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ARUNACHAL PRADESH PUBLIC SERVICE COMMISSION, 2008
AGRICULTURAL ENGINEERING

Full Marks: 200 Time: 3 Hours NOTE: Answer ANY TWO PARTS Marks are indicated against each question.
PART-A
1. Answer any five of the following: 5x4=20 What is hydrology? Mention different types of hydrologic data with their sources of availability. In an area, a weighing type of rain gauge of diameter has recorded 1.2 Kg of
precipitation in a day. How much is the depth of precipitation in inches? Discuss the methods of evaporation retardation. Define infiltration rate infiltration capacity and accumulated depth of infiltration
Draw a typical infiltration curve and mark fc and F on it.
Find out the consumptive use of the wheat crop for the month of January, if pan evaporation value for the month is 8.5 cm and the value of crop coefficient is 0.52. What do you understand by the term 'Stage of a river'? How will you measure stage
of a river using bubble gauge.
Describe the following with suitable examples:

Influent stream Ephemeral stream Effluent stream Perennial stream
2. Answer any five of the following: 5x4=20
The maximum depth of rainfall recorded in a watershed during 40 min. and 60 min. is 60 65 mm respectively. In this watershed, 20 Km2 area has cultivated sandy soil 0.2) and the remaining 30 Km2 area has cultivated clay soil What is the peak rate of runoff of this watershed, if time of concentration is 47.65 min?
What is current meter? Explain propeller current meter for measuring flow velocity. What is hydrograph? With the help of a neat sketch, describe the various
components of a hydrograph. Define a unit hydrograph. Describe the procedure to develop a unit hydrograph. What is 'Synthetic unit hydrograph'? Explain the Snyder method of synthetic unit
hydrograph development. What is gully erosion? Explain the phases of gully development in short. With the help of a neat diagram, explain the location of different permanent gully
control structures.
3. Answer any five of the following: 5x4=20 Define check dams and give their classification. Write the working principles of check dams in detail.
Determine the length of straight inlet and velocity of flow of water at toe (assuming 10% as head loss) for a Chute spillway carrying a peak rate of runoff as 2.33 cumec. The drop in gully is 3m.
Define stream bank erosion and write its various causes. How the sand dunes are formed? Explain wind break and shelter belt methods of reducing the wind erosion. What is bench terracing? Draw a neat sketch showing different types of bench terraces and explain them in brief.
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What is the functional utility of a grassed water way? Calculate the cross sectional area and the wetted perimeter of a parabolic shade grassed water way having depth of water as 30 cm and the top width as 1.1 m.
What is watershed and watershed management? Describe the causes of watershed deterioration.
4. Answer any five of the following: 5x4=20 Define attenuation and translation of the peak of hydrograph and show them on a neatly drawn figure. Draw a figure and discuss prism storage and wedge storage. What are the types of flood control measures that can be undertaken for a river system? Describe different types of spurs. On what basis will you differentiate diaphragm and zoned type of embankment? Explain the hydraulic filled metrod of earthen dam construction. What is farm pond and what for it is used? What you understand by soil-plant-water relationships? Discuss the physical properties of soil influencing the irrigation. Discuss, why is it necessary to measure the soil moisture? Name different methods of soil moisture measurement and tensometers. Differentiate between Gravity weil and Artesian well, Shallow wells and deep wells
Write the mathematical expressions to calculate water yield of wells from Confined wells, and Unconfined wells
5. Answer the following: 5x4=20 What is weI! log and what for it is used? Using Francis formula, compute the discharge of a rectangular weir, 50 em long with a head of 15 cm under the following conditions with no end or side contractions, and with two end contractions Explain in brief Diversion boxes, and Turnouts Determine the velocity and cross-sectional area of an underground pipeline using the following information dia of pipe 12 cm, Length of pipe 15 cm, Difference in elevation =2.5 cm, and Darcy's roughness coefficient, f =0.009
What do you mea by water front advance in border method of irrigation? List the factors influencing the rate of water advancement. What are the advantages of sprinkler method of irrigation over other methods of irrigation? What are the conditions under which land require drainage? Define drainage coefficient. Write short notes on the following: Tile drainage Mole drains
PART-B
1. Answer the following: 5x4=20 Why is it important to study the properties of building materials? List the physical
properties of building materials.
Write short notes on the following:


Strength Hardness Elasticity Plasticity
Explain the following characteristics of good bricks:


Texture and Compactness Hardness and Soundness


Water absorption Crushing Strength
Discuss the absorption test and compressive strength test of testing of bricks.



