Download GTU BE/B.Tech 2019 Winter 3rd Sem New 2132104 Testing Of Metals And Alloys Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 2132104 Testing Of Metals And Alloys Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2132104 Date: 3/12/2019

Subject Name: Testing of Metals and Alloys
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) Explain the objective of testing of materials. 03
(b) Derive the relation between true strain and engineering strain. 04
(c) Explain engineering stress-strain curve of a ductile material and
define the following:
1) Modulus of elasticity,
2) Yield strength,
3) Ultimate tensile strength,
4) Toughness and
5) Resilience.
07

Q.2 (a) What information do you get from Charpy test? 03
(b) In the tension test of a metal, fracture occurs at maximum load.
The conditions at fracture were: Af = 100 mm
2
and Lf = 60 mm.
The initial values were: Ao = 150 mm
2
and Lo = 40 mm.
Determine the true strain to fracture using change in both length
and area. Comment on the results obtained.
04
(c) What is calibration of instruments? Discuss the importance of
calibration of testing instruments
07
OR
(c) Classify methods for testing of material. Describe the criteria for
selection of a particular testing method.
07
Q.3 (a) Write a note on microhardness test. 03
(b) List Rockwell Hardness Test advantages & limitations. 04
(c) Explain why Vickers hardness is independent of load while Brinell
hardness is not.
07
OR
Q.3 (a) Define and explain Creep-Rupture strength. 03
(b) Schematically draw creep curves for,
1) Constant load test and
2) Constant stress state.
04
(c) ?Testing of material is an important task for industry? ? justify
comment.
07
Q.4 (a) Write a note on yield point phenomena. 03
(b) Give mechanism of cup and cone type fracture. 04
(c) Derive the condition for necking during tensile testing (uniaxial). 07
OR
Q.4 (a) Discuss the effect of temperature on flow properties. 03
(b) Discuss different methods to improve fatigue life of a material. 04
(c) Draw S-N curve and identify the following:
1) LCF region,
2) HCF region and
3) Fatigue limit.
07
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2132104 Date: 3/12/2019

Subject Name: Testing of Metals and Alloys
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) Explain the objective of testing of materials. 03
(b) Derive the relation between true strain and engineering strain. 04
(c) Explain engineering stress-strain curve of a ductile material and
define the following:
1) Modulus of elasticity,
2) Yield strength,
3) Ultimate tensile strength,
4) Toughness and
5) Resilience.
07

Q.2 (a) What information do you get from Charpy test? 03
(b) In the tension test of a metal, fracture occurs at maximum load.
The conditions at fracture were: Af = 100 mm
2
and Lf = 60 mm.
The initial values were: Ao = 150 mm
2
and Lo = 40 mm.
Determine the true strain to fracture using change in both length
and area. Comment on the results obtained.
04
(c) What is calibration of instruments? Discuss the importance of
calibration of testing instruments
07
OR
(c) Classify methods for testing of material. Describe the criteria for
selection of a particular testing method.
07
Q.3 (a) Write a note on microhardness test. 03
(b) List Rockwell Hardness Test advantages & limitations. 04
(c) Explain why Vickers hardness is independent of load while Brinell
hardness is not.
07
OR
Q.3 (a) Define and explain Creep-Rupture strength. 03
(b) Schematically draw creep curves for,
1) Constant load test and
2) Constant stress state.
04
(c) ?Testing of material is an important task for industry? ? justify
comment.
07
Q.4 (a) Write a note on yield point phenomena. 03
(b) Give mechanism of cup and cone type fracture. 04
(c) Derive the condition for necking during tensile testing (uniaxial). 07
OR
Q.4 (a) Discuss the effect of temperature on flow properties. 03
(b) Discuss different methods to improve fatigue life of a material. 04
(c) Draw S-N curve and identify the following:
1) LCF region,
2) HCF region and
3) Fatigue limit.
07
2
Q.5 (a) Describe the Bauschinger effect. 03
(b) Write the formula for Brinell and Knoop hardness along with
symbol description.
04
(c) Explain Izod impact test. Mention factors affecting Test. 07
OR

Q.5 (a) Differentiate between ductile and brittle fracture. 03
(b) Explain mechanism of brittle fracture propagation. 04
(c) What is ductile to brittle transition behavior and its significance?
Draw suitable diagram.
07

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