OML751 Testing of Materials (TOM) All 5 units Important and Assignment Questions (Incl. Year Questions)

1. © Dr.S.Thirumalvalavan, ASP/Mech, 5104-AEC.
DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT-I : Introduction to Materials Testing
ASSIGNMENT-I : QUESTIONS
_____________________________________________________________________
YEAR: IV SEMESTER: VII
Answer ALL questions
PART - A
1. What are the advantages of materials testing? (Nov/Dec’2020)
2. What is the importance of testing standards? (Nov/Dec’2020 & Nov/Dec’2021)
3. What is the difference between Destructive Testing and Non Destructive testing?
(Nov/Dec’2021)
4. Write the different classification of the material testing methods. (Apr/May’2023)
5. Write the importance of result analysis after material testing. (Apr/May’2023)
6. List the stages of development of testing.
PART – B & C
1. Explain briefly about the classification of materials testing and testing standards.
(Nov/Dec’2021) Describe the various classifications of materials testing.
(Nov/Dec’2020)
2. Discuss the different testing organizations, its committee and the standards
followed. (Nov/Dec’2020). Discuss briefly the testing organisation and its
committees. (Nov/Dec’2021)
3. Describe the different classification of materials and their relative properties in
detail. (Apr/May’2023)
4. With example explain the procedure for selecting a suitable material for a specific
application. (Apr/May’2023)
5. Explain various stages in development of testing in detail. What is the purpose of
developing a test? Explain with few examples.

2. © Dr.S.Thirumalvalavan, ASP/Mech, 5104-AEC.
DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT – II : Mechanical Testing
ASSIGNMENT-II QUESTIONS
_____________________________________________________________________
YEAR: IV SEMESTER: VII
Answer ALL Questions
PART - A
1. What is the significant difference between Rockwell hardness testing and Vicker's
hardness testing? (Nov/Dec’2021)
2. Which hardness testing method can be used for measuring the hardness of aluminium
alloys and high strength steels? (Apr/May’2023)
3. What is the principle of hardness testing? (Nov/Dec’2020)
4. Why the tensile samples are dog-bone shaped? (Nov/Dec’2021)
5. Define Endurance limit. (Nov/Dec’2020)
6. Define strain hardening and proof stress.
7. State the difference between Endurance limit & Fatigue strength. (Apr/May’2023)
8. What kind of indenter suitable for Vickers hardness?
9. What is modulus of rupture in bending nature?
10. What is role of SN curve in fatigue mechanism?
PART – B & C
1. Explain the procedure for tensile testing. Using a typical stress-strain curve, discuss
the various properties that can be determined from the test. (Nov/Dec’2020 &
Apr/May’2023)
2. Explain the procedure for creep testing of materials. Explain with a neat sketch the
different stages in creep curve and the mechanism in each stage. (Nov/Dec’2020 &
Nov/Dec’2021 & Apr/May’2023)
3. What are major contrasts of nature between Rockwell, Brinell and Vickers hardness
tester. (Nov/Dec’2020)
4. Explain the procedure and standard specimen dimensions used for impact testing of
materials, and what are major contrasts of nature between Izod and Charpy test.
(Nov/Dec’2020)
5. Briefly explain Fatigue test. Draw S-N diagram (schematic) for mild steel and for
aluminium, explain how S-N diagram is plotted. (Nov/Dec’2021)
6. How Ductile to Brittle Transition Temperature (DBTT) is determined from toughness
versus temperature plot and explain the factors affecting DBTT. (Nov/Dec’2021)

3. © Dr.S.Thirumalvalavan, ASP/Mech, 5104-AEC.
DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT – III : NON DESTRUCTIVE TESTING
ASSIGNMENT-III : QUESTIONS
_____________________________________________________________________
YEAR: IV SEMESTER: VII
Answer ALL Questions
PART - A
1. List the applications and advantages of visual inspection. (Apr/May’2023)
2. State the principle of liquid penetrant testing. (Nov/Dec’2021)
3. What are the limitations of magnetic particle testing? (Nov/Dec’2020)
4. State any two applications of eddy current testing. (Nov/Dec’2020)
5. What is the purpose of lead screen in radiographic testing? (Nov/Dec’2021)
6. Write the applications of acoustic emission testing. (Apr/May’2023)
7. Write importance of NDT.
8. What are the factors affecting the choice of NDT method
9. Define Radiographic Testing.
10. Define Inherent discontinuities.
PART – B & C
1. Explain the various steps involved in liquid penetrant testing with their
advantages and limitations. (Nov/Dec’2020) & (Apr/May’2023)
2. Explain the procedure for determining the internal defects present in the material
using radiographic testing. (Nov/Dec’2020)
3. Discuss on the effect of various parameters on the Depth of penetration in Eddy
current testing. (Nov/Dec’2021)
4. Explain Magnetic particle testing and why metals with low coercive force is difficult
to test in Magnetic particle inspection technique. (Nov/Dec’2021)
5. Explain the principle, advantages and limitations of Acoustic emission techniques.
(Nov/Dec’2021)
6. Explain the working of a pulse echo A-scan ulrasonic test machine to find the defects
in a component. (Apr/May’2023)
7. Suggest and explain the suitable technique to detect the longitudinal and transverse
cracks in a welded component. (Apr/May’2023)
8. When a magnetic field strength of 0.2 Tesla is applied on an electromagnetic lens
perpendicular to the electron beam direction with an applied voltage of 20 kV, what
would be the radius of electron beam (Mass of electron is 9.109x10-31
kg and charge is
1.602x10-19
coulombs. (Nov/Dec’2021)

