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Antimicrobial resistance (AMR), or drug resistance, develops when bacteria, viruses, or fungi stop responding to existing antimicrobial treatments. a) Izod test Figure 1. d) Orthotropic Y    Q    Of course increasing surface roughness lead to increase the Coefficient of friction and also the value of surface roughness depended on field of applications for surface of part . Once the curing takes place, the coating cannot be returned to its original form by any means. This process is known as “fusion bonding”. b) Rockwell C hardness test a) Creep Aerographene, also known as graphene aerogel, is believed to be the world’s lightest material with a density of just 0.16 milligram per cubic centimeter. m. Resistance to ultraviolet light: Significant if application is outdoors and high intensity indoors. View Answer, 7. It is noncombustible and has low thermal conductivity, meaning that it takes a long time for fire to affect its structural, load-bearing ability, and it protects from the spread of fire. T    Generation is the greatest at the surface of the material, where the majority of the light is absorbed. Scratch hardness tests are usually performed on brittle materials, such as ceramics and minerals because they do not undergo plastic deformation. Indentation hardness tests are one of the most common hardness tests performed across several industries as materials are often subjected to continuous loading in real-world applications. These scratches are typically narrow deformations caused by the removal of material due to contact with a sharp, harder material. Also, it is typically important to determine the composition of corrosion products, or any surface films. a) Creep Most ir… H    Posted in: Pro Tips, stainless steel, Bronze, Galvanized Steel, corrosion resistant metal, rust resistant, copper, brass metal, aluminum Time to Read: 2m 30s We usually think of rust as the orange-brown flakes that form on an exposed steel surface when iron molecules in the metal react with oxygen in the presence of water to produce iron oxides. Hardness covers several properties: resistance to deformation, resistance to friction and abrasion.. Pure iron is a soft, grayish-white metal. Smoke developed by plywood panels was quite low. To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Malleability Cite 6th Nov, 2018 In the mid 1980's, researchers developed an enzymatic process to successfully remove lignin from the hemp fiber without compromising its strength. View Answer, 8. This type of hardness is typically measured on a scale known as the Rockwell Scale. uPVC is resistant to the effects of UV light which would quickly cause normal PVC to become brittle. 1. During rebound hardness tests, the material absorbs the impact energy from a diamond-tipped hammer and returns it, causing the hammer to bounce after it strikes the surface. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. This relationship is also called Ohm’s law. In the UL tests, average smoke-developed values ranged from 25 to 130. a) Stiffness Aluminum alloys contain almost no iron and without iron, the metal can’t actually rust, but it does oxidize. That's about two-thirds the temperature at the surface of the sun and 200 K higher than … Hot-dip vs Cold Galvanizing: What’s the Difference? The total number of scales used in Rockwell hardness test is? Which of the following hardness test uses steel ball as indenter? I    Indentation hardness is a material’s resistance to permanent deformation due to a localized continuous load. Surface Hardness – PMMA is a tough, durable and lightweight thermoplastic. Iron is one of the most common elements on earth. This property is essential as it directly correlates to the material’s performance and suitability. The only pure iron known to exist naturally comes from fallen meteorites. Ma… Recently, materials like aerogel (used by NASA for the construction of heat resistant tiles, capable of withstanding heat up to approximately 2000 degrees Fahrenheit with little or no heat transfer), have become affordable and available. Terms of Use - For instance, a material that performs well under a short-duration, high-impact load may not perform as well when subjected to a continuous long-duration load. It is a very simple but inexact comparative test. This apparatus developed at the Road Research Laboratory is used to measure the frictional resistance between a rubber slider (mounted on the end of a pendulum arm) and the road surface. Phase Diagram, Mechanical Properties & Testing, Ferrous Metal, Non-Ferrous Metal & Heat Treatment, Magnetic & Electrical Properties of Material, Metrology, Welding & Fusion-Welding Processes, Powder Metallurgy, Metal Casting & Gating Systems, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Manufacturing Engineering Questions & Answers – Imperfection and Defects In Solid, Next - Manufacturing Engineering Questions & Answers – Mechanical Testing, Manufacturing Engineering Questions & Answers – Imperfection and Defects In Solid, Digital Circuits Questions and Answers – 1’s, 2’s, 9’s & 10’s Complements – 2, Mechanical Operations Questions and Answers, Corrosion Engineering Questions and Answers, Aeronautical Engineering Questions and Answers, Chemical Engineering Questions and Answers, Basic Civil Engineering Questions and Answers, Engineering Chemistry II Questions and Answers, Best Reference Books – Technology, Engineering and Sciences, Concrete Technology Questions and Answers, Mechatronics Engineering Questions and Answers, Structural Analysis Questions and Answers, Railway Engineering Questions and Answers, Metallurgical Engineering Questions and Answers, Engineering Materials and Metallurgy Questions and Answers, Aerospace Materials and Processes Questions and Answers, Mechanical Engineering Questions and Answers, Mechanical Metallurgy Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers, Tissue Engineering Questions and Answers – Properties of Biomaterials. 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