UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR

SUPPLEMENTARY EXAMINATION

Date: 23-07-2021
III Yr. B.Sc. (Hons.) Agri.
Course Code: AG 301 (1+1)
Semester: II Sem. 2020–21
Subject: Protected Cultivation and Secondary Agriculture
Time: 2½ Hours
Maximum Marks: 50

I A. CHOOSE THE APPROPRIATE ANSWER (10 × 0.5 = 5.0)

1. Biomass is a form of ______ source of energy.

a. Non-renewable
b. Renewable
c. Commercial
d. Primary

2. Solar still is used for:

a. Cooking
b. Water heating
c. Distillation
d. Drying air

3. Combustion process is a ______ type of biomass conversion technology.

a. Biochemical
b. Thermochemical
c. Physicochemical
d. Biological

4. One kg of fresh cattle dung contains approximately ______ % of dry biodegradable mass.

a. 5
b. 8
c. 14
d. 18

5. Optimum temperature for anaerobic fermentation is:

a. 25
b. 30
c. 35
d. 40

6. Typical retention time of slurry in a biogas plant is:

a. 20 days
b. 40 days
c. 60 days
d. 80 days

7. One of the major sources of energy responsible for all other sources of energy is:

a. Solar
b. Wind
c. Geothermal
d. Biomass

8. Biodiesel is a biofuel produced by a process called:

a. Transformation
b. Gasification
c. Fermentation
d. Transesterification

9. The minimum wind speed considered useful for operating windmills for agricultural purposes is:

a. 5 km/h
b. 10 km/h
c. 20 km/h
d. 30 km/h

10. The temperature at which an oil fuel starts to solidify is known as:

a. Melting point
b. Cloud point
c. Flash point
d. Pour point

I B. MATCH THE FOLLOWING (5 × 0.5 = 2.5)

No. Column A Column B
11.Geothermal energya. Speed of combustion
12.Natural gasb. Self-starting
13.Solar photovoltaicc. Semiconductor material
14.Horizontal-axis windmilld. Commercial sources
15.Cetane numbere. Renewable source

I C. STATE WHETHER THE STATEMENTS ARE TRUE OR FALSE (5 × 0.5 = 2.5)

16. Energy is neither created nor destroyed.

17. Solar cookers cause greater loss of vitamins in food.

18. In a solar water heater, the collector should be at least four feet below the storage tank.

19. Denser oil contains more energy.

20. A solar photovoltaic cell is the heart of solar lighting.

II. DEFINE THE FOLLOWING (10 × 1.0 = 10.0)

21. Renewable energy

22. Biomass

23. Biogas

24. Define pyrolysis.

25. Syngas and producer gas

26. Briquette

27. Solar photovoltaic

28. Biomass gasification

29. Biodiesel

30. Melting point and pour point

III. ANSWER / DIFFERENTIATE ANY FIVE OF THE FOLLOWING (5 × 2.0 = 10.0)

31. List the advantages and disadvantages of renewable sources of energy.

32. Differentiate between KVC and Janata-type biogas plants.

33. Write the classification of biomass conversion technologies.

34. Explain briefly the factors considered for selecting a site for the construction of a biogas plant.

35. List the features of a solar fencing system.

36. Classify the different types of windmills.

37. Explain briefly about a solar street lamp with a neat sketch.

38. Explain briefly about solar ponds.

IV. ANSWER ANY FOUR OF THE FOLLOWING QUESTIONS (4 × 2.5 = 10.0)

39. Explain the principle of biogas production.

40. List the different types of solar collectors and explain briefly about a flat-plate collector with a neat sketch.

41. Explain the working of a solar water-heating system with a neat sketch.

42. Explain briefly the working of an updraft gasifier with a neat sketch.

43. Write a short note on briquetting.

44. Write the flowchart for the production of ethanol.

V. ANSWER QUESTIONS 45 AND 46, AND ANY ONE OF QUESTIONS 47 OR 48 (3 + 3 + 4 = 10.0)

45. Write the process flowchart for the production of biodiesel from Jatropha seeds.

46. Draw a neat sketch of a horizontal-axis commercial windmill and explain its working.

47. Explain the solar drying system.

OR

48. Draw a neat sketch and explain the construction and working of a floating-drum-type biogas plant.

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