Irrigation MCQ Questions & Answers

Question 1

A river training work is generally required when the river is

A. meandering
B. aggrading
C. degrading
D. all the above.

Question 2

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.

Question 3

Attracting groynes are built

A. perpendicular to the bank
B. inclined down stream
C. inclined up stream
D. none of these.

Question 4

Borrow pits should preferably be located in

A. field on the left side of the canal
B. field on the right side of the canal
C. fields on both sides of the canal
D. central half width of the section of the canal.

Question 5

F.S.L. of a canal at its head with respect to parent channel is kept

A. at the same level
B. 15 cm lower
C. 15 cm higher
D. none of these.

Question 6

For a given discharge in a channel, Blench curves give the relationship between the loss of head (HL) and

A. specific energy up-stream
B. specific energy down-stream
C. critical depth of water down-stream
D. depth of water down-stream

Question 7

For smooth entry of water in a canal, the angle between head regulator and water is generally kept

A. 80°
B. 90°
C. 110°
D. 120°

Question 8

For the conditions enumerated to provide a crossing at C1 You will probably provide

A. an aqueduct
B. a super-passage
C. a syphon aqueduct
D. none of these.

Question 9

For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

A. Bligh's theory
B. Electrical analogy method
C. The relaxation method
D. Khosla's method of independent variables.

Question 10

Groynes are generally built

A. perpendicular to the bank
B. inclined up stream up to 30°
C. inclined down stream upto 30°
D. all the above.

Question 11

If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the perimeter of the canal is

A. R(θ + tan θ)
B. 2R(θ + tan θ)
C. R(θ + cos θ)
D. 2R(θ + cos θ)

Question 12

In a canal syphon, the flow is

A. under atmospheric pressure
B. pipe flow
C. with critical velocity
D. under negative pressure.

Question 13

In a Sarda type fall, the rectangular crest, may be used for discharge upto

A. 6 cumecs
B. 10 cumecs
C. 14 cumecs
D. 20 cumecs

Question 14

Irrigation canals are generally aligned along

A. ridge line
B. contour line
C. valley line
D. straight line.

Question 15

Pick up the correct statement from the following

A. Approach of the water line in a flumed channel section should not be steeper than
B. Departure of the water line from a flumed channel section should not be steeper than 30°
C. Approach of the water line should not be steeper than 30° and departure line not steeper than in a flumed channel section
D. Approach and departure of the water line in a flumed channel section, should not be steeper than

Question 16

Pick up the correct statement from the following

A. In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal
B. In a level crossing a regulator is provided across the drainage at its down-stream
C. In a level crossing, a cross regulator is provided on the canal below the crossing
D. All the above.

Question 17

Pick up the incorrect statement from the following

A. Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
B. Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
C. Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
D. None of these.

Question 18

Pick up the incorrect statement from the following

A. A bank in the cross-section of a canal is provided on the right
B. A bank in the cross-section of a canal is provided on the left
C. A 'dowla' in the cross-section of a canal is provided on the left
D. None of these.

Question 19

Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less

A. populated area
B. alkaline area
C. forest area
D. fallow land.

Question 20

Pick up the incorrect statement from the following:

A. In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area
B. In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
C. In furrow irrigation water is admitted between the rows of plants in the field
D. None of these.

Question 21

Retrogression of the bed level of a river downstream a weir, occurs due to

A. heavy impact of water
B. increase of the bed level
C. less percentage of silt
D. soft soil strata.

Question 22

Side slopes generally kept for canals in loam soil, are :

A. 1 : 1 in cutting and : 1 in filling
B. : 1 in cutting and 2 : 1 in filling
C. Neither (a) nor (b)
D. Both (a) and (b)

Question 23

The crest level of a canal diversion head work, depends upon

A. F.S.L. of the canal
B. discharge perimeters
C. pond level
D. all the above

Question 24

The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept

A. 0.20 m
B. 1.20 m
C. 2.20 m
D. 3.20 m

Question 25

The difference in level between the top of a bank and supply level in a canal, is called

