Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142102 Principles Of Extractive Metallurgy Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142102 Date:17/05/2019
Subject Name: Principles of Extractive Metallurgy
Time: 02:30 PM TO 05:00 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:
1) Calcination,
2) Pelletizing,
3) Current Density.
03
(b) What is extractive metallurgy? Give basic flow diagram of
extractive metallurgy.
04
(c) Define pyrometallurgy. Describe different advantages &
limitations of pyrometallurgical extraction process.
07
Q.2 (a) Multiple Choice Questions:
1) Kinks signify,
a. the point of change in entropy in Ellingham
diagram
b. the point of phase changes in Ellingham diagram
c. the point at which the gradient of line changes in
Ellingham diagram
d. all of the above
2) The process of calcinations and roasting are carried out in,
a. Blast furnace
b. Muffle furnace
c. Reverberatory furnace
d. Open hearth furnace
3) Which of the following is obtained by hydrometallurgy:
Cu, Au, Ag?
a. Cu only
b. Au and Cu only
c. Ag and Au only
d. All three
03
(b) Draw flow sheet for production of Iron and Steel. 04
(c) Explain importance of oxide free energy diagram in
pyrometallurgy. Write the limitations of Ellingham diagrams.
07
OR
(c) Describe the microbial leaching. Explain the effect of bacteria on
leaching rate and extent of recovery.
07
Q.3 (a) List the properties and function of flux in smelting process. 03
(b) Explain flash smelting process. 04
(c) What is roasting? Explain fluidized bed roasting process in brief. 07
OR
Q.3 (a) What is percolation leaching? List its advantages. 03
(b) Write in detail about ion exchange process. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142102 Date:17/05/2019
Subject Name: Principles of Extractive Metallurgy
Time: 02:30 PM TO 05:00 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:
1) Calcination,
2) Pelletizing,
3) Current Density.
03
(b) What is extractive metallurgy? Give basic flow diagram of
extractive metallurgy.
04
(c) Define pyrometallurgy. Describe different advantages &
limitations of pyrometallurgical extraction process.
07
Q.2 (a) Multiple Choice Questions:
1) Kinks signify,
a. the point of change in entropy in Ellingham
diagram
b. the point of phase changes in Ellingham diagram
c. the point at which the gradient of line changes in
Ellingham diagram
d. all of the above
2) The process of calcinations and roasting are carried out in,
a. Blast furnace
b. Muffle furnace
c. Reverberatory furnace
d. Open hearth furnace
3) Which of the following is obtained by hydrometallurgy:
Cu, Au, Ag?
a. Cu only
b. Au and Cu only
c. Ag and Au only
d. All three
03
(b) Draw flow sheet for production of Iron and Steel. 04
(c) Explain importance of oxide free energy diagram in
pyrometallurgy. Write the limitations of Ellingham diagrams.
07
OR
(c) Describe the microbial leaching. Explain the effect of bacteria on
leaching rate and extent of recovery.
07
Q.3 (a) List the properties and function of flux in smelting process. 03
(b) Explain flash smelting process. 04
(c) What is roasting? Explain fluidized bed roasting process in brief. 07
OR
Q.3 (a) What is percolation leaching? List its advantages. 03
(b) Write in detail about ion exchange process. 04
2
(c) Define leaching. Explain the pressure leaching process. Why is it
carried out in autoclave?
07
Q.4 (a) Describe the basic concept of electrometallurgy. 03
(b) Differentiate between electro-winning and electrorefining. 04
(c) Explain the process of fused salt electrolysis with suitable
example.
07
OR
Q.4 (a) Draw flow sheet for production of Lead. 03
(b) Draw flow sheet of extraction of Zinc. 04
(c) Draw process flow sheet of Copper extraction. Label all important
parameters involved in the process.
07
Q.5 (a) Explain zone refining. 03
(b) Discuss factors affecting velocity of a reaction. 04
(c) Discuss collision theory of reaction kinetics. 07
OR
Q.5 (a) Explain theory of absolute reaction rate. 03
(b) Derive Arrhenius equation. 04
(c) What is order of reactions and molecularity? Differentiate
between order and molecularity.
07
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This post was last modified on 20 February 2020