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Describe burnt clay perforated bricks and burnt clay paving bricks on the following points: Dimensions Tolerance
2. Answer the following: 5x4=20 What are the objectives of seasoning of wood? Describe the process of natural
seasoning in short.
Explain in brief, the following defects of timber:


Shakes Rindgell Upsets Knots
Suggest suitable timber for the following purposes:


Doors Railway Sleepers Piles Furniture Agricultural Equipments


Packing boxes Pegs Shuttering What is concrete and how is it made? Define water/cement ratio? How does it influence cement strength?


Write down the mix proportions and perspective characteristics strength of cement concrete for the following grades:
M10 M15 M20 M25
3. Answer the following: 5x4=20 What is the purpose of mixing in concrete? Discuss hand mixing. Write down equilibrium equations for different two dimensional force systems. Define
determinateness of a structure. Define estimate. Explain detailed estimate and abstract of cost. What factors govern the location of the farm stead on the farm? What are the different types of poultry houses being used in India? Describe in brief
brooder houses.
4. Answer the following: 5x4=20 Discuss the design of farm house on the basis of:
Bed room Drawing room Kitchen Store room Explain the important functions that take place within the septic tank. What is
soakage pit? Write short notes on pen barn and community barn. What do the farmers need to store grain on the farm? What are the requirements of a
good storage structure?
Explain 'Kothar' type of grain storage structure.

5. Answer the following: 5x4=2Q. What is Ohm's law? Draw the figures and mention the equations for calculating current from series circuit and parallel circuit. In what manner will you distribute the electrical power in rural area through A-C
motors?
Why do we need a starter in A-C motors? Explain star-delta-starter.
Enumerate the factors considered to select the right type of motor.
Write short notes on rural electrification.

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PART-C
1. Answer the following: 5x4=20 How many types of spark plugs are there? What do you mean by hot and cold plugs? Grawa line diagram of fuel system in tractor engine. Give the reason, why engine oil has to be cooled down? Describe plunger type of oil
pump. What are the main parts of water cooling system? Explain the working of radiator pressure cap. Under what conditions is the lJse of following tractors is justifiable
Track type tractor Garden tractor R6w crop tractor Rotary tillers
2. Answer the following: 5x4=20 What do you'mean by Chasis of a tractor? Describe chesisless tractor. What different parts constitute the differential of a tractor? What are the functions of a
differential? How does the steering mechanism of a wheel type tractor differ from that of the
crawler one?
What are the functions of tillage? Define minimum tillage.
Define horizontal and vertical suctions. What are their uses?

3.
Answer the following: 5x4=20 What are the important differences between a harrow and a cultivator, a leveler and a clod crusher What are the common methods used for sowing of crops? Write the functions performed by a seed drill. . Name the various types of furrow openers used in seed drills and under what

conditions are they preferred? What do you mean by registration and alignment of mowers? What are the possible reasons for getting unthreshed material from the combine?

4.
Answer the following: 5x4=20 How the sprayers are classified according to the volume of spray? Enlist the automizing device of a sprayer. Explain the working principle of anyone. Differentiate between sprayers and dusters. Name different types of shares and mould boards. What are their construction

materials?
Classify various land development machinery on the basis of their uses.


5.
Answer the following: 5x4=20 What do you mean by weeding? What are the various manually operated weeding


tools are used in Arunachal Pradesh?
Draw a neat sketch of centrifugal pump and label it.
What are the different types of impellers used in centrifugal pump? Under what
conditions are they used?
Explain the principles of threshing.
What are the various types of threshing cylinder? List the components of power
thresher.