Test: Irrigation Engineering- 1 - Civil Engineering (CE) MCQ

# Test: Irrigation Engineering- 1 - Civil Engineering (CE) MCQ

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## 20 Questions MCQ Test Mock test series of SSC JE Civil Engineering 2025 - Test: Irrigation Engineering- 1

Test: Irrigation Engineering- 1 for Civil Engineering (CE) 2024 is part of Mock test series of SSC JE Civil Engineering 2025 preparation. The Test: Irrigation Engineering- 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Irrigation Engineering- 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Irrigation Engineering- 1 below.
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Test: Irrigation Engineering- 1 - Question 1

### Wetted perimeter of a regime channel for discharge of 144 cumec as per Lacey’s theory will be:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 1

Wetted perimeter is given by

Where Q = discharge in cumec

Wetted perimeter

Test: Irrigation Engineering- 1 - Question 2

### If the electrical conductivity of water is in between 750 to 2250 micro mhos/cm at 25oC, then it is classified as:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 2

Electrical Conductivity (EC):

It is the reciprocal of the Electrical Resistivity. Quantitively the electrical resistivity is the resistance, in ohms, of a conductor, metallic or electrolytes, which is 1 cm long and has a cross-sectional area of 1 cm2 at 25oC.

Units:

EC = Reciprocal ohms/cm or mhos/cm.

Test: Irrigation Engineering- 1 - Question 3

### A canal which is aligned at right angles to the contour is called

Detailed Solution for Test: Irrigation Engineering- 1 - Question 3

Watershed canal: The canal which is aligned along any natural watershed is called a watershed canal.

Contour canal: A contour canal is an artificially-dug navigable canal which closely follows the contour line of the land it traverses in order to avoid costly engineering works such as boring a tunnel through higher ground, building an embankment over lower ground, or constructing a canal lock (or series of locks) to change the level of the canal. Because of this, these canals are characterized by their meandering course.

Side slope canal: A side slope canal is that which is aligned at right angles to the contours i.e along the side slopes.

Branch canal: An offtakes from the main canal is known as branch canal.

Test: Irrigation Engineering- 1 - Question 4

The discharge passing over an ogee spillway is given by _______, Where, L is an effective length of spillway crest and H is the total head over the spillway crest including velocity head.

Detailed Solution for Test: Irrigation Engineering- 1 - Question 4

Dischage over an Ogee spillway is given by:

He = Total head upstream of the crest.

L = crest width

Cd = coefficient of discharge

C = constant, which is equal to

Test: Irrigation Engineering- 1 - Question 5

The sodium carbonate lining in canal consist of at least

Detailed Solution for Test: Irrigation Engineering- 1 - Question 5

Sodium carbonate lining consists of 10% clay and 6% sodium carbonate. This lining is not durable. Asphalt lining is prepared by spraying asphalt (i.e. bitumen) at a very high temperature (about 1500C) on a subgrade to a thickness varying from 3 mm to 6 mm.

Test: Irrigation Engineering- 1 - Question 6

The berms when fully formed:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 6

Berm: The narrow strip of land at the ground level between the inner toe of the bank and the top edge of the cutting is known as berm. The berms provide additional strength to banks and thus make it safe against breaches. The berms when fully formed performed the following functions:

i) Provide a bigger water way

ii) Protect the bank from erosion because of wave action

iii) Reduce the absorption losses and prevent leaks

iv) Provide a scope for future widening of the canal

v) Bring the saturation line within the embankment

Test: Irrigation Engineering- 1 - Question 7

Critical velocity of flow (Vo) given by Kennedy is

Where, m = critical velocity ratio, D = Depth of water over the bed portion of a channel in meters

Detailed Solution for Test: Irrigation Engineering- 1 - Question 7

Critical velocity of flow (Vo) given by Kennedy is

Where, m = critical velocity ratio

D = Depth of water over the bed portion of a channel in meters

Test: Irrigation Engineering- 1 - Question 8

Which of the following are the main causes of water logging:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 8

A land is said to be waterlogged when the air circulation is stopped in the root zone of the plant due to the rise in water table.

The main causes of waterlogging are as follows:

ii) Over and Intensive irrigation

iii) Presence of impermeable strata

iv) Nature of soil

v) Seepage from canals

vi) The topography of the land

Test: Irrigation Engineering- 1 - Question 9

A field of 500 hectares is to be irrigated for a particular crop having 100 days base period. The total depth of water required by the crop is 100 cm. Calculate the duty of the water (in hectares per cubic metre).

