TAMIL NADU AGRICULTURAL UNIVERSITY B.Sc (Agri.)/ B.S (ABM) Degree Programmes Reappearance Final Theory Examination, Nov-Dec.2015 Year : III Semester : -

(2011 Syllabus)

Time : 2 ½ hrs Max. Marks: 60

FPE 311 Post Harvest and Food Engineering (1+1) PART- A (Answer All questions) [20 x 0.5 = 10] Choose the correct answer A1. If moisture content of paddy on dry basis is 25% the moisture content on wet basis will be ------------------. a) 20% b) 22% c) 24% d) 26% A2. In thin layer drying of food grains the thickness of layer is limited to---------------. a) 10 cm b) 20 cm c) 30 cm d) 40 cm A3. The degree of polishing in rice is limited to -----------------. a) 5 % b) 10 % c) 15 % d) 20 % A4. The oil content (%) of shelled groundnut is -----------------. a) 50-55 % b) 40-45 % c) 30-35 % d) 20-25% A5. Parboiling of paddy is a --------------- process. a) Heating process b) Soaking process c) Drying process d) Hydro thermal process Fill in the blanks A6. The gelatinization temperature of paddy is normally within --------------°C. A7. Polishing of rice in vertical cone polisher is based on ------------------force. A8. By using hullers the average yield of white rice obtained is ----------------. A9. Percentage of bran removed from paddy is ------------------. A10. Parboiling of paddy -----------------hardness of rice. Match the following A11. Belt conveyor - Roundness A12. Inclined belt separator - Indirect moisture measurement A13. Spiral separator - Rice husk A14. Universal moisture meter - Shape A15. Furfural - Horizontal conveying equipment State True or False A16. In CFTRI method of parboiling paddy is steeped for 3.5 hours. A17. Bulk density of grain is the ratio between mass and volume. A18. Porosity of food grains is in the range of 30-40%. A19. The point at which moisture content changes from constant rate to falling rate is known as equilibrium moisture content. A20. Metal pieces of iron or steel are separated from wheat grains on the basis of optic properties.

FPE 311 Post Harvest and Food Engineering (1+1) -2PART-B (Answer any Ten questions only) [10 x 1 = 10] B1. Define critical moisture content. B2. Define grading. B3. Define sorting. B4. Differentiate between thin layer drying and deep bed drying. B5. What are the factors that affect the efficiency of screw conveyor? B6. List out the types of threshing cylinders B7. List out the types of screen. B8. Differentiate between true density and bulk density. B9. What are the methods of direct moisture estimation? B10. What are the various types of plant layout? B11. What is MAP?

C1. C2. C3. C4.

C5. C6.

C7. C8. C9. C10. C11.

D1. D2. D3. D4.

PART-C (Answer any Ten questions only) [10 x 2 = 20] Distinguish between bag storage and bulk storage. Explain in brief the working of a colour sorter. List out the different stages of post harvest losses of food materials and explain the reasons. Two tonnes of paddy with 22% moisture content on wet basis are to be dried to 13% moisture content on dry basis. Calculate the weight of bone dry product and moisture evaporated. What are the advantages of mechanical drying over sun drying? Determine the quantity of parboiled wheat with 40% moisture content on wet basis required to produce 1 tonne of product with 12% moisture content on wet basis. Work out the problem on wet basis and check the answer using dry basis. What is the working principle of groundnut decorticator? How the oil is extracted by solvent extraction method? Briefly explain the working of winnower. Enumerate the factors responsible for the selection of location of plant. Write a short note on screw press. PART-D (Answer any Five questions only) [5 x 4 = 20] Explain the various engineering properties of food materials and its importance. Explain the working of a specific gravity separator with neat sketch. Explain the components and working of a bucket elevator with neat sketch Explain construction and working of husker sheller for maize with neat sketch.

FPE 311 Post Harvest and Food Engineering (1+1) -3D5.

D6.

A screw conveyor conveys about 500 kg of paddy with bulk density of 550 kg/m3 in 5 minutes. The pitch and the diameter of the screw remains the same of 25 cm and the diameter of the shaft is 5 cm. The screw rotates at a speed of 120 rpm. Compute actual capacity, theoretical capacity and conveyance efficiency. During the evaluation of specific gravity separator, 250 g of sample was collected for analysis of clean grain fraction from different outlets. The data is given as follows. The impurities /stone present in feed : 20.0 g The impurities /stone present in clean grain outlet : 5.0g The impurities present in stone outlet : 245.0g Calculate the cleaning efficiency of specific gravity separator. **************