energy per unit discharge
B) The total energy measured above a horizontal datum
C) The total energy measured with respect to the channel bottom which is taken as datum
D) The kinetic energy plotted above the free surface
| Tranquil flow always occur at the depth |
A) equal to the mean hydraulic radius
B) equal to the surface roughness
C) above the critical depth
D) below the specific depth
| The length of the hydraulic jump is found to be |
A) 10 to 15 times depth of jump
B) 1 to 2 times depth of jump
C) 5 to 7 times depth of jump
D) Has no relation to the depth of jump
| Uniform flow is possible in which of the following cases? |
A) frictionless sloping channel
B) flow at a channel entrance
C) flow in the middle of a long prismatic channel
D) horizontal channel
