Indian Agricultural Research Institute Environment Indian Forest Service Agricultural Engineering - Paper I University model question papers



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Posted Date: 26 Aug 2009      Posted By:: Ramesh Kumar Gupta (RKG)    Member Level: Gold  Points: 5 (₹ 1)

2007 Indian Agricultural Research Institute Environment Post Graduate Diploma Natural Resources Indian Forest Service Agricultural Engineering - Paper I University Question paper



Course: Post Graduate Diploma Natural Resources   University/board: Indian Agricultural Research Institute





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

(b) Define the runoff. What are the factors that affect the runoff? (10)

(c) Calculate the total capacity of the pond required in deep black soils for 10 ha watershed if the mean annual rainfall is 500 mm and the mean annual runoff is 10%. Assume siltation rate of 5 tonnes/halyear and a desiltation period of 6 years. The bulk density of soil under wet conditions is 1.2gram/cc. (10)

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

(e) Give 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 different components of a permanent soil conservation drop structure. What role is played by each 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 error in the measurement of rainfall from the Syphon and Float type of recording gauges. (10)

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

3. (a) What are 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 each type will be suitable. (10)

(c) What are 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? Explain the mechanism of Stevens ‘F' type stage level recorder. (10)

SECTION B
5. Answer any four subparts not exceeding 150 words for each subpart
(a) Classify different methods of irrigation stating suitability of each under different 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 section used for lining an irrigation channel has the following specification:-
Bottom width 17.5 cm, Top width 20 cm and. height 17.5 cm. Calculate the carrying capacity of the section 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 problems 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 different materials used the lining the water course with their relative merits and demerits. (10)

(c) Mention four types of irrigation efficiency with expressions to calculate each. (10)

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

7. (a) Draw a neat diagram showing different types of aquifers. Indicate and explain the various types of wells that result from these aquifers. (15)

(b). An irrigation stream of 30 liters per second is diverted to a check basin of size 12 m × 10 m. The water holding capacity of the soil is 15%. The average 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 assumed 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 different types of tile drainage system with suitable diagram. (10)

(b) What is a greenhouse? How does the greenhouse effect occur inside the greenhouse Give some 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)





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