Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
--- Content provided by FirstRanker.com ---
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019
Subject Code: 2142102 Date: 13/12/2019
Subject Name: Principles of Extractive Metallurgy
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
--- Content provided by FirstRanker.com ---
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
Q.1 (a) Define Extractive metallurgy, calcinations and roasting. 03
--- Content provided by FirstRanker.com ---
(b) Explain briefly sources of metals. 04
(c) Justify the importance of Ellingham diagram for oxide system in extractive metallurgy 07
Q.2 (a) Draw a simple flow sheet for extraction of Aluminum from bauxite ore. 03
(b) Write in detail about ion exchange process. 04
(c) Compare pyrometallurgy and hydrometallurgy in terms of merits and demerits. 07
--- Content provided by FirstRanker.com ---
OR
(c) List out Pyro metallurgical processes. Differentiate between pelletizing and sintering. 07
Q.3 (a) What is percolation leaching? List out advantage of it. 03
(b) Define smelting. Explain matte smelting process 04
(c) Discuss briefly fluidized bed roasting process. 07
--- Content provided by FirstRanker.com ---
OR
Q.3 (a) Explain the reason of using autoclave in pressure leaching. 03
(b) Discuss Reduction smelting with suitable example. 04
(c) Describe the microbial leaching. Explain the effect of bacteria on leaching rate and extent of recovery 07
Q.4 (a) Explain the Zone refining. 03
--- Content provided by FirstRanker.com ---
(b) During electrolysis of CuSO4 25 gms of copper is deposited at cathode. 04 Calculate 1) Coulombs required to deposit given amount of copper 2) Time required to deposit given amount of copper when 3 amp of steady current is maintained.
(c) Write a note on fused salt electrolysis. 07
OR
Q.4 (a) Draw flowsheet of extraction of Zinc. 03
(b) List out physical method of Refining. Explain selective distillation of impurities. 04
--- Content provided by FirstRanker.com ---
(c) Illustrate the kinetics of leaching with concentration profile of mineral surface. 07
Q.5 (a) Differentiate between Order of reactions and Molecularity 03
(b) Describe theory of Absolute Reaction Rate. 04
(c) Explain Collision Theory of reaction kinetics. 07
OR
--- Content provided by FirstRanker.com ---
Q.5 (a) Derive Arrhenius Equation 03
(b) Draw process flow sheet of Cu extraction with important parameters involved in the process. 04
(c) Differentiate between electro winning and electro refining. 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University