4. © Dr.S.Thirumalvalavan, ASP/Mech, 5104-AEC.
DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT – IV : MATERIAL CHARACTERIZATION TESTING
ASSIGNMENT-IV : QUESTIONS
_____________________________________________________________________
YEAR: IV SEMESTER: VII
Answer ALL Questions
PART - A
1. What is the principle of optical microscopy? (Nov/Dec’2020)
2. What is the information(s) that can be determined using X-Ray Diffraction?
(Nov/Dec’2020)
3. Why electron microscope gives better resolution than optical microscope?
(Nov/Dec’2021)
4. What is the difference between Energy dispersive and wave dispersive spectroscopy?
(Nov/Dec’2021)
5. What is the principle of X-ray diffraction. (Apr/May’2023)
6. Differentiate between macroscopic and microscopic observations. (Apr/May’2023)
7. Define magnification.
8. Write principle of SEM and TEM.
9. State Diffraction Principle.
10. What is the information(s) that can be determined using X-ray diffraction?
PART – B & C
1. Explain the principle and working of any one electron microscopy technique.
(Nov/Dec’2020)
2. Briefly explain the different types of electrical and magnetic techniques with their
advantages. (Nov/Dec’2020)
3. Explain the interaction of electron beam with matter and explain how they are used to
analyse the structural and compositional features. (Nov/Dec’2021)
4. Explain any two magnetic techniques used for characterisation of materials.
(Nov/Dec’2021)
5. Elucidate the principle and working of Scanning Electron Microscopy with the different
operational modes. (Apr/May’2023)
6. Briefly discuss the types, advantages and limitations of the electron and magnetic
characterization techniques.
7. Explain the principle and working of Transmission Electron Microscopy technique.
8. List out the Common types of Electrical techniques. Explain briefly with neat sketch –
Electrical Impedance Spectroscopy (EIS).

5. © Dr.S.Thirumalvalavan, ASP/Mech, 5104-AEC.
DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT – V : OTHER TESTING
ASSIGNMENT-V : QUESTIONS
_____________________________________________________________________
YEAR: IV SEMESTER: VII
Answer ALL Questions
PART - A
1. What is the principle of Differential Scanning Calorimetry? (Nov/Dec’2020)
2. Name of the technique that is commonly used for determining the % carbon in cast irons.
(Nov/Dec’2020)
3. What does Differential scanning calorimeter do and how does it work?(Nov/Dec’2021)
4. What are the basic components of Mass Spectrometer? (Nov/Dec’2021)
5. Mention any four applications of differential scanning calorimetry. (Apr/May’2023)
6. Draw a typical DCS curve showing the melting peak. (Apr/May’2023)
7. What is meant by Dilatometer?
8. Define inductively coupled plasma.
9. How X ray is utilized in XRF spectroscopy?
10. Define chemical testing. List the types of chemical composition techniques & tests.
PART – B & C
1. Explain the principle, procedure and advantages of dynamic mechanical analysis.
(Nov/Dec’2020)
2. Explain the principle and procedure for determining elemental composition using
inductively coupled plasma. (Nov/Dec’2020)
3. Explain the procedure for any one commercial method used in steel foundries to
determine the chemical composition of materials. (Nov/Dec’2020)
4. Explain the principle and applications of thermo-mechanical and dynamic mechanical
analysis. (Nov/Dec’2021)
5. Explain how Optical Emission Spectroscopy works and mention its limitations.
(Nov/Dec’2021)
6. Discuss the principle and working of Differential Thermal Analysis (DTA) and its
applications. (Apr/May’2023)
7. Explain the procedure for determining the composition analysis using Inductively
Coupled Plasma technique. (Apr/May’2023)