GTU BE 8th Semester 2182115 Alloy Design (Department Elective -III) Summer 2018 Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VIII (NEW) – EXAMINATION ? SUMMER 2018
Subject Code: 2182115 Date: 02/05/2018
Subject Name: Alloy Design (Department Elective -III)
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) What is Alloy Design ? List the activities involved. 03
(b) Draw neat sketch of stress strain curve for ductile and
brittle materials giving suitable example &explain proof
stress.
04
(c) Define the terms: System, Phase, Components and degree
of freedom relationship giving suitable examples.
07

Q.2 (a) Explain Continuous and Discontinuous fiber alignment?
What is their effects on properties?
03
(b) Define the terms: Matrix, Dispersed phase, Particle, Fiber,
whiskers
04
(c) Explain in brief with examples of each: Particle
reinforced, Fiber reinforced and Structural composites.
07
OR
(c) What is Dual-phase Steel (DPS)? Discuss the various
advantages offered by DPS compared to Plain Carbon (PC) steel. List its applications.
07
Q.3 (a) State the difference between Alloy & Composites. 03
(b) Explain briefly effect of size, shape and distribution of
second phase on mechanical properties of alloys
04
(c) Explain with the neat schematic variations in mechanical
properties with respect to recovery, recrystallization and
grain growth.
07
OR
Q.3 (a) Explain factors to be considered for selection of materials
for the design of Static structure.
03
(b) Write Composition, Characteristics and applications of
HSLA
04
(c) What is Creep? With a neat diagram explain mechanism
of Creep deformation. What is Equi-cohesive temperature
in context with Creep Phenomena?
07
Q.4 (a) What is Fatigue? Show S-N diagram for various ferrous
&Non ferrous alloys
03

(b) Which are the principal alloying elements of group-M
HSS? List the effects of these elements on properties of
04 Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VIII (NEW) – EXAMINATION ? SUMMER 2018
Subject Code: 2182115 Date: 02/05/2018
Subject Name: Alloy Design (Department Elective -III)
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) What is Alloy Design ? List the activities involved. 03
(b) Draw neat sketch of stress strain curve for ductile and
brittle materials giving suitable example &explain proof
stress.
04
(c) Define the terms: System, Phase, Components and degree
of freedom relationship giving suitable examples.
07

Q.2 (a) Explain Continuous and Discontinuous fiber alignment?
What is their effects on properties?
03
(b) Define the terms: Matrix, Dispersed phase, Particle, Fiber,
whiskers
04
(c) Explain in brief with examples of each: Particle
reinforced, Fiber reinforced and Structural composites.
07
OR
(c) What is Dual-phase Steel (DPS)? Discuss the various
advantages offered by DPS compared to Plain Carbon (PC) steel. List its applications.
07
Q.3 (a) State the difference between Alloy & Composites. 03
(b) Explain briefly effect of size, shape and distribution of
second phase on mechanical properties of alloys
04
(c) Explain with the neat schematic variations in mechanical
properties with respect to recovery, recrystallization and
grain growth.
07
OR
Q.3 (a) Explain factors to be considered for selection of materials
for the design of Static structure.
03
(b) Write Composition, Characteristics and applications of
HSLA
04
(c) What is Creep? With a neat diagram explain mechanism
of Creep deformation. What is Equi-cohesive temperature
in context with Creep Phenomena?
07
Q.4 (a) What is Fatigue? Show S-N diagram for various ferrous
&Non ferrous alloys
03

(b) Which are the principal alloying elements of group-M
HSS? List the effects of these elements on properties of
04
group-M HSS.
(c) Summarize in a tabular form wear applications for
different class of materials
07
OR
Q.4 (a) Suggest the ways of reducing wear on materials. 03
(b) State fundamental criteria for selection of materials for
wear applications
04
(c) Write the role of various elements on Iron-base, Cobalt-
base and Nickel-base Super alloys.
07
Q.5 (a) What are Superalloys? List their applications 03
(b) Write Properties and Applications of Maraging Steels.
04
(c) With suitable example explain the phenomena of
Precipitation Strengthening.
07
OR
Q.5 (a) Suggest the materials for High dynamic loading
conditions.
03
(b) State the composition, Properties and application of
Hadfield Steel
04
(c) Explain how of computer-based methods are designing
alloys.
07