20 Questions MCQ Test Mock Test Series of SSC JE Civil Engineering - Test: Irrigation Engineering- 2
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Which of the following statement is correct for sprinkler irrigation method?
Detailed Solution for Test: Irrigation Engineering- 2 - Question 1
In this method Irrigation water is applied to the land in the form of spray. The sprinkler irrigation is used for all the crops except rice and jute and for almost all the soils except very heavy soils with very low infiltration rates.
In this method, borders and field channels are not required and hence more land is available for cropping.
Detailed Solution for Test: Irrigation Engineering- 2 - Question 3
Due to the presence of injurious salts like Na2CO3, Na2SO4 and NaCl, Soil will become saline which lead to efflorescence and if it continuous for a longer time then the soil will become alkaline. These soils are reclaimed by leaching, crop rotation, providing sub surface drainage area, addition of gypsum etc.
On the other hand, acidic soils can be reclaimed by basic salts such as limestone.
Detailed Solution for Test: Irrigation Engineering- 2 - Question 5
Check dams are small barriers built across the direction of water flow on shallow rivers and streams for the purpose of water harvesting. The small dams retain excess water flow during monsoon rains in a small catchment area behind the structure.
The base width of a solid gravity dam is 25 m. The material of the dam has a specific gravity of 2.56 and the dam is designed as an elementary profile ignoring uplift. What is the approximately allowable height of the dam?
Detailed Solution for Test: Irrigation Engineering- 2 - Question 6
At a certain point in the floor of weir, the uplift pressure head due to seepage is 4.5 m. If the relative density of concrete is 2.5, the minimum thickness of floor required at this point to counteract the uplift pressure is:
Detailed Solution for Test: Irrigation Engineering- 2 - Question 7
In a river, silt excluder and silt ejector are constructed:
Detailed Solution for Test: Irrigation Engineering- 2 - Question 8
Silt excluders are constructed on the bed of the river, upstream of the head regulator. While silt ejectors are constructed on the bed of the canal and a little distance downstream from the head regulator.
As, Silt excluders remove silt from the water before it enters the canal and silt ejectors extract the silt from the canal water after the silted water has travelled a certain distance in the off-take canal.
Detailed Solution for Test: Irrigation Engineering- 2 - Question 11
i) The canal which is aligned along the *water-shed line* is known as ridge canal. Canal can also be aligned along contours of the country, right angle to contours of the country but the most economical is ridge canal. The advantage of this type of canal is that it can irrigate the areas on both the sides.
ii) As per financial perspective of the country, canal should not be located near-by our valuable properties because of problems in flood like situations.
iii) It should be so aligned such that minimum number of cross drainage work is required.
The loss of head per unit length of the creep is called:
Detailed Solution for Test: Irrigation Engineering- 2 - Question 12
According to Bligh’s creep theory, the percolation water creeps along the base profile of the apron with the sub-soil. The path traced by the percolating water is known as creep length and the head loss per unit creep length is known as hydraulic gradient or percolating coefficient.
If the discharge required for different crops is 0.6 cumecs in the field and the capacity factor and time factors are 0.8 and 0.5 respectively, then what is the design discharge of the distributary at its head?
Detailed Solution for Test: Irrigation Engineering- 2 - Question 16
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- 2 - 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.
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