B.E. Mechanical Engineering. OML751 – TESTING OF MATERIALS. UNIT-II : Mechanical Testing. UNIT-II: ASSIGNMENT & IMP QUESTIONS.

1. DEPARTMENT OF MECHANICAL ENGINEERING
OML 751 – TESTING OF MATERIALS
UNIT – II : Mechanical Testing
ASSIGNMENT-II QUESTIONS
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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)