Test your basic knowledge |

Engineering Materials

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. 1. Fluorescent Lamp - tungstate or silicate coating on inside of tube emits white light due to UV light generated inside the tube. 2. TV screen - emits light as electron beam is scanned back and forth.






2. Elastic means reversible! This is not a permanent deformation.






3. 1. Necking 2. Cavity formation 3. Cavity coalescence to form cracks 4. Crack propagation (growth) 5. Fracture






4. 1. Electron motions 2. The spins on electrons - Net atomic magnetic moment: sum of moments from all electrons.






5. There is always some statistical distribution of flaws or defects.






6. Width of smallest feature obtainable on Si surface






7. Without passing a current a continually varying magnetic field will cause a current to flow






8. heat flux = -(thermal conductivity)(temperature gradient) - Defines heat transfer by CONDUCTION

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


9. This strength parameter is similar in magnitude to a tensile strength. Fracture occurs along the outermost sample edge - which is under a tensile load.






10. Occur when lots of dislocations move.






11. For a metal - there is no ______ - only reflection






12. Reflectiviy is between 0.90 and 0.95 - Metal surfaces appear shiny - Most of absorbed light is reflected at the same wavelength (NO REFRACTION) - Small fraction of light may be absorbed - Color of reflected light depends on wavelength distribution of






13. Undergo little or no plastic deformation.






14. 1. Yield = ratio of functional chips to total # of chips - Most yield loss during wafer processing - b/c of complex 2. Reliability - No device has infinite lifetime. Statistical methods to predict expected lifetime - Failure mechanisms: Diffusion reg






15. Process by which geometric patterns are transferred from a mask (reticle) to a surface of a chip to form the device.






16. Degree of opacity depends on size and number of particles - Opacity of metals is the result of conduction electrons absorbing photons in the visible range.






17. Allows you to calculate what happened G=F' x cos(lambda) - F=F' x cos(phi)






18. Hardness is the resistance of a material to deformation by indentation - Useful in quality control - Hardness can provide a qualitative assessment of strength - Hardness cannot be used to quantitatively infer strength or ductility.






19. Measures impact energy 1. Strike a notched sample with an anvil 2. Measure how far the anvil travels following impact 3. Distance traveled is related to energy required to break the sample 4. Very high rate of loading. Makes materials more "brittle."






20. 1. Metals: Thermal energy puts many electrons into a higher energy state. 2. Energy States: Nearby energy states are accessible by thermal fluctuations.






21. -> fluorescent light - electron transitions occur randomly - light waves are out of phase with each other.






22. 1. Data for Pure Silicon - electrical conductivity increases with T - opposite to metals






23. Found in 26 metals and hundreds of alloys & compounds - Tc= critical temperature = termperature below which material is superconductive.






24. Typical loading conditions are _____ enough to break all inter-atomic bonds






25. 1. Tensile (opening) 2. Sliding 3. Tearing






26. The ability of a material to absorb heat - Quantitatively: The energy required to produce a unit rise in temperature for one mole of a material.






27. A measure of the ease with which a B field can be induced inside a material.






28. With Increasing temperature - the saturation magnetization diminishes gradually and then abruptly drops to zero at Curie Temperature - Tc.






29. Failure under cyclic stress 1. It can cause part failure - even though (sigma)max < (sigma)c 2. Causes ~90% of mechanical engineering failures.






30. The size of the material changes with a change in temperature - polymers have the largest values






31. Because of ionic & covalent-type bonding.






32. Cp: Heat capacity at constant pressure Cv: Heat capacity at constant volume.






33. Sigma=ln(li/lo)






34. Small Coercivities - Used for electric motors - Example: commercial iron 99.95 Fe






35. Different orientation of cleavage planes in grains.






36. Increase temperature - increase in interatomic separation - thermal expansion






37. Emitted light is in phase






38. Undergo extensive plastic deformation prior to failure.






39. Measures Hardness - No major sample damage - Each scales runs to 130 but only useful in range 20-100 - Minor load is 10 kg - Major load: 60 kg (diamond) - 100 kg (1/16 in. ball) - 150 kg (diamond)






40. No appreciable plastic deformation. The crack propagates very fast; nearly perpendicular to applied stress. Cracks often propagate along specific crystal planes or boundaries.






41. If a material has ________ - then the field generated by those moments must be added to the induced field.






42. Not ALL the light is refracted - SOME is reflected. Materials with a high index of refraction also have high reflectance - High R is bad for lens applications - since this leads to undesirable light losses or interference.






43. Resistance to plastic deformation of cracking in compression - and better wear properties.






44. Rho=F/A - tau=G/A . Depending on what angle the force is applied - and what angle the crystal is at - it takes different amounts of force to induce plastic deformation.






45. Metals are good conductors since their _______is only partially filled.






46. - A magnetic field is induced in the material B= Magnetic Induction (tesla) inside the material mu= permeability of a solid






47. Digitalized data in the form of electrical signals are transferred to and recorded digitally on a magnetic medium (tape or disk) - This transference is accomplished by a recording system that consists of a read/write head - "write" or record data by






48. Is analogous to toughness.






49. Second phase particles with n > glass.






50. Another optical property - Depends on the wavelength of the visible spectrum.