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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. 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






2. Process by which metal atoms diffuse because of a potential.






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






4. Plastic means permanent! When a small load is applied - bonds stretch & planes shear. Then when the load is no longer applied - the planes are still sheared.






5. Increase temperature - no increase in interatomic separation - no thermal expansion






6. 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.






7. - The emission of light from a substance due to the absorption of energy. (Could be radiation - mechanical - or chemical energy. Could also be energetic particles.) - Traps and activator levels are produced by impurity additions to the material - Whe






8. Dramatic change in impact energy is associated with a change in fracture mode from brittle to ductile.






9. High toughness; material resists crack propagation.






10. Liquid polymer at room T - sandwiched between two sheets of glass - coated with transparent - electrically conductive film. - Character forming letters/ numbers etched on the face - Voltage applied disrupts the orientation of the rod- shaped molecule






11. Occur due to: restrained thermal expansion/contraction -temperature gradients that lead to differential dimensional changes sigma = Thermal Stress






12. Becomes harder (more strain) to stretch (elongate)






13. The ability of a material to transport heat - Atomic Perspective: Atomic vibrations and free electrons in hotter regions transport energy to cooler regions - Metals have the largest values






14. These materials are "attracted" to magnetic fields.






15. Sigma=ln(li/lo)






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






17. ...occurs in bcc metals but not in fcc metals.






18. A three terminal device that acts like a simple "on-off" switch. (the basis of Integrated Circuits (IC) technology - used in computers - cell phones - automotive control - etc) - If voltage (potential) applied to the "gate" - current flows between th






19. 1. Diamagnetic (Xm ~ 10^-5) - small and negative magnetic susceptibilities 2. Paramagnetic (Xm ~ 10^-4) - small and positive magnetic susceptibilities 3. Ferromagnetic - large magnetic susceptibilities 4. Ferrimagnetic (Xm as large as 10^6) - large m






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






21. Different orientation of cleavage planes in grains.






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






23. The ability of a material to be rapidly cooled and not fracture






24. Created by current through a coil N= total number of turns L= length of turns (m) I= current (ampere) H= applied magnetic field (ampere-turns/m) Bo= magnetic flux density in a vacuum (tesla)






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






26. Diffuse image






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






28. # of thermally generated electrons = # of holes (broken bonds)






29. Because of ionic & covalent-type bonding.






30. Is reflected - absorbed - scattered - and/or transmitted: Io=It+Ia+Ir+Is






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






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






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






34. Occur when lots of dislocations move.






35. 1. Hard disk drives (granular/perpendicular media) 2. Recording tape (particulate media)






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






37. Undergo little or no plastic deformation.






38. They are used to assess properties of ceramics & glasses.






39. 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."






40. The magnetic hysteresis phenomenon: Stage 1: Initial (unmagnetized state) Stage 2: Apply H - align domains Stage 3: Remove H - alignment remains => Permanent magnet Stage 4: Coercivity - Hc negative H needed to demagnitize Stage 5: Apply -H - align d






41. Wet: isotropic - under cut Dry: ansiotropic - directional






42. As the applied field (H) increases the magnetic domains change shape and size by movement of domain boundaries.






43. 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.






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






45. Heat capacity.....- increases with temperature -for solids it reaches a limiting value of 3R






46. These are liquid crystal polymers- not your normal "crystal" -Rigid - rod shaped molecules are aligned even in liquid form.

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






48. Specific heat = energy input/(mass*temperature change)






49. Ability to transmit a clear image - The image is clear.






50. Ohms Law: voltage drop = current * resistance