ExamVeda
Login
Home

Irrigation Engineering MCQ Questions & Answers | Civil Engineering

Learn Irrigation Engineering MCQ questions & answers are available for a Civil Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Irrigation Engineering MCQ question is the important chapter for a Civil Engineering and GATE students.

Each section contains 100 MCQs on Irrigation Engineering .
1
Finally formed berms in canals are provided for
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
2
Canals constructed for draining off water from water logged areas, are known
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
3
A hydroelectric scheme operating under a head of 80 m will be classified as
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
4
Irrigation water having the concentration of Na++, Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as
Discuss
Answer & Solution
Answer: Option D
Solution:
Irrigation water is classified based on its sodium concentration relative to the concentrations of calcium and magnesium ions. The classification is determined by the sodium absorption ratio (SAR), which is calculated using the following formula:

SAR = (Na++ / √(Ca++ + Mg++)) * 100

Given the concentrations provided:

Na++ = 20 meq/L
Ca++ = 3 meq/L
Mg++ = 1 meq/L


Plugging these values into the SAR formula:
SAR = (20 / √(3 + 1)) * 100
SAR ≈ (20 / √4) * 100
SAR ≈ (20 / 2) * 100
SAR ≈ 10 * 100
SAR ≈ 1000

According to the classification:

SAR < 10: Low sodium water
10 ≤ SAR < 18: Medium sodium water
18 ≤ SAR < 26: High sodium water
SAR ≥ 26: Very high sodium water

Since the calculated SAR is approximately 100, the irrigation water falls into the category of very high sodium water.
5
If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
6
A minimum of 90 cm free board is provided if the discharge in the canal is between
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
7
If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
8
The difference in level between the top of a bank and supply level in a canal, is called
Discuss
Answer & Solution
Answer: Option B
Solution:
In irrigation engineering, the difference in level between the top of a bank and the supply level in a canal is termed as the free board. This term refers to the vertical distance between the water level in the canal and the top of the embankment or bank. The free board provides a safety margin to prevent overflow or breach of the canal embankment during high water flow or flooding events.
9
The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
10
The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board