SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
Engineering Materials
Start Test
Study First
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. Cp: Heat capacity at constant pressure Cv: Heat capacity at constant volume.
Magnetic Storage Media Types
Two kinds of Reflection
Two ways to measure heat capacity
Griffith Crack Model
2. ...occurs in bcc metals but not in fcc metals.
Superconductivity
Intergranular Fracture
Where does DBTT occur?
Intrinsic Semiconductors
3. 1. Ability of the material to absorb energy prior to fracture 2. Short term dynamic stressing - Car collisions - Bullets - Athletic equipment 3. This is different than toughness; energy necessary to push a crack (flaw) through a material 4. Useful in
4 Types of Magnetism
High impact energy
Force Decomposition
Impact - Toughness
4. -> fluorescent light - electron transitions occur randomly - light waves are out of phase with each other.
Incoherent
Critical Properties of Superconductive Materials
Reflection of Light for Metals
Energy States: Insulators and Semiconductors
5. With Increasing temperature - the saturation magnetization diminishes gradually and then abruptly drops to zero at Curie Temperature - Tc.
Influence of Temperature on Magnetic Behavior
Thermal Expansion: Symmetric curve
Metallization
Slip Bands
6. Loss of image transmission - You get no image - There is no light transmission - and therefore reflects - scatters - or absorbs ALL of it. Both mirrors and carbon black are opaque.
High impact energy
Hysteresis and Permanent Magnetization
Refraction
Opaque
7. 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."
Luminescence
Iron-Silicon Alloy in Transformer Cores
IC Devices: P-N Rectifying Junction
Charpy or Izod test
8. A high index of refraction (n value) allows for multiple internal reactions.
Sparkle of Diamonds
Reflection of Light for Metals
Scattering
Dependence of Heat Capacity on Temperature
9. 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
Pure Semiconductors: Conductivity vs. T
Heat Capacity
Reflection of Light for Metals
Film Deposition
10. Dimples on fracture surface correspond to microcavities that initiate crack formation.
Domains in Ferromagnetic & Ferrimagnetic Materials
Ductile Materials
Internal magnetic moments
Ductile Fracture
11. Materials change size when temperature is changed
Thermal expansion
Diamagnetic Materials
Response to a Magnetic Field
Charpy or Izod test
12. Defines the ability of a material to resist fracture even when a flaw exists - Directly depends on size of flaw and material properties - K(ic) is a materials constant
Reflectance of Non-Metals
Stress Intensity Factor
Impact energy
Large Hardness
13. Becomes harder (more strain) to stretch (elongate)
Plastic Deformation (Metals)
Work Hardening
Incoherent
Elastic Deformation
14. Growth of an oxide layer by the reaction of oxygen with the substrate - Provides dopant masking and device isolation - IC technology uses 1. Thermal grown oxidation (dry) 2. Wet Oxidation 3. Selective Oxidation
Oxidation
Reflection of Light for Metals
Film Deposition
Diamagnetic Materials
15. Emitted light is in phase
Magnetic Storage Media Types
Color
Coherent
Liquid Crystal Displays (LCD's)
16. Ohms Law: voltage drop = current * resistance
Electrical Conduction
Opacifiers
Relative Permeability
Why do ceramics have larger bonding energy?
17. - Metals that exhibit high ductility - exhibit high toughness. Ceramics are very strong - but have low ductility and low toughness - Polymers are very ductile but are not generally very strong in shear (compared to metals and ceramics). They have low
Reflection of Light for Metals
4 Types of Magnetism
Valence band
Stress Intensity values
18. Process by which metal atoms diffuse because of a potential.
Luminescence
Griffith Crack Model
Electromigration
Pure Semiconductors: Conductivity vs. T
19. They are used to assess properties of ceramics & glasses.
Bending tests
Coefficient of Thermal Expansion
Energy States: Insulators and Semiconductors
Thermal Shock Resistance
20. 1. Data for Pure Silicon - electrical conductivity increases with T - opposite to metals
Work Hardening
Thermal expansion
Reflectance of Non-Metals
Pure Semiconductors: Conductivity vs. T
21. Different orientation of cleavage planes in grains.
Film Deposition
Thermal Shock Resistance
Charpy or Izod test
Why fracture surfaces have faceted texture
22. 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.
Lithography
Slip Bands
Thermal Expansion: Asymmetric curve
Plastic Deformation (Metals)
23. Small Coercivities - Used for electric motors - Example: commercial iron 99.95 Fe
Pure Semiconductors: Conductivity vs. T
Soft Magnetic Materials
Liquid Crystal Displays (LCD's)
Incoherent
24. 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.
Thermal Expansion: Symmetric curve
Lithography
Heat Capacity
Two kinds of Reflection
25. Is analogous to toughness.
Metals: Resistivity vs. T - Impurities
Coefficient of Thermal Expansion
Impact energy
Generation of a Magnetic Field - Within a Solid Material
26. 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
27. 1. Stress-strain behavior is not usually determined via tensile tests 2. Material fails before it yields 3. Bend/flexure tests are often used instead.
Holloman Equation
Impact - Toughness
Brittle Ceramics
The Transistor
28. Typical loading conditions are _____ enough to break all inter-atomic bonds
Not severe
Incident Light
Charpy or Izod test
Thermal Conductivity
29. Occur when lots of dislocations move.
Magnetic Storage
What do magnetic moments arise from?
Superconductivity
Slip Bands
30. 1. Ductility- % elongation - % