JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II MINERAL PROCESSING Previous Question Paper (December - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
How is liberation achieved by size reduction?
Answer
Liberation is achieved by mechanical size reduction, which involves breaking the ore into smaller particles to physically detach valuable mineral grains from the associated gangue minerals. By reducing the particle size to below the grain size of the minerals, the individual components are exposed as separate entities.
What are the advantages of toothed roll crushers?
Answer
Toothed roll crushers offer several advantages: they provide a high reduction ratio, produce a more uniform product size with minimal fines, and are highly effective for crushing friable or sticky materials that might otherwise clog conventional crushers.
What is Newton’s law for terminal velocity?
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What is the significance of equal settling ratio?
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What are normal coals?
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List out the applications of electrostatic separation process.
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What happens in pulsion stroke in a jig?
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What happens in suction stroke in a jig?
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How do collectors work?
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What is the effect of particle size on flotation efficiency?
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Part B
Describe the working of a gyratory crusher. What are its advantages and limitations?
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List out the advantages of closed circuit grinding.
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State and explain comminution laws.
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List out the advantages of wet grinding.
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Explain how Stoke’s law is used in classification.
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What factors affect terminal velocity of falling particles?
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Differentiate between Stoke’s law and Newton’s law.
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Differentiate between Free Settling and Hindered settling ratios.
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List out the requirements of media in heavy media separation.
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Describe the working of a electrostatic separator. Compare magnetic separation and electrostatic separation.
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Draw a flow chart for heavy media separation.
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Describe Lessing process. What is its limitation?
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Compare jigging and tabling.
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Describe the working of a Hancock jig.
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Explain how stratification of particles takes place in tabling.
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What are the various jigging cycles? Describe them.
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Explain the principle of flotation. What are the applications of flotation?
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Compare collectors and frothers.
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Compare activators and deactivators.
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What are collectors? What factors affect collector’s efficiency?
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Compare Pneumatic and mechanical flotation cells.
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