AGRICULTURAL ENGINEERING – 2002,PAPER – I

                                Time Allowed: Three Hours    Maximum Marks:  200

Candidates should attempt Questions 1 and 5 which are compulsory, and any THREE of the remaining questions, selecting at least ONE question from each Section. Assume suitable data. If considered necessary, and indicate the same clearly. 

SECTION A 

1.       Answer any four sub-pars not exceeding 150 words for each sub-part:

      (a)     Design a 350 m long graded bund in sandy loam soil on a land having an average slope of 3 %. The bund channel is formed by embankment onle. The horizontal distance between two abject bunds is 70 m. The land is having cultivated crop. The bund channel is on a grade of 0.1% for the first 100 m, 0.2% for the next 100 m and 0.14% for the rest. Assume runoff coefficient 0.3 & rainfall intensity as 20 cm/ hr.

     (b)      Mention the use of air photo interpretation in agricultural application and forest conditions.

    (c)          Define farm pond. Show different types of ponds used in agriculture. Calculate capacity of a pond given the area enclosed by different contours at the site as follows:

Contour value (m)            Area enclosed (m²)

260                                             150

261                                             250

262                                             220

263                                             210

264                                             215

265                                             180

266                                             158       

    (d)      Determine the size of concrete pipe needed in a drop inlet spillway for a peak flow of 2 m³/ sec and total head of 4 m. determine the slope to be given to the pipe to flow full. Length of pipe is 14 m, entrance loss co-efficient K is 0.05 and friction loss co-efficient k is 0.04.

    (e)       Discuss methods for gully control.

2.                                (a) What is cropping system? Write its benefits agriculture.

                    (b)   What is the purpose to calculate land grading? List different methods of land grading.

                    (c) Classify the land use capability depending on slope, List soil conservation measures for each class of land.

                    (d)   How can soil losses be measured?

                    (e)    Explain damages caused by water erosion.

3.       (a)  Show components and write uses of a chute spill way. Describe its design features.

                    (b)  Design notch dimensions of a waste weir to discharge excess runoff from a contour bunded area on a land having an averages slope of 3%. Assume that the most severe rain occurring during the recurrence interval lasts for 3 hours. The rainfall intensities are such that 15 cm of rain occurs during the first hour 18 cm during second  hour and 16 cm during third hour. Infiltration and interception amount to 6 cm water during the first 30 minutes and 5 cm during the nexr 30 minutes. The infiltration then becomes constant at 8 cm/ hour. Calculate

 (i)                  Storage capacity of bund when water surface is at the crest level of the weir.

(ii)                Time required filling the bung up to the crest level of the waste weir. Assume horizontal spacing of bund = 60m, length of bund = 400 m, bund top width = 60 cm, bund height = 60 cm, side slope = 1.5:1 crest level of weir = 30 cm above ground level.

4.       (a) define the following terms:

             (i)                  Strip Cropping  

            (ii)                Types of terraces

            (iii)               Grassland Management

            (iv)              Effects of vegetation on soil erosion

            (v)                Waste weir types

                 (b) Explain about geologic and soil mapping.

                (c)  Differentiate between dry boulder spurs and permeable spurs.