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Irrigation MCQ

Irrigation allowed farms to be _____ rivers.

Below

Under

Farther from

Answer

Correct Answer: Farther from

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

120°

110°

90°

80°

Answer

Correct Answer: 110°

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Groynes are generally built

Inclined up stream up to 30°

Inclined down stream upto 30°

All these

Perpendicular to the bank

Answer

Correct Answer: Inclined up stream up to 30°

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

Syphon

Syphon-aqueduct

Aqueduct

Super passage

Answer

Correct Answer: Aqueduct

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A hydraulic structure is designed to withstand

All these

Seepage forces

Hydraulic jump

Hydraulic pressure

Answer

Correct Answer: All these

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Select the correct statement from the following:

Duty of canal water is usually calculated at the head discharge of a channel

Duty of canal water is defined as the total area irrigated by the discharge averaging one unit during the base period of the duty

Duty of canal water at the outlet of a distributary, is generally known as outlet factor or outlet discharge factor

All these

Duty of canal water at the head of a channel and at the outlet of a distributary, differ considerably due to progressive losses of water

Answer

Correct Answer: All these

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The measure to remove water logging of land, is

To reduce percolation from canals and water courses and to increase outflow from the ground water reservoir

To reduce percolation from canals and water courses nor to increase outflow from the ground water reservoir

To reduce percolation from canals and water courses

To increase outflow from the ground water reservoir

Answer

Correct Answer: To reduce percolation from canals and water courses and to increase outflow from the ground water reservoir

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In a canal syphon, the flow is

With critical velocity

Pipe flow

Under atmospheric pressure

Under negative pressure

Answer

Correct Answer: Pipe flow

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

A super-passage

An aqueduct

A syphon aqueduct

None of these

Answer

Correct Answer: A super-passage

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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

Syphon-aqueduct

Syphon

Aqueduct

Super passage

Answer

Correct Answer: Super passage

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

None these

All these

Pond level

Discharge perimeters

F.S.L. of the canal

Answer

Correct Answer: All these

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Attracting groynes are built

Perpendicular to the bank

Inclined up stream

Inclined down stream

None of these

Answer

Correct Answer: Inclined down stream

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Pick the correct statement from the following:

If the flexibility is zero, it is a rigid module

All these

If the setting of an outlet is lower than that required for proportionality, the outlet is sub-proportional

If the setting of an outlet is higher than that required for proportionality, the outlet is hyper-proportional

If the flexibility is more than one, the outlet is hyper-proportional

Answer

Correct Answer: All these

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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

5 : 1

3 : 1

2 : 1

4 : 1

Answer

Correct Answer: 4 : 1

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

Heavy impact of water

Increase of the bed level

Less percentage of silt

Soft soil strata

Answer

Correct Answer: Less percentage of silt

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The useful moisture of soil, is equal to its

Difference between filed capacity and permanent wilting point within the root zone of plants.

Saturation capacity

Moisture content at permanent wilting point

Field capacity

Answer

Correct Answer: Difference between filed capacity and permanent wilting point within the root zone of plants.

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

15 cm lower

At the same level

15 cm higher

None of these.

Answer

Correct Answer: 15 cm lower

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

Fallow land

Alkaline area

Forest area

Populated area

Answer

Correct Answer: Fallow land

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A fall in a canal bed is generally provided, if

None of these.

Ground slope is practically the same as the designed bed slope

Ground slope exceeds the designed bed slope

Designed bed slope exceeds the ground slope

Answer

Correct Answer: Ground slope exceeds the designed bed slope

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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

Width of the throat should not be less than the width obtained from the formula B = Q / 1.2d3/2, where d is the difference in levels of F.S.L. and sill

All these

Answer

Correct Answer: All these

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Pick up the correct statement from the following:

All these

The full supply level of a canal should be above ground level

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

According to Lacey, regime conditions require a particular slope for a given discharge and silt factor

Answer

Correct Answer: All these

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