GATE 2017-2018 :: GATE Agricultural
- A 100 ha watershed received rainfall at a rate of 5 cm h-1 for 2 hours. If the runoff generated by the storm was at the rate of 1 m3 s-1 for 10 hours, the runoff coefficient for the watershed would be
- A 10 ha field has 1.2 m deep layer of sandy loam soil underlain by sandy soil up to a depth of 5 m. A pre-irrigation rainfall brings moisture content of the top 0.3 m layer to its field capacity. The moisture content of rest of the sandy loam layer remains at permanent wilting point. The volumetric moisture content at field capacity and permanent wilting point are 32 and 16%, respectively for the sandy loam soil. The field is irrigated with a stream size of 240 L s-1 for 24 hours. Considering the drainage from the sandy loam soil as deep percolation, application efficiency and deep percolation ratio in percent respectively are
- A watershed, with an area of 360 km2, has a triangular shaped 4-h unit hydrograph with a base of 50 hours. The peak discharge of direct runoff hydrograph due to 3 cm of rainfall-excess in 4 hours from the watershed in m3 s-1 is
- A rotary dryer is used to dry 1200 kg h-1 of paddy containing 30% moisture (wet basis) to give a product containing 15% moisture (wet basis). Alternately, a portion of the dry product may be recycled and mixed with the fresh feed such that the mixed feed enters the dryer with moisture content of 20% (wet basis). The moisture evaporation rate without recycle and the paddy recycle rate in kg h-1 respectively in the dryer are
- The work index of a material is 6.25. If 80% of the feed and 80% of the product pass through IS Sieve No. 340 (3.25 mm opening) and IS Sieve No. 40 (0.42 mm opening), respectively, the power consumed in kW to crush 5000 kg h-1 of sorghum is
- In a screen separator, the mass flow rates of feed, overflow and underflow are 150, 140 and 10 kg h-1, respectively. Mass fraction of material in the feed and overflow are 0.9 and 0.96, respectively. The effectiveness of separation in percentage is
- A milk fat globule of 2 μm diameter is rising in whole milk of density 1030 kg m-3 and coefficient of viscosity 10-3 Poise. If the fat density is 950 kg m-3, the time needed to rise 10 mm for this fat globule in min is
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A 9 * 20 cm fluted roller type seed drill is operated at a forward speed of 3 km h-1 in a field of size 120 m * 90 m. The effective ground wheel diameter of the seed drill is 0.5 m and the ratio of ground wheel rpm to the fluted roller rpm is 2. For one complete rotation of each fluted roller, 6.8 g seed is transferred from the seed box to the seed tube. The average time taken for each turn while operating length-wise is 50 s and the total time wasted in refilling the seed box for sowing the entire field is 40 min. The seed rate in kg ha-1 will be
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A 9 * 20 cm fluted roller type seed drill is operated at a forward speed of 3 km h-1 in a field of size 120 m * 90 m. The effective ground wheel diameter of the seed drill is 0.5 m and the ratio of ground wheel rpm to the fluted roller rpm is 2. For one complete rotation of each fluted roller, 6.8 g seed is transferred from the seed box to the seed tube. The average time taken for each turn while operating length-wise is 50 s and the total time wasted in refilling the seed box for sowing the entire field is 40 min. The actual field capacity of the machine in ha h-1 is
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Specific heat capacity of dry air and water vapour are 1.005 and 1.88 kJ kg-1 K-1, respectively. In an energy conserving system, 1 kg s-1 air at 300C with constant absolute humidity of 0.02 kg water (kg dry air)-1 is heated up to 650C. Water at the wet bulb temperature of air is then sprayed into the air so that the final temperature of the air-water vapour mixture is 400C. Latent heat of vapourization of water at 700C and 400C are 2334 and 2407 kJ kg-1, respectively. The thermal energy supplied per second during heating in kW is
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