No. of Printed Pages: 3
CS-81106
AGRICULTURAL ENGINEERING
Paper-II
Time Hours Full Marks: 300

Note: Candidates should attempt Question No. I 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
1. Answer any three of the following out of and

What are the different sources of farm power available in India? What is the economic importance of draught animals Describe the role of mechanical power in Indian agriculture. 20


An open V-belt drive transmits 12 kW from a 255 mm pitch diameter sheave operating at 1800 RPM to a 635 mm diameter flat pulley. The center distance between the input and output pulleys is 1000 mm. The V-belt sheave groove angle is 40°. The coefficient of friction for the belt and sheave is 0.2 while coefficient of friction between the belt and the flat pulley is 0.2. The cross section of the belt is 38 mm at the top and 19 mm at the bottom with 25 mm deep. Each belt weighs 1086 N/m3 and has an allowable tension of 900 N. Calculate the power transmitted by belt and number of belts required. 20


What are the forces acting upon a tillage tool Dlustrate the force representation for a disk blade. 20


A four cylinder, four cycle diesel tractor engine has a cylinder bore of 90 mm and piston stroke as lOO mm. The engine develops 43.5 kW at 2300 RPM when coupled to a dynamometer. At the same speed and with the fuel shut off, the tractor engine required 7.5 kW to motor it. During the test, when


43.5 kW was developed, the engine used 15.5 litre per hour of diesel that contain heat energy of 45 NJ/kg with fuel density of 0.835 kglIitre. Determine indicated mean effective pressure and engine thermal efficiency. 20
CS·81106 1 P.T.O.
2. Describe the working principles of internal combustion engines based on Olio cycle and Diesel cycle. 20
A power tiller costing Rs. 1,30,000 is expected to have a useful life of 10 years. Calculate the depreciated value after 5 years by different methods, assuming the trade value as 10% of initial cost. 20
A tractor with rubber tyre is pulling a plough at 6.5 kmlhour speed on level ground. The plough hooks large boulders and the unit stops suddenly. The coefficient of friction is 0.60 and the maximum possible drawbar power is 18 kW. The rear and front wheels weighs 14,700 N and 7,350 N. Calculate the kinetic energy to be absorbed in stopping the tractor. If the tractor is stopped in 15 cm by a drawbar spring without declutching, what is the increase in the drawbar pull above the maximum tractive ability? 20
3. What are the seed metering devices? Differentiate seed drill from planter. Describe the different steps for calibration of a seed drill. 20
A hydraulic sprayer filled with hollow cone nozzles is required to be calibrated for an application rate of 150 litreslha. The sprayer speed is 6.5 kmIh and the nozzle spacing is 50 cm. The orifice diameter of 0.787 mrn nozzle is rated at 0.473 litre/minute at 275 kPa pressure. Calculate the nozzle flow rate, pressure required to produce the desired nozzle flow rate and the droplet size at the desired flow rate, if the nozzle produces a VMD of 200 Nm at 1000 kPa. 20
Define alignment and registration of a culler bar. Describe the kinematics of a reaper with suitable diagram and notations. 20
4. Design a suitable biogas plant for cooking and lighting of a rural family of 4 adults and 2 minors. 20
A tractor having wheel base of 2.5 radius of rear wheel as 72 cm, radius of front wheel as 34 cm and width of rear wheel as 26 cm has a weight of 1800 kg. The weight carried by the front wheel is 650 kg. The weight carried by the front wheel when lifted to 46 cm from the ground is 540 kg. Calculate the centre of gravity of the tractor. 20
Describe the prospects and constraints of solar energy utilization in agriculture sector in India. llIustrate the working of a multi rack solar crop dryer. 20