CR-211-2012-end - €32 National Institute of Technology...

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Unformatted text preview: €32? National Institute of Technology, Rourkela — 769008 End- Semester Examination, 2012-13; B. Tech: 3rd Semester Subject: Unit Operations in Ceramic Processing; Sub ID: CR-211; Full Marks: 75 Duration of Examination: 3 hrs Answer ALL Questions All parts of a question should be answered at one place Why ‘wet,grinding’ is favored over ‘dry grinding’? Mention the difference in the shaping by ‘Jollying’ and ‘Jiggering’. Why washing is needed in cake filtration? Instead of fabricating solid extrudate you want to get hollow cylinder. How would you get that? Correlate the ‘volume shrinkage’ with ‘linear shrinkage ‘for an isotropic drying. 5><3=15 Why ‘sieving’ is important in ceramic processing? How do characterize the granular solids? With a neat schematic explain the construction and operation of a primary crusher. 2.5 + 2.5 + 5 = 10 Describe the main mechanisms employed in mixing. Depending on the increasing consistency can you suggest choosing of different type of mixer in processing? 6+4= 10 Discuss the cake filtration and cross-filtration in brief. Why the rate of filtration decreases with the time in case of cake filtration? 5+5 =10 With suitable schematic describe the operation of a non—mechanical classifier. How settling velocity helps in gravitational classification? 5+5 =10 State the advantages and disadvantages of piston extruder and auger extruder. Describe the ‘bird foot crack’ and ‘moon shaped’ crack’ as extrusion defect with remedies. 5+5 =10 List up the drying defects and try to explain those by differential shrinkage. With suitable schematics correlate the fact of ‘constant rate period’ and ‘falling rate period’ in drying. 5+5 =10 ...
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