Detailed Solution for Test: Irrigation Engineering- 1 - Question 9

Using the relation

Δ → depth of water required (cm)

D → Duty (hectares per cumec)

B → Base period (days)

Δ = 100 cm,   B = 100 days

D = 864 hectares per cumec

Test: Irrigation Engineering- 1 - Question 10

For smooth entry, the regulators are aligned at an angle of “x” to the water. The value of “x” is:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 10

For a smooth entry into the water, the regulators should be positioned at an angle that allows for a gradual and streamlined descent. This angle is typically less than 90 degrees, as an angle greater than 90 degrees would cause a more abrupt and potentially disruptive entry.

Test: Irrigation Engineering- 1 - Question 11

The relation for discharge over a rectangular crest of a sarda fall is

Where, L = Length of crest in meters

B = top width of the crest in meters

H = depth of water in meters

Detailed Solution for Test: Irrigation Engineering- 1 - Question 11

Discharge over a rectangular crest of a sarda fall is given by:

Where, L = Length of the crest in meters

B = top width of the crest in meters

H = depth of water in meters

Test: Irrigation Engineering- 1 - Question 12

Lysimeter is used to measure:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 12

Lysimeter is used to measure evapotranspiration. By recording the amount of precipitation that an area receives and the amount lost through the soil, the amount of water lost to evapotranspiration can be calculated.

Test: Irrigation Engineering- 1 - Question 13

The unit of duty is:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 13

The duty is defined as area irrigated in hectare when unit discharge flows for a base period B. It is measured in hectare per cumec.

Test: Irrigation Engineering- 1 - Question 14

Lacey’s regime theory is not applicable to:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 14

If a channel is excavated with smaller width and flatter bed slope, then flow takes place and bed slope increases due to deposition of silt. With increase in bed slope, the depth of channel may also vary but width of channel remains same because channel is usually cohesive and resists erosion.

Final Regime: This is the ultimate state of regime attained by channel when the slope, width and depth are also adjusted as per requirement. Resistance of sides are overcome due to continuous action of water.

True Regime:  Practically, true regime is never attained.

Lacey’s theory is not applicable to initial regime. True regime is not attained, hence this theory is applicable to final regime channels.

Test: Irrigation Engineering- 1 - Question 15

A super passage is:

Test: Irrigation Engineering- 1 - Question 16

The structure build at the head of the watercourse so as to connect it with a minor or a distributor channel is known as:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 16

The success of any irrigation enterprise depends on the efficiency of distributing sufficient supply of water to the irrigator. Each irrigator has to receive certain quantity of water proportionate to his extent in a canal system at the proper time to ensure him a good crop. This distribution of water is carried out by means of outlets otherwise called modules. Hence, proper design of an outlet, is of most importance not only to the canal engineer but to the irrigator also.

Test: Irrigation Engineering- 1 - Question 17

If D is the depth of scour below original bed, then the width of launching apron is generally taken as:

Detailed Solution for Test: Irrigation Engineering- 1 - Question 17

Heavy scour of the river bed at curved heads and shanks of guide banks can cause undermining of stone pitching thereby resulting in failure of guide banks. Such a failure can be prevented by providing launching apron beyond the toe of guide banks. The width of launching apron is generally taken as 1.5D.

Test: Irrigation Engineering- 1 - Question 18

Which of the following is Rabi crop?

Detailed Solution for Test: Irrigation Engineering- 1 - Question 18

The rabi crops are sown around mid-November, after the monsoon rains are over, and harvesting begins in April/May. The crops are grown either with rainwater that has percolated into the ground, or with irrigation.

The major rabi crop in India is wheat, followed by barley, mustard, sesame and peas.

Test: Irrigation Engineering- 1 - Question 19

Which one of the following is the purpose of providing the downstream sheet pile in a barrage?

Detailed Solution for Test: Irrigation Engineering- 1 - Question 19

Water that percolates through earth dams and their foundations can carry soil particles that are free to migrate. The seepage forces tend to cause the erodible soil to move towards the downstream face of the dam and can cause failure of the dam which is known as piping failure. Downstream sheet pile is used to control failure due to piping.

Test: Irrigation Engineering- 1 - Question 20

Which of the following spillway gates cannot be seen from a distance, when lowered?

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## Mock test series of SSC JE Civil Engineering 2025

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