No. ofPrinted Pages: 4
CS-80/06

AGRICULTURAL ENGINEERING
Paper-I
Time: 3 Hours Full Marks: 300
Note: Candidates should attempt Question No. 1 from Section-A and Question No. 5 from Section-B which are compulsory, and any three of the remaining questions, selecting at least one from each Section.
All questions carry equal marks.
SECTION-A
I. Answer a ny three of the following out of and
Differentiate between a Gunter's chain and an Engineer's chain. State
relative advantages of each. 8
In levelling between two points A and B on opposite banks of a river,
the level was set up near and the staff readings on A and B were
1.285 and 2.860 m respectively. The level was then moved and set up
near B and the respective readings on A and B were 0.860 and 2.220.
Find the true difference of level between A and B. 12
A pump with 15 cm suction pipe and 12 cm delivery pipe has an
efficiency of 80% and is driven by a 11 kW (15 m.h.p. motor). A
differential monometer connected to suction and delivery sides shows a
maximum pressure head of 9.15 m of water. Predict the discharge of
water through the pump. 10
When an agricultural land is said to be waterlogged Discuss the
harmful effects of waterlogging and the various antiwaterlogging
measures. 10
How do you arrive at a correct depth of irrigation to be applied to a crop
at a particular time? 8
Winter maize is grown in a sandy loam soil having infiltration rate of
50 mm/hr. The field capacity and wilting point of the soil are 22% and
11% respectively. Crop is irrigated after 50% of the available moisture
is depleted. The furrow is constructed along a slope of 0.1%. Apparent
specific gravity of the soil is 1.55. Design the furrow irrigation system. 12
Show that for a given discharge specific energy is minimum when
Q2T/gA3 is unity. Here T is the water surface width. Obtain expressions
for the critical depth and minimum specific energy for a rectangular
channel of area A. 10
Show that a trapezoidal channel with given area and side slopes Z:1 is
most efficient when hydraulic radius is half the depth of flow. 10

CS-80/06 1 P.T.D.

2. In a tile drainage system the drains are laid with their centres 1.5 metres
below ground level. The impervious layer is 9.0 metres below the
ground level and the average annual rainfall in the area is 80 em. If
of the annual rainfall is to be drained in 24 hours to keep the highest
position of the watertable to 1 metre below ground level, determine the
spacing of the drainpipes. Coefficient of permeability may be taken
as .001 em/sec. 10
If 100 sample cans are uniformly spaced in the area covered by four
sprinklers and the average depth of water caught in a given time is 1.25
em with the average variation from the mean 0.2 em, what is the
uniformity coefficient Assuming that the infiltration rate was not
exceeded and the water did not penetrate below the root zone, what is
the application efficiency? 10
Why is the reciprocating pump called a positive displacement pump
Explain the essential parts and working principle of the pump. 10
Design the most economical trapezoidal section of channel to carry a
discharge of 10 m3/s in a bed slope of 1 in 3000. For stability the side
slope is 1.5 1 and the value of Manning's n is 0.025. 10
What are the benefits of subsurface drainage Under what situation
subsurface drainage is preferred over the surface drainage system? 10
In a subsurface drainage system, the drains are located at spacing of 30
m and the drainage line is 300 m long with a slope of 0.25%. What size
of tiles will be required if the drainage coefficient is 3 cm 10

3. What are the advantages and limitations for conveyance of irrigation water through pipeline What parameters should be included in the design of a pipeline conveyance system? 10
Discuss the adaptability and advantages of the drip irrigation system. What are the different components of the system? 10

Describe the advantages and limitations of a sprinkler method of irrigation. What are the different types of sprinklers used in the field? 10

The root zone depth of a particular crop is 1.20 m. The soil moisture percentages at field capacity and at permanent wilting point are 25 and 8 respectively. The relative density of the soil is 2.65 and the porosity is 40% At a time when the soil moisture is a farmer applies 300 mm of water depth. What percentage of this applied water will go as a waste? 10


What is local attraction? How is it detected and eliminated? 8


In an old survey made when the declination was 4° the magnetic bearing of a given line was 210°. The declination in the same locality is now 10° what are the true and present magnetic bearings of the line? 12
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4. What are the differences between infiltration, percolation and seepage? How is the hydraulic conductivity defined? 10
A Control sluice spanning the entry of a 4.0 m wide rectangular channel having a mild slope admits water at the velocity of 16.0 mls. Find whether a hydraulic jump is expected in the channel downstream from the sluice. 10
Describe the different components and working of a parshall flume. What are its relative advantages and disadvantages? 10
A rectangular orifice has a length of 15 cm. The depths of water on the upstream and downstream sides are 20 cm and 10 cm respectively above the bottom of the orifice. Calculate the discharge through the orifice. 10
Describe various demerits of each. methods of contouring. Discuss the merits and 10
Sketch the streamlines represented by =Xl y2 and =Xl y2 showing the direction of flow in each case. Also find out the velocity and its direction at 10
SECTION-B
5. Answer any three sub-parts not exceeding 200 words for each sub part:
Explain the importance of land use capability classification. 6
How capacity of a pond can be detennined Calculate the capacity of a pond if area enclosed by different contours are as follows: 8

SI.No.
I
2 3 4 5 6
Contour value
245
246
247
248
249
250
Area enclosed
275
298
325
356
383
417
What is the function of a grassed waterway? Briefly explain its design
procedure. 6
Explain properties and constituents of cement. Classify cement and
make brief comments on them. 10
What are the different types of dairy bams? list the components of a
standard dairy bam. S
Write a very brief note on deep litter poultry house. S
Discuss the necessity of gravel packing in a tube well. 10
Explain reverse rotary drilling method of tube well construction. 10

C8-80106 3 p:r.o.