A sloping apron is provided partly above the river bed and partly below the river bed in case of ____________________________

when TWC coincides with the JHC at all discharges

when TWC lies above the JHC at all discharges

when TWC lies below the JHC at all discharges

when TWC lies above the JHC at low discharges and below the JHC at high discharges

What is the expected solution for the case when the T.W.C is lying above the J.H.C curve at all discharges?

By providing a sloping apron below the river bed

By providing a simple concrete apron of length 5(Y1 – Y2)

By providing a sloping apron above the river bed

By providing a sloping apron below the river bed

The formation of hydraulic jump at the foot of a spillway is one of the common methods of energy dissipation because ______________________

it reduces the kinetic energy by increasing the depth of flow

it destroys more than 90% of total energy by the turbulence produced in the jump

it reduces the kinetic energy by increasing the depth of flow

it reduces the kinetic energy by decreasing the depth of flow

When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

either roller or ski-jump bucket

The energy dissipation at the toe of the spillway is affected basically by the use of hydraulic jump in _______________________

both roller and ski-jump bucket

a sloping apron below the downstream river bed

both roller and ski-jump bucket

11 + Mcqs in Energy Dissipation Overflow Spillway in Irrigation Engineering Page 1 McqOptions

1.	When the TWC lies below the JHC at all discharges, the problem can be solved by which of the following provisions?i. Constructing a sloping apron above the river bedii. Provision of roller bucket type of energy dissipatoriii. Provision of a ski-jump bucketiv. A sloping apron below the river bedv. Construction of a subsidiary damvi. A sloping apron partly above and partly below the river bed
A.	i, iii and v
B.	i, ii and vi
C.	iii, iv and v
D.	i, iii, iv and v
Answer» D. i, iii, iv and v

Discussion

2.	A sloping apron is provided partly above the river bed and partly below the river bed in case of ____________________________
A.	when TWC coincides with the JHC at all discharges
B.	when TWC lies above the JHC at all discharges
C.	when TWC lies below the JHC at all discharges
D.	when TWC lies above the JHC at low discharges and below the JHC at high discharges
Answer» E.

Discussion

3.	What is the expected solution for the case when the T.W.C is lying above the J.H.C curve at all discharges?
A.	By providing a simple concrete apron of length 5(Y1 – Y2)
B.	By providing a sloping apron above the river bed
C.	By providing a sloping apron below the river bed
D.	Provision of a ski-jump bucket
Answer» C. By providing a sloping apron below the river bed

Discussion

4.	Which of the following stilling basin help in stabilizing the flow and improve the jump performance?
A.	dentated sills
B.	chute blocks
C.	baffle piers
D.	friction blocks
Answer» C. baffle piers

Discussion

5.	The percentage of energy dissipation in a hydraulic jump increases with the increase in the Froude number.
A.	True
B.	False
Answer» B. False

Discussion

6.	A ski-jump bucket is also known as _____________________
A.	flip bucket
B.	solid roller bucket
C.	slotted roller bucket
D.	flexible bucket
Answer» B. solid roller bucket

Discussion

7.	The formation of hydraulic jump at the foot of a spillway is one of the common methods of energy dissipation because ______________________
A.	it destroys more than 90% of total energy by the turbulence produced in the jump
B.	it reduces the kinetic energy by increasing the depth of flow
C.	its action is not understood
D.	it reduces the kinetic energy by decreasing the depth of flow
Answer» B. it reduces the kinetic energy by increasing the depth of flow

Discussion

8.	The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is ________________
A.	chute block
B.	dentated sill
C.	morning glory
D.	baffle piers
Answer» D. baffle piers

Discussion

9.	When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________
A.	a roller bucket
B.	a ski-jump bucket
C.	either roller or ski-jump bucket
D.	a sloping apron
Answer» C. either roller or ski-jump bucket

Discussion

10.	The most ideal condition for energy dissipation in the design of spillways is the one when the tail-water rating curve coincides with the jump rating curve at all discharge.
A.	True
B.	False
Answer» B. False

Discussion

11.	The energy dissipation at the toe of the spillway is affected basically by the use of hydraulic jump in _______________________
A.	roller bucket
B.	a ski-jump bucket
C.	a sloping apron below the downstream river bed
D.	both roller and ski-jump bucket
Answer» D. both roller and ski-jump bucket

Discussion

Explore topic-wise MCQs in Irrigation Engineering.

A sloping apron is provided partly above the river bed and partly below the river bed in case of ____________________________

What is the expected solution for the case when the T.W.C is lying above the J.H.C curve at all discharges?

Which of the following stilling basin help in stabilizing the flow and improve the jump performance?

The percentage of energy dissipation in a hydraulic jump increases with the increase in the Froude number.

A ski-jump bucket is also known as _____________________

The formation of hydraulic jump at the foot of a spillway is one of the common methods of energy dissipation because ______________________

The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is ________________

When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

The most ideal condition for energy dissipation in the design of spillways is the one when the tail-water rating curve coincides with the jump rating curve at all discharge.

The energy dissipation at the toe of the spillway is affected basically by the use of hydraulic jump in _______________________