Download GTU BE/B.Tech 2019 Winter 4th Sem New 2142102 Principles Of Extractive Metallurgy Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem New 2142102 Principles Of Extractive Metallurgy Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

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:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define Extractive metallurgy, calcinations and roasting. 03
(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
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
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
(b)
During electrolysis of CuSO 4 25 gms of copper is deposited at cathode.
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.
04
(c)
Write a note on fused salt electrolysis.
07
OR
Q.4 (a)
Draw flow sheet of extraction of Zinc.
03
(b) List out physical method of Refining. Explain selective distillation
of impurities.
04
(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

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 reefing. 07

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