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Test: Irrigation Efficiencies - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Irrigation Engineering - Test: Irrigation Efficiencies

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

What is water conveyance efficiency?

Detailed Solution for Test: Irrigation Efficiencies - Question 1

It is the ratio of water delivered into the fields to the water entering into the channel. This efficiency accounts for the conveyance or transit losses.

Test: Irrigation Efficiencies - Question 2

Which efficiency is also called on-farm efficiency?

Detailed Solution for Test: Irrigation Efficiencies - Question 2

The water application efficiency is the ratio of water stored in the root zone to the water actually delivered to the field. It takes into consideration the water lost in the farm hence, it is also known as on-farm efficiency.

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Test: Irrigation Efficiencies - Question 3

The presence of excess salts in the soil requires ______

Detailed Solution for Test: Irrigation Efficiencies - Question 3

Leaching is the supply of additional water to wash away the salts in a saline prone area. The presence of excess salts in water requires high water storage efficiency in order to keep the salts washed out of the soil.

Test: Irrigation Efficiencies - Question 4

The mean depth of water is 1.5 cm and the mean deviation from the mean is 0.1 cm. Determine its distribution efficiency.

Detailed Solution for Test: Irrigation Efficiencies - Question 4

The formula for distribution efficiency is:
Nd = (1- d/D) x 100; where d = mean deviation and D = mean depth of water
Given, d=0.1 cm and D = 1.5 cm
Hence, Nd = 93%.

Test: Irrigation Efficiencies - Question 5

The quantity of water that is pumped into a farm distribution system is 2 cumec. 1.6 cumec is delivered to a turn-out, 1km from the well. Compute the conveyance efficiency.

Detailed Solution for Test: Irrigation Efficiencies - Question 5

By definition, Conveyance efficiency Nc = (output/input) x 100
Given, Output = 1.6 cumec and Input = 2 cumec
So, Nc = 80%.

Test: Irrigation Efficiencies - Question 6

Which of the following statement is wrong about consumptive use efficiency?

Detailed Solution for Test: Irrigation Efficiencies - Question 6

It is the ratio of normal consumptive use of water to the net amount of water depleted from the root zone. It accounts for the loss of water by deep percolation and evaporation following irrigation.

Test: Irrigation Efficiencies - Question 7

Uniformity coefficient is also known as ______

Detailed Solution for Test: Irrigation Efficiencies - Question 7

Water distribution efficiency is also known as the uniformity coefficient. It is the measure of how uniformly water is applied to the area being irrigated. The effectiveness of irrigation is measured by its uniformity coefficient.

Test: Irrigation Efficiencies - Question 8

The mean depth of water is 1.5 cm and the mean deviation from the mean is 0.1 cm. Determine its distribution efficiency.

Detailed Solution for Test: Irrigation Efficiencies - Question 8

The formula for distribution efficiency is:
Nd = (1- d/D) x 100; where d = mean deviation and D = mean depth of water
Given, d=0.1 cm and D = 1.5 cm
Hence, Nd = 93%.

Test: Irrigation Efficiencies - Question 9

What is the correct formula for uniformity coefficient efficiency?

Detailed Solution for Test: Irrigation Efficiencies - Question 9

The correct representation of the formula is Nd = 1-d/D.
Where Nd = water distribution efficiency, d = deviation from the mean depth and D = mean depth.

Test: Irrigation Efficiencies - Question 10

The water distribution efficiency is 1.0 if _____

Detailed Solution for Test: Irrigation Efficiencies - Question 10

It represents the extent to which the water has penetrated to a uniform depth throughout the area. If the water penetrates uniformly throughout the field, the deviation from the mean depth is zero and hence, water distribution efficiency is 1.0.

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