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Irrigation Engineering
Irrigation Engineering Objective
Quiz 1
Solution
Q.1.
Which of the following statement is incorrect about Expansive soils?
a) Expansive soils exhibit shrinkage and swelling properties
b) They have high compressibility and liquid limits with more than 50
c) Black cotton soil is the most common expansive soil in India
d) The lesser the swelling pressure, the more troublesome is the soil
Q.2.
The larger the thickness of CNS introduced over the expansive soil, the more will be the resulting swelling in soil.
a) True
b) False
Q.3.
What is the recommended value of CNS thickness to be used for lining over expansive soil with swelling pressure of 200-KN/m2?
a) 75 to 85 cm
b) 90 to 100 cm
c) 105 to 125 cm
d) > 125 cm
Q.4.
Safety ladders are generally provided on ___________
a) side slopes
b) bed slopes
c) anywhere on the canal
d) both side slopes and bed slopes
Q.5.
If the free swell index of soil is more thanthe soil may be expansive.
a) True
b) False
Q.6.
Safety ladders are provided in large irrigation canals to ______________
a) enable the fish to pass from one place to another
b) enable the cattle to cross the canal
c) enable the swimmers to get out of the canal
d) provide safe exit to avoid accidental drowning
Q.7.
CNS material shall be non-swelling with a minimum of ___________
a) 10 KN/m2 of cohesion
b) 15 KN/m2 of cohesion
c) 20 KN/m2 of cohesion
d) 30 KN/m2 of cohesion
Q.8.
Which of the following is incorrect about the identification of CNS material?
a) The CNS material can be identified by using A-line chart
b) The permissible deformation of the CNS layer is 20 mm
c) The swelling pressure should not exceed 10 KN/m2
d) The soil with liquid limit less than 30% and plastic index less than 15% is considered suitable
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