Canal Lining MCQs : This section focuses on the "Canal Lining" in Irrigation Engineering. These Multiple Choice Questions (MCQs) should be practiced to improve the Irrigation Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Canal lining is the process of reducing seepage loss of irrigation water by adding an impermeable layer to the edges of the trench.
C. Can be true or false
D. Can not say
Explanation: True, Canal lining is the process of reducing seepage loss of irrigation water by adding an impermeable layer to the edges of the trench.
Seepage can result in losses of ____________ of irrigation water from canals.
A. 10 to 30 percent
B. 20 to 35 percent
C. 15 to 25 percent
D. 30 to 50 percent
Explanation: Seepage can result in losses of 30 to 50 percent of irrigation water from canals, so adding lining can make irrigation systems more efficient.
The oldest known paved canal was discovered in?
Explanation: The oldest known paved canal was discovered in 1995 near the pyramids of Giza, and is estimated to be around 4,500 years old.
Plastic membranes are?
B. very thin
D. very thick
Explanation: Plastic membranes are very thin, varying in thickness from 8 up to 100 thousandths of an inch.
___________- is a simple form of soil canal lining, which serves as a relatively cheap alternative to other methods.
A. Concrete clay
B. Plastic membrane
C. Both A and B
D. Compacted clay
Explanation: Compacted clay is a simple form of soil canal lining, which serves as a relatively cheap alternative to other methods. Certain clays, such as bentonite, have high water absorption but then become impervious, which makes them an ideal soil lining.
What type of losses can be mainly avoided by lining the canals?
A. Evaporation Losses
B. Erosion of Canal Bed
C. Seepage Losses
D. Discharge Losses at Branch Canals
Explanation: If lining is not provided in the canal then irrigation water is lost in the form of percolation and absorption as seepage losses. This loss is very significant as it reduces the potential of the irrigation water, which is a costly commodity. So, in order to reduce seepage losses the lining of the canal is needed.
What is the name given to the land unfit for agriculture due to waterlogging?
C. Waterlogged Area
Explanation: Due to uncontrolled seepage losses the water in the canal gets percolated and the water table level in underground rises. This level rises up to or near the ground level. This renders the land unfit for agriculture as the crop roots bring up the alkali salts to the ground level. This phenomenon is known as waterlogging and the land is called thur.
Which of the following is not an advantage of the lining of the canal?
A. Seepage control
B. Increased maintenance costs
C. Prevention of water-logging
D. Increase in channel capacity
Explanation: Huge expenditure is spent on annual repair and maintenance of the unlined canal. The provision of lining reduces expenditure required for removal of silt, minor repairs like plugging of cracks, cuts, and removal of weeds and water plants.
Which of the following statement is wrong?
A. A lined canal is not susceptible to erosion
B. The provision of adequate lining reduces the danger of breaches of channel
C. The lining does not reduce the money spent in removing weeds
D. Lining eliminates flood dangers
Explanation: The plants flow down the canal due to higher flow velocities in lined-canals due to which expenditure is reduced considerably. A strong concrete lining eliminates the dangers from flood and minor repairs like plugging of cracks, cuts and uneven settlements of banks (which results in breaches of the channel).
Concrete canal lining is often used due to its high structural strength and longevity.
C. Can be true or false
D. Can not say
Explanation: True, Concrete canal lining is often used due to its high structural strength and longevity.