Question#3 Write True (T) or False (F) in the following statements. g experiment

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Question#3 Write True (T) or False (F) in the following statements. g experiment an extensometer is used to measure the brittleness of specimen. Hooke's Law can be used for a given material is known as 1. The hardness of indenter should be greater than the hardness of specimen. ( extensomet 2. In a tensile testing 3. Th e largest value of stress for which proportional limit of that material. 4. (-) In Rockwell hardness test, "S" key is used to initiate the load cycle. 5, Materials having good surface finish possess higher fatigue strength. 6. The unit of Impact energy is Joule per cubic meter O/m2). 7, Diamond cone inden ters are used in Vickers hardness test. 8. Saw tooth jaws are used for round specimen. 9. According to Clerk Maxwell theorem for beams, the load and its deflection are not interchangeable in position. 10. Polar moment of inertia gives an object ability to resist bending about a given axis due to an applied torque. 11. Impact energy is also known as Notch Resilience. 12. Microscope is used in Rockwell and Brinell hardness test. 13. Tension and Impact tests are the type of Static testing. 14. Stiffness is the ability of a material to absorb energy and plastically deform without fracturing 15. Strain Hardening is the strengthening of metal or polymer by plastic deformation. 16. The temperature range of INSTRON UTM in which tension test has been performed, is in between ) 30 C TO 170C Page 3 of 5

Explanation / Answer

1) True. To have localised deformation it's usually made of hardened steel or diamond indenter.

2) False. It's used to measure strain. So indirectly the statement may be true.

3) False. Up to proportional limit Hook's law is valid.Ie stress proportional to strain.

4) True.

5) True

6) False

7) True

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