JNTU
JNTU B.Tech II FARM MACHINERY AND EQUIPMENTS-I Previous Question Paper (December - 2017 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Define the terms theoretical field capacity, actual field capacity and field efficiency?
Answer
Theoretical field capacity is the rate of field coverage that would be obtained if the machine were performing its function 100% of the time at the rated forward speed and covering 100% of its rated width. Actual field capacity is the actual rate of coverage by the machine, taking into account time lost for turning, refueling, and other interruptions. Field efficiency is the ratio of actual field capacity to theoretical field capacity, expressed as a percentage.
Calculate the actual field capacity and cost of operation (Rs/ha) for ploughing a 100 × 100 m uncultivable land using a 2 × 30 cm tractor operated M.B plough. The speed of operation is 4 km/h and time loss in each turning is 10%. Assume the fixed and variable cost for tractor and M.B plough assembly is Rs.250/- and Rs. 50/- respectively.
Answer
Given: Width = 2 × 30 cm = 0.6 m; Speed = 4 km/h; Time loss = 10% (Field efficiency = 0.9).
Theoretical Capacity = (Width × Speed) / 10 = (0.6 × 4) / 10 = 0.24 ha/h.
Actual Capacity = 0.24 × 0.9 = 0.216 ha/h.
Total Cost = Rs. 250 + Rs. 50 = Rs. 300/h.
Cost of operation = 300 / 0.216 = Rs. 1388.89/ha.
List out different types of shares in M.B plough?
Answer
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Write about the different types of Tillage?
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Define the terms swell and shrinkage in earth moving operation?
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A given soil weights 1662 kg/m³ in situ, 1438 kg/m³ loose and 1790 kg/m³ when compacted in a fill. Determine the percent swell and shrinkage for the soil.
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List out the various seeding/sowing methods?
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While calibrating a 2 × 50 cm seed drill in laboratory. The amount of seed collected for each revolution of ground wheel (100 cm in diameter) is 60 g. if the speed of operation is 3 km/h, calculate the amount of seed collected in 60 min. Assume the time lost during turning and other operations is 10 %.
Answer
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List out the various factors affecting drift in spraying operation?
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Classify the sprayer based on particle size?
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Part B
List out the different properties of materials? Explain any three of them?
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Write about the different steps in heat treatment process?
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Define farm mechanization. Write about the benefits and limiting factors of farm mechanization.
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What are the functions of M.B plough? Describe its different components with the help of neat sketches?
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Write about the important adjustments of a M.B plough?
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A two bottom desi plough which cuts the furrow in trapezoidal shape has a working depth of 15cm. The top and bottom width of furrow is 42 cm and 14 cm respectively. To pull this implement, a force of 400 N is applied at an inclination of 30° with vertical plane. The speed of operation is 5 km/h. Calculate:
- Unit draft (kg/m²)
- Size of tractor (in HP) to operate this implement. If the transmission and tractive efficiency is 80% and 30 % respectively.
- Area covered in a day of 8 hours. If the time loss during turning is 10%.
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Write about the classification of bulldozer.
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What are the factors affecting the output of a shovel?
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What are the different operations with bulldozer?
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Write about the classification of power shovel.
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Describe the process of calibration of seed drill?
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Calculate the seed rate per hectare of a 9 × 20 cm seed drill, whose main drive wheel is 120 cm diameter and total weight of grain collected in 20 revolutions is 0.5 kg.
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What are the different types of seed metering mechanisms?
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A two row horizontal plate potato planter with 0.6 m ridge spacing has 9 cups on each seed plate of 0.4 m diameter. The number of teeths on ground wheel and seed plate sprocket is 15 and 50 respectively. The diameter of the ground wheel is 0.5m. If the planter uses cut tubers each of 25 gram mass, calculate the seed rate in kg per ha?
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What are the basic parts of duster? Write about the care and maintenance of duster?
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A field sprayer is operated by a tractor at a speed of 6kmph. The sprayer boom has 15 nozzles spaced 45 cm apart. Time lost in turning tank filling are 10% and 5% respectively. Calculate the area covered per hour.
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What are the different types of sprayers? Describe the working of knapsack type sprayer with the help of a neat sketch?
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