River training for depth is achieved by
A. groynes
B. construction of dykes or leavees
C. both (A) and (B)
D. groynes and bandalling
Select an option to see the answer and solution.
For designing the venturi head,
A. Width of the throat should not be less than one-third of the bed width of main canal
B. Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
C. Minimum throat width should not be less than 60 cm
D. All the above
Select an option to see the answer and solution.
For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is
Select an option to see the answer and solution.
If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be
A. equal to rate of rainfall
B. equal to infiltration capacity
C. more than rate of rainfall
D. more than infiltration capacity
Select an option to see the answer and solution.
A hydraulic jump is generally formed when a stream moving with
A. A hyper-critical velocity meets a stream moving with a critical velocity
B. A hyper-critical velocity meets a stream moving with a hyper-critical velocity
C. A hyper-critical velocity meets a stream moving with a sub-critical velocity
D. A sub-critical velocity meets a stream moving with a hyper-critical velocity
Select an option to see the answer and solution.
Hydrodynamic pressure due to earthquake acts at a height of (where H is the depth of water)
A. 4 π 3 H above the base
B. 4 π 3 H below the water surface
C. 3 π 4 H above the base
D. 3 π 4 H below the water surface
Select an option to see the answer and solution.
The maximum permissible eccentricity for no tension at the base of a gravity dam is
Select an option to see the answer and solution.
The major resisting force in a gravity dam is
A. water pressure
B. wave pressure
C. self-weight of dam
D. uplift pressure
Select an option to see the answer and solution.
Which of the following spillways is least suitable for an earthen dam ?
A. ogee spillway
B. chute spillway
C. side channel spillway
D. shaft spillway
Select an option to see the answer and solution.
Coefficient of discharge of an ogee spillway
A. depends on depth of approach and upstream slope
B. depends on downstream apron interference and downstream submergence
C. remains constant
D. both (A) and (B)
Select an option to see the answer and solution.
The "outlet discharge factor" is the duty at the head of
A. main canal
B. branch canal
C. watercourse
D. distributory
Select an option to see the answer and solution.
If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ω is the density of water, then
A. Total pressure on the surface is equal to ω x
B. Depth of the point at which total pressure acts is equal to its moment of inertia divided by A x
C. Depth of the centre of pressure is 3 2 H vertically below the surface
D. All the above
Select an option to see the answer and solution.
A water-logged land is found suitable for cultivation due to
A. Ease of tillage for preparation of the field for optimum condition of germination
B. Absence of aeration of soil from root zone of the plant
C. Regular supply of water to plants from the water table by capillary action
D. None of these
Select an option to see the answer and solution.
An outlet which maintains a constant discharge irrespective of fluctuation in the water levels of the supplying channel or water course, is known as
A. Non-modular outlet
B. Semi-modular outlet
C. Flexible modular outlet
D. Right modular outlet
Select an option to see the answer and solution.
If L is total length of a canal in kilometers, P is total perimeter of its lining in metres and C is the cost of lining per square metre, the additional expenditure involved on lining, is
A. 1000 PLC
B. 1000 PLC
C. 1000 C PL
D. 100 L PC
Select an option to see the answer and solution.
Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
A. slope-area method
B. area-velocity method
C. moving boat method
D. ultra-sonic method
Select an option to see the answer and solution.
The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in
A. aqueduct and syphon aqueduct
B. aqueduct and super passage
C. super passage and canal syphon
D. level crossing
Select an option to see the answer and solution.
According to Bligh's creep theory, percolating water flows along
A. Straight path under the foundation of the dam
B. Circular path under the foundation of the dam
C. The outline of the base of the foundation of the dam
D. None of these
Select an option to see the answer and solution.
A river training work is generally required when the river is
A. Meandering
B. Aggrading
C. Degrading
D. All the above
Select an option to see the answer and solution.
A river training work is generally required when the river is
A. aggrading type
B. degrading type
C. meandering type
D. both (A) and (B)
Select an option to see the answer and solution.