A. berm
B. free board
C. height of bank
D. none of these.

Question 26

The discharge over a trapezoidal crest of a Sarda fall with free over fall conditions, is

A. 0.45 2g . LH3/2 (H/B)1/3
B. 0.45 2g . LH2/3 (H/B)2/3
C. 0.45 2g . LH3/2 (H/B)1/6
D. 0.45 2g . LH1/6 (H/B)3/2

Question 27

The intensity of irrigation means

A. percentage of culturable commanded area to be irrigated annually
B. percentage of gross commanded area to be irrigated annually
C. percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
D. total depth of water supplied by the number of waterings.

Question 28

The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of

A. reverse curve
B. next curve of the same order
C. reverse curve plus the width of the river
D. none of these.

Question 29

The main function of a diversion head works of a canal from a river, is

A. to remove silt
B. to control floods
C. to store water
D. to raise water level

Question 30

The measure to remove water logging of land, is

A. to reduce percolation from canals and water courses
B. to increase outflow from the ground water reservoir
C. both (a) and (b)
D. neither (a) nor (b)

Question 31

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

A. 02:01
B. 03:01
C. 04:01
D. 05:01

Question 32

The sinuosity of a meander is the ratio of

A. meander length and the width of meander
B. meander length and half width of the river
C. curved length and the straight distance
D. none of these.

Question 33

The top of the capillary zone

A. lies below the water table at every point
B. lies above the water table at every point
C. coincides the water table at every point
D. none of these.

Question 34

Water-shed line is abondened for aligning an irrigation canal if

A. water shed forms a sharp loop
B. canal has to take off from a river
C. towns and villages are located on the water shed line
D. all the above.

Question 35

When a canal and a drainage approach each other at the same level, the structure so provided, is

A. an aqueduct
B. a syphon
C. a level crossing
D. inlet and outlet.

Question 36

When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called

A. syphon
B. aqueduct
C. super passage
D. syphon-aqueduct.

Question 37

When a canal is carried over a natural drainage, the structure provided, is known as

A. syphon
B. aqueduct
C. super passage
D. syphon-aqueduct.

Question 38

An example of the application of prestressed concrete in aqueducts in India is?

A. Yamuna
B. Gomati
C. Krishna
D. Penna

Question 39

Prestressed concrete domes with which type of beam provides an ideal solution to cover such large containment vessels are ____________

A. Ring beam
B. Trapezoidal beams
C. Elliptical beams
D. Transverse beams

Question 40

The capacity of prestressed concrete tanks may vary from ____________

A. 600 to 60000m3
B. 400 to 40000m3
C. 200 to 20000m3
D. 500 to 50000m3

Question 41

The circular shape was planned at Bhima aqueduct reduced ____________

A. Factor of safety
B. Rugosity coefficient
C. Tension coefficient
D. Deflection

Question 42

The concrete tabular aqueducts prestressed both longitudinal and transversal serves how many purposes?

A. One
B. Three
C. Dual
D. Five

Question 43

The concrete, aqueducts and siphons are required for ____________

A. Storage of water
B. Transportation of water
C. Distribution of water
D. Blockage of water

Question 44

The example of prestressed concrete reservoir is ____________

A. Ball tank built at trombay, Maharashtra
B. Ball tank built at trombay, Assam
C. Ball tank built at trombay, Goa
D. Ball tank built at trombay, Madhya pradesh

Question 45

The girders are supported on which type of well foundations?

A. Double D shaped
B. Trapezoidal shaped
C. T shaped
D. Dome shaped

Question 46

The prestressed concrete is ideally suited for the construction of ____________

A. Medium and long span bridges
B. Short span bridges
C. Lined span bridges
D. Curved span bridges

Question 47

Virendeel girders are widely used in ____________

A. America
B. Singapore
C. Europe
D. France