Indian Agricultural Research Institute (IARI) 2007 Post Graduate Diploma Natural Resources Indian Forest Service Agricultural Engineering - I - Question Paper

PAPER - I : part A
1. ans any 4 subparts not exceeding 150 words for every subpart :
(a) Mention the causes of soil erosion in India. What measures you will suggest to control the soil erosion ? (10)

(b) describe the runoff. elaborate the factors that affect the runoff? (10)

(c) compute the total capacity of the pond needed in deep black soils for 10 ha watershed if the mean annual rainfall is 500 mm and the mean annual runoff is 10%. presume siltation rate of five tonnes/halyear and a desiltation period of six years. The bulk density of soil under wet conditions is 1.2gram/cc. (10)

(d) elaborate the runoff samplers ? How they are important in soil and water conservation research work? (10)

(e) provide a brief note about the extent of wind erosion in India. How the wind erosion is harmful to the agricultural lands ? (10)

2. (a) Show with a diagram the various components of a permanent soil conservation drop structure. What role is played by every component? (10)

(b) State the Rational formula for estimating the peak rate of runoff from the small watersheds. List out the basic assumptions made under the Rational formula. (10)

(c) Mention the possible reasons of fault in the measurement of rainfall from the Syphon and Float kind of recording gauges. (10)

(d) Illustrate with figure the rainfall trend in India and how they influence the quantum and the mode of runoff generation. (10)

3. (a) elaborate the steps involved in the design of the contour bunds ? How these parameters can be estimated ? (10)

(b) Classify Bench Terraces and write the conditions under which every kind will be suitable. (10)

(c) elaborate the sheet and nil erosions and how they are harmihi to the agricultural lands ? (10)

(d) Write short notes on :
(i) Remote sensing and
(ii) G.I.S. (10)

4. (a) What points you will consider while selecting a site for the construction of a farm pond? (10)

(b) Write short notes on :
(i) Saltation and
(ii) Suiface creep in wind erosion. (10)

(c) Write in brief about the Erosion Index and Kinetic Energy of natural rainfall, their utility and measurement. (10)

(d) What is the use of water stage level recorder? discuss the mechanism of Stevens ‘F’ kind stage level recorder. (10)

part B
5. ans any 4 subparts not exceeding 150 words for every subpart
(a) Classify various methods of irrigation stating suitability of every under various situations of crop, water and soil conditions. (10)

(b) What is the Booster Pump ? What role does it play in a sprinkler irrigation ? (10)

(c) List out the characteristics of centrifugal pumps. (10)

(d) A prefabricated concrete channel part used for lining an irrigation channel has the subsequent specification:-
Bottom width 17.5 cm, Top width 20 cm and. height 17.5 cm. compute the carrying capacity of the part when the channel slope is 0,2%. Take the Manning’s ‘n’ as 0.01. (10)

(e) Write about the suitability of the Parshall flume over Weir as a flow measuring device: (10)

6. (a) Write in brief about the management of clogging issues in drip irrigation. (10)

(b) What do you understand by the term ‘lining of irrigation channels’ ? What is the necessity for lining the irrigation channels ? State the various materials used the lining the water course with their relative merits and demerits. (10)

(c) Mention 4 kinds of irrigation efficiency with expressions to compute every. (10)

(d) elaborate the requirements of a good storage structure for the scientific storage of foodgrains? (10)

7. (a) Draw a neat diagram showing various kinds of aquifers. Indicate and discuss the different kinds of wells that outcome from these aquifers. (15)

(b). An irrigation stream of 30 liters per 2nd is diverted to a check basin of size 12 m × 10 m. The water holding capacity of the soil is 15%. The avg. soil moisture content in the root zone prior to applying water is 7%. How long should the irrigation stream be applied in the basin to replenish root zone moisture to its field capacity, assuming no loss, due to deep percolation ? The depth of root zone may be presumed 1.0 in. The apparent specific gravity of the soil is 1.5. (15)

(c) What is the function of a foot valve in a centrifugal pump? Mention principal causes of pump troubles with remedies.(10)

8. (a) Mention various kinds of tile drainage system with suitable diagram. (10)

(b) What is a greenhouse? How does the greenhouse effect occur inside the greenhouse provide a few salient features of a computerised control greenhouses. (10)

(c) Write a note on the use of plastic pipes for drainage. (10)

(d) Write in brief about the utility of pen barns on the dairy farm. (10)

Earning:   Approval pending.