Maharashtra State Board of Technical Education 2012-6th Sem Diploma Civil Engineering for Subject Micro Irrigation (Elective)(12226) - Question Paper
MSBTE Sample ques. Paper for Civil Engineering
Sixth Semester
Subject Micro Irrigation (Elective)(12226)
Scheme - E
Sample Question Paper
Course Name : Diploma in Civil Engineering Course Code : CV Semester : Seventh Subject : Micro Irrigation (Elective)
Marks : 100
12226
Time: 3 Hrs
Instructions:
1. All questions are compulsory.
2. Illustrate your answers with neat sketches wherever necessary.
3. Figures to the right indicate full marks.
4. Assume suitable data if necessary.
Q.l (A) Attempt any THREE of the following 12 Marks
a) State four difficulties in Micro irrigation.
b) Define: i) Field capacity ii) Permanent Wilting Point iii) Readily available moisture, iv) Equivalent Moisture
c) State any four limitations of sprinkler irrigation.
d) State any two components & functions of micro sprinkler.
(B) Attempt any ONE of the following 06 Marks
a) Define evapotraspiration? How it is determined by Penman method?
b) Draw layout of portable type sprinkler irrigation system.
Q.2 Attempt any FOUR of the following 16 Marks
a) State any four advantages of micro irrigation.
b) State any four benefits of water audit.
c) Depth of crop root zone in a soil is 200 mm & density of soil is 16 KN/ m3. Field capacity of soil is 23 % where as wilting co-efficient is 8 %. If the soil moisture content is 12 %, find the depth of irrigation water per meter to be supplied
& water holding capacity of soil per meter.
d) Compare sprinkler & drip irrigation on any four points.
e) State design procedure of main & submain in sprinkler irrigation system.
Q.3 Attempt any FOUR of the following 16 Marks
a) Draw layout of drip irrigation system.
b) Write two advantages and two limitations of fertigation.
c) State any four points regarding selection of pumps for drip irrigation scheme.
d) Determine the frequency of irrigation and discharge of a sprinkler suitable for following requirements:
(i) Type of crop - Cotton
(ii) Area of crop - 6 acre
(iii) Areas Peak moisture requirement for cotton =3.81 mm/day
(iv)Total Moisture requirement of crop = 80 mm
(v) Pump operation Hours =15 hrs.
e) Write two advantages and two limitations of drip irrigation
Q.4 A) Attempt any THREE of the following 12 Marks
a) Explain estimation of depth of irrigation on the basis of Soil Moisture regime concept
b) Describe the process of fertigation by using venturi.
c) Why maintenance of filters and drippers is necessary for drip irrigation?
d) State the factors to be considered for selection of rapid sand filter.
Q.4 B) Attempt any ONE of the following 06 Marks
a) Explain any three Irrigation efficiencies with all the parameters involved.
b) Design specific discharge rate of lateral and submain suitable for following field requirements:
l) Type of crop - Banana
ii) Area of crop -150 in x 150 m on sub main
in) Spacing of plant = 1.5 x 1.5
iv) Discharge per dripper = 4 LPH
Q.5 Attempt any FOUR of the following 16 Marks
a) Explain how input data is used to design sprinkler irrigation system?
b) How' the maintenance of dnp irrigation system is carried out?
c) Explain any two methods of Fertilizer injection.
d) Explain any two methods of cleaning filters in fertigation.
e) State any four limitations of sprinkler irrigation system.
f) State and explain how Hazen-William equation is used to determine frictional losses in design of main and sub main m sprinkler irrigation system.
Q.6 Attempt any TWO of two following 16 Marks
a) Determine the time of irrigation required to apply 5 cm of irrigation water to 10 ha.
of land at the rate of 12 mmlir. Two lateral lines of 108 m long are spaced at 12 m apart. Nme sprinklers are spaced 12 m interval on each lateral lme. Calculate the system capacity & number of days required to complete one irrigation assuming 8 operating hours per day. Assume water application efficiency 70 %.
b) How following factors will affect the designed discharge of drippers.
i) Evapotranspiration (ii) Ram Fall (iii) Wind Velocity
(iv) Temperature (v) Crop (vi) Soil
c) Calculate the power of Pump in KW suitable for following data:
i) Rate of Flow required = 8 LPS
ii) Suction head = 2.0 m in) Deliver Head =5.0 m
iv) Loses in main and sub main = 2.5 m
v) Fitting and other losses = 2.0 m
vi) Operatmg pressure = 25 m
vii) Efficiency of pump = 80%
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| Earning: Approval pending. |
