Practice Irrigation Engineering Multiple Choice Questions Quiz-8 - MCQGeeks.com

Q.1

Seepage through foundation in an earthen dam is controlled by providing

rock toe
horizontal blanket
impervious cut off
chimney drain

Q.2

Irrigation canals are generally aligned along

Ridge line
Contour line
Valley line
Straight line

Q.3

The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally

2 : 1
3 : 1
4 : 1
5 : 1

Q.4

Pick up the correct statement from the following:

If the flexibility is more than one, the outlet is hyper-proportional
If the setting of an outlet is higher than that required for proportionality, the outlet is hyper-proportional
If the flexibility is zero, it is a rigid module
All the above

Q.5

Pick up the correct statement from the following:

The full supply level of a canal should be above ground level
According to Lacey, regime conditions require a particular slope for a given discharge and silt factor
In case the ground slope is less than the required bed slope, the silt factor must be reduced by permitting the entry of coarse silt
All the above

Q.6

Cross regulators in main canals are provided

To regulate water supply in the distributaries
To increase water head upstream when a main canal is running with low supplies
To overflow excessive flow water
None of these

Q.7

Process of meandering is due to

Sediment load of streams
Discharge and hydraulic properties of streams
Relative erodibility of the bed and banks
All the above

Q.8

Which one of the following statements is correct?

The canal system and the drainage system are complementary
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
All the above

Q.9

Cyclonic precipitation is caused by lifting of an air mass due to

pressure difference
temperature difference
natural topographical barriers
all of the above

Q.10

If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h + 1)/(G + t)
t = (h - 1)/(G + t)
t = (h - 1)/(G - t)
t = (h + 1)/G

Q.11

Infiltration capacity

is a constant factor
changes with time
changes with location
changes with both time and location

Q.12

The water utilizable by plants is available in soils mainly in the form of

gravity water
capillary water
hydroscopic water
chemical water

Q.13

For diversion of flood water of rivers, the type of canal constructed, is

Ridge canal
Perennial canal
Inundation canal
Canal

Q.14

The water stored in the reservoir below the minimum pool level is called

useful storage
dead storage
valley storage
surcharge storage

Q.15

A straight glacis type fall with a baffle platform and a baffle wall is called

Vertical drop-fall
Glacis fall
Montague type fall
Inglis fall

Q.16

Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to evaporation
Total precipitation minus the loss due to infiltration
Total precipitation during the crop period
Available water stored in soil within root zone of the crop

Q.17

Hydrodynamic pressure due to earthquake acts at a height of

3H/4π above the base
3H/4π below the water surface
4H/3π above the base
4H/3π below the water surface, where H is the depth of water

Q.18

The maximum permissible eccentricity for no tension at the base of a gravity dam is

B/2
B/3
B/4
B/6

Q.19

In rigid module, the discharge

Is independent of water levels in the distributary and water course
Depends upon the water level in distributary
Depends upon the water level in the water course
Depends upon the water levels of both, i.e. distributary and water course

Q.20

If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle ? with horizontal, the hydraulic mean depth is

D
D/2
D/3
D/5

Q.21

River training for depth is achieved by

groynes
construction of dykes or leavees
both (A) and (B)
groynes and bandalling

Q.22

For designing the venturi head,

Width of the throat should not be less than one-third of the bed width of main canal
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
Minimum throat width should not be less than 60 cm
All the above

Q.23

The major resisting force in a gravity dam is

water pressure
wave pressure
self-weight of dam
uplift pressure

Q.24

Which of the following spillways is least suitable for an earthen dam ?

ogee spillway
chute spillway
side channel spillway
shaft spillway

Q.25

Coefficient of discharge of an ogee spillway

depends on depth of approach and upstream slope
depends on downstream apron interference and downstream submergence
remains constant
both (A) and (B)

Q.26

An outlet is said to be proportional if its flexibility, is

Zero
Less than one
More than one
One

Q.27

If average particle size of the silt in millimeters is m, the Lacey's silt factor f is proportional to

m³
m^1/2
m^1/3
m^2/3

Q.28

The Lacey's regime velocity is proportional to

R^1/2 S^3/4
Q^3/4 S^1/3
R^3/4 S^1/3
R^2/3 S^1/2

Q.29

For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is

Zero
0.25
0.50
1.00

Q.30

If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be

equal to rate of rainfall
equal to infiltration capacity
more than rate of rainfall
more than infiltration capacity

0 h : 0 m : 1 s