Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2172108 Metal Working Processes Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172108 Date: 26/11/2018
Subject Name: Metal Working Processes
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) Classify metal forming processes. 03
(b) Differentiate between cold and hot working. 04
(c) What is Stress-Strain diagram? Draw sample Stress-Strain
diagrams for mild steel and cementite.
07
Q.2 (a) Multiple Choice Questions:
1) A three high rolling mill consists of three rolls placed one
above the other. Which of the following statement is
correct?
a. The upper and middle rolls rotate in the same
direction whereas the bottom roll rotates in
opposite direction.
b. The upper and bottom rolls rotate in the same
direction whereas the middle roll rotates in
opposite direction.
c. The middle and bottom rolls rotate in the same
direction whereas the upper roll rotates in opposite
direction.
d. All the upper, middle and bottom rolls rotate in the
same direction.
2) A moving mandrel is used in
a. Wire drawing
b. Tube drawing
c. Metal cutting
d. Forging
3) Cold working of metal increases
a. Tensile strength
b. Yield strength
c. Hardness
d. All of the above
03
(b) Briefly explain flow curve for material. 04
(c) Draw Tresca?s yield criteria in two-dimensional stress state and
write yield condition for each side of the diagram.
07
OR
(c) Find the relationship between von Mises? yield function and the
shear stress on octahedral plane for a state of stress given by three
principal stresses.
07
Q.3 (a) Name at least six components that are manufactured by extrusion
processes.
03
(b) What are the benefits of hydrostatic extrusion process? 04
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172108 Date: 26/11/2018
Subject Name: Metal Working Processes
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) Classify metal forming processes. 03
(b) Differentiate between cold and hot working. 04
(c) What is Stress-Strain diagram? Draw sample Stress-Strain
diagrams for mild steel and cementite.
07
Q.2 (a) Multiple Choice Questions:
1) A three high rolling mill consists of three rolls placed one
above the other. Which of the following statement is
correct?
a. The upper and middle rolls rotate in the same
direction whereas the bottom roll rotates in
opposite direction.
b. The upper and bottom rolls rotate in the same
direction whereas the middle roll rotates in
opposite direction.
c. The middle and bottom rolls rotate in the same
direction whereas the upper roll rotates in opposite
direction.
d. All the upper, middle and bottom rolls rotate in the
same direction.
2) A moving mandrel is used in
a. Wire drawing
b. Tube drawing
c. Metal cutting
d. Forging
3) Cold working of metal increases
a. Tensile strength
b. Yield strength
c. Hardness
d. All of the above
03
(b) Briefly explain flow curve for material. 04
(c) Draw Tresca?s yield criteria in two-dimensional stress state and
write yield condition for each side of the diagram.
07
OR
(c) Find the relationship between von Mises? yield function and the
shear stress on octahedral plane for a state of stress given by three
principal stresses.
07
Q.3 (a) Name at least six components that are manufactured by extrusion
processes.
03
(b) What are the benefits of hydrostatic extrusion process? 04
2
(c) What is extrusion? Explain different extrusion process and explain
role of lubricant.
07
OR
Q.3 (a) Why small diameter rolls should be used for rolling very thin
sheets?
03
(b) What is the effect of the following factors on the rolling load?
1) The co-efficient of friction,
2) Forward and backward tension.
04
(c) Discuss rolling defects with causes and remedies. 07
Q.4 (a) What is the function of flash in forging. 03
(b) Give the effect of forging on microstructure in comparison with
machining and casting.
04
(c) Compare and contrast open die forging and close die forging. 07
OR
Q.4 (a) Explain briefly deep drawing process with figure. 03
(b) With neat sketch discuss stretch forming. 04
(c) Write short note on workability. 07
Q.5 (a) Discuss the effect of strain rate on metal working processes. 03
(b) What are the common defects observed in wire drawing process?
Explain any one in detail.
04
(c) With neat sketch explain the types of tube-drawing processes. 07
OR
Q.5 (a) What are the required properties for die selection? 03
(b) Define:
1) Bloom,
2) Billet,
3) Slab,
4) Strip.
04
(c) Explain recovery, recrystallization and grain growth with structure
property relationship graph.
07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020