Paper-II
Section A

1.Write short notes, not exceeding 150 words each, on any Four of the following:

a.Radiator Pressure cap

b.Starting aids used in diesel tractors

c.Paddy drum seeder

d.Savonius wind rotor

e.Solar photo-voltanic cells

Answer the following questions

a.Draw P-V diagram of an ideal diesel cycle indicating the different events. Mark the swept. Volume and clearance volume in the diagram. Also draw an actual P-V diagram and explain the causes for its deviation from the ideal cycle for a 4-stroke cycle engine

b.With the help of a diagram, explain the working of a conventional differential as used in the rear wheel driven tractors. What is the function of a differential lock

c.Explain with a diagram the working of bypass type lubricating oil filtering system as adopted in modern tractor engines

Answer the following questions

a.Explain the working of a power operated flywheel type forage chaffcutter. How is power transmitted to the feed rolls 7 How do you determine the theoretical capacity of the chaffcutter

b.What is producer gas? With a schematic diagram explain the working of a down draft type gasifier

c.With a neat sketch, explain the working of a tractor mounted hydraulic sprayer. How does a hollow cone nozzle differ from the solid cone nozzle? How do you determine the field capacity of the sprayer

Answer the following questions

a.If a farmer can hire a 7.5 kW power tiller with operator for Rs. 85 per hour for tilling operation, how many hours per year must he operate to justify the purchase of this power unit? Take initial cost of powertiller with rotavator Rs. 20, 000; useful service life 15 years diesel fuel consumption 1 5 liters/hour; and operator's wages Rs. 75 per day. Assume any other data if required

b.Explain the procedure to select a suitable size of electric motor for running a centrifugal pump for lifting water from shallow well

c.Draw the sectional view of a fixed dome type biogas plant and show the different components. Calculate the required size of digester for a 3 in3 capacity biogas plant using retention period as 50 days

Section B

Write short notes, not exceeding 150 words each, on an low of the following:

a.Homogeization of milk

b.Extraction of oil from rice bran

c.Strain gauge torque sensor

d.Vapor compression refrigeration system

e.Computer memory

Answer the following questions

a.Calculate the amount of moisture evaporated from 100 kg of paddy grain from drying it from an initial moisture content of 22 per cent (wet basis) to final morsture content of 14 per cent on wet basis

b.Explain the working of an absorption type hydraulic dynamometer. How can this dynamnometer be used to measure the brake power of an engine?

c.What are the desirable qualities of packaging materials for foods? Give most commonly used packaging materials, one each for milk, butter, baked foods and tea and write their properties

Answer the following questions

a.What is deep bed drying? Explain with a diagram the process of drying paddy grains using this technique

b.With a block diagram, explain the generalised data acquisition system. What are the factors that decide the configuration and sub systems of data acquisition system

c.What is milk sterilisation? How is it different from pasteurization? With a flow chart, explain the preparation of in-bottle sterilized milk

Answer the following questions

a.Explain the production of milk powder using a spray dryer. Compare the milk prepared from whole milk powder with the fresh milk in terms of shelf life and nutritive value

b.What are thermocouples? How can it be used to measure the temperature of a hot body? Write two most commonly used materials for thermocouples and give their temperature ranges

c.Explain the working of a bucket elevator for handling small grains. How do you determine the theoretical power requirement of a bucket elevator