Paper-II
Section A

1. Answer any four of the following, each not exceeding 150 words

a. A tractor weighing 1600 kg is climbing up a slope of 10.05 per cent with a drawbar pull of 274.1 kg parallel to the slope. The travel speed along the slope is 3 kmph and the coefficient of rolling resistance is one per cent. Determine the power required for moving up of the tractor

b. A cultivator has a draft of 270 kg and operating speed of 5 kilometers per hour. Total width of the cultivator is 180 cm and its field efficiency is 80 per cent. Calculate the following:

i.Horsepower

ii. Time to till one hectare.

c. Write general energy equation. With specific reference to internal combustion engines, find an expression for energy change of a constant volume process

d.Define or explain briefly the following:

i.Torque rise

ii. Power factor

e.Write down the following:

i. Minimum wind velocity for working of a windmill

ii. Material used to make solar cells

iii. Upper safe exposure level to noise for continuous operations

iv. Furrow opener suitable for mulching

v. Main combustible constituent of biogas

2. Answer the following questions

a. Describe type of furrow cross-sections obtained while using

i. moldboard ploughs

ii. disk ploughs

iii. indigenous ploughs

b. Explain the complete procedure for calibrating a seed drill. State reasons for calibration necessary for a seed drill before use. Write function of a combination drill

c. Describe some common motor troubles and their remedies. Give points of considerations for the selection of electric motors

3. Answer the following questions

i.Suggest improved farm machines to harvest

ii.Maize

ii. Wheat

iii. Potato

iv. Napier grass

v. Lucern

vi.Jowar (Sorghum). Explain the reasons for your recommendations

b. Explain with the help of a diagram, the working principles of fuel supply. Write importance of a fuel mixture and air cleaner With a neat sketch, describe the construction of a DC generator. How does it differ from that of DC motor

4. Answer the following questions

a. Describe various devices used in seed metering. How is the seed metered in-

i. a seed drill

ii. a planter

iii. the seeding attachment of the cultivation

b. A farmer has to harvest 2.5 hectares of grass by means of a 2 m mower being operated at 4 kmph. How much time it will take to harvest the same if the field efficiency of mower is taken as 80 per cent? Explain the terms registration and alignment as applied to the cutter bar of a mower, and state how these adjustments are done

c. Describe the construction and operation of a shunt motor starter. Draw a diagram of all its internal connections

Section B

1.Answer the following questions

a.Explain falling rate period of drying process including rate of heat transfer of material and falling rate drying mechanism

b. With a neat diagram, explain the deep-bed drying arrangements and Psychrometric Chart used for drying

c.Explain program transfer and problem analysis in Agricultural Engineering

2. Answer any four of the following, each not exceeding 150 words:

a. Draw a block diagram of operations for a rice-processing center from receiving up to final storage. Label the diagram and the processes clearly

b.List the main components of a cream separator. Explain the process of cream separation with two most important precautions for good cream separation

c. Write down the following:

i. Instrument used to measure acceleration

ii. Quantity measured with stroboscope

iii. Expression to define decibel

iv. Henderson's equation for grain isotherm

v. The maximum recommended angle of inclination for bucket elevator.

d. Using a microprocessor and appropriate circuits, it is proposed to build on-board control system for operation of a grain combine. The control is to maintain a constant rate of crop harvesting by controlling forward speed and height of cutting at a fixed moisture content of the grains. In case the grain moisture exceeds the limit, the combine is to sound a warning and stop forward movement. Show the schematic design, including elements of the control system. To elaborate on the working of the design, a block diagram may be used to show the functioning of the system

e. Define or briefly explain the following:

i. Equilibrium moisture content

ii. Pasteurization.

3. Answer the following questions

a.Explain properties of agricultural materials used in solving different processing problems in grain

b. Describe indirect dryers with separate collector and drying chamber. Give expression for the efficiency of solar energy collector.

c. Explain basic laws for operating solar dryers and solar energy utilization in crop drying

4. Answer the following questions

a. Explain solar grain drying system. Show the working of a double air pass solar grain dryer. Give points of consideration in the selection of solar energy dryers

b. Explain the characteristics of any three of the following:

i. Oscillators

ii. Multi-vibrators

iii. Amplifiers

iv. Rectifiers.

Explain methods of size reduction. Give different laws for energy requirement in size reduction