Paper-II

Section A
1. Answer any four of the following each not exceeding 150 words:
a. What are various sources of Farm Power? Explain briefly their status in India with their advantages and disadvantages
b. Describe the working principle of Carburetor in IC engine with the help of neat sketch. Explain as how the choke valve helps in starting the engine
c. Elaborate the working principle of the Centrifugal Governor in a Tractor. How does it help to maintain speed under overloading situation during actual work
d. What would be the maximum safe turning speed of a four wheel tractor having weight 2T, centre of gravity 1 m ahead the rear axle and 75 cm above the ground? Wheel base is 2.2 m and wheel spacing is 1.6 m. The distance between centre of rotation and centre of gravity is 4 m
e. An engine operates a thresher at 810 rev/mm requiring a torque of 7 kg-m. Calculate the threshing load in hp/h on the engine
2. Answer the following questions
a. Draw a neat sketch of Tractor Transmission System. Elaborate the function of differential along with design details
b. Describe the functioning of strain gauge type drawbar dynamometer
c. Calculate the horsepower of a four stroke four cylinder IC engine having diameter of the cylinder 120 mm and length of the stroke 150 mm. The engine is running at 1000 rev/mm at mean effective pressure of 7 kg/cm2
d. Determine the theoretical maximum drawbar pull of a track type tractor weighing 3500 kg with tracks 35 cm wide and. 1.65 m long. Soil parameters may be assumed as follows
Cohesion 0.15 kg/cm2
Angle of internal friction, i 30°
Cohesive modulus of deformation, KC 3
Friction modulus of deformation, Ki 0.5
Coefficient of wheel sinkage, n 0.2
Assume that the lugs of tractor to be such that the soil is sheared off in a plane area at the ends of the lug
3. Answer the following questions
a. What are the basic differences in fuel supply system of petrol engine and diesel engine? Support your answer with neat sketch
b. A three bottom 40 cm M. B. Plough costs Rs. 11000.00 and two bottom 40 cm M. B. Plough costs Rs. 9000.00. The operating speed of both the ploughs is 4.5 kmph and expected field performance efficiency is 80 per cent. If the cost per hectare for tractor unit remains same, what would be the size of land for which both the ploughs will be equally economical? Take labour charge as Rs. 50 per. Day of 8 hours. Make necessary assumptions wherever required
c. A power tiller costing Rs. 20, 000 is expected to have useful life of 10 years and trade in value of 10% of the initial cost. Calculate the depreciated value after six years by all four methods, i.e..
1) straight line method
2) declining balance method
3) sum of the digits method
4) sinking fund method
4. Answer the following questions
a. What do you mean by Valve timing diagram of a four stroke IC engine. Describe the occurrence of events in a four cylinder four stroke engine in a tabular form having standard firing order for proper balancing
b. A farmer purchased a 35 hp tractor at the cost of Rs. 40, 000.00 with an annual interest of 12%. Considering the life of the tractor as 10 years and annual use as 1000 hours, calculate cost of use of tractor per hour if it is engaged for hiring purpose
c. What are the theoretical field capacity in hectare per hour and per cent time loss for 4 and 6 row corn planter st for 600 mm rows. The row length is 400 m and forward speed of each is 6 km/h. Assume the time losses of 5 second per row for turning at each end and 60 second for filling the seed and fertilizer cans at every second round

Section B
5. Answer any four of the following each not exceeding 150 words.
a. Explain agricultural processing with its objectives and major operations performed on various crops
b. Show basic components of an extruder and explain extrusion process
c. Explain screening and factors that affect screening performance
d. What are the various input devices of the computer? What is difference between OCR and OMR
e. Draw the basic block diagram of a temperature measurement system for a dryer using microprocessor. Briefly describe its different sections
6. Answer the following questions
a. Describe the main components of a power thresher used for threshing wheat. What are the recommended speed of threshing drum for wheat and paddy? Elaborate safety precautions for the power thresher
b. Describe the various hardware used in assembling of the CPU of a computer along with their specification. Also elaborate the various memory devices used in the computer
c. Explain the objectives, advantages and disadvantages of parboiling of paddy
d. Explain different methods of grain drying. What do you understand by thin layer drying and deep bed drying
7. Answer the following questions
a. Explain the process involved in making the milk powder
b. What are the different types of scanners used as an input device? Explain each of them briefly
c. With necessary process flow chart, explain the refining process of crude rice bran oil. Also give in detail the utilization of dc-oiled cake as by-product
d. Elaborate about resistance wire strain gauge. How gauge factor affects the performance of the strain gauge
8. Answer the following questions
a. It is found that the energy required to reduce particle from a mean diameter of 1 cm to 0.3 cm is 11 kJ kg-1. Estimate the energy required to reduce the same particles from a diameter of 0.1 to 0.01 cm assuming
1) Kick's law
2) Bond's law
b. What do you understand by the term ‘Hardware’ and ‘Software’ of the computer? What is their significance? Elaborate various types of software
c. During evaluation of an air screen grain cleaner with 2 screens the following were observed.
1) The impurities present in feed were 6.5%.
2) The impurities present in clean grain were 0.5% seed.
3) The outflow of blower contained 0.2% clean
4) The overflow of the 1st screen contained 1.0% clean seed.
5) The underflow contained 0.5% clean seed. Compute the cleaning efficiency of the cleaner and suggest how the efficiency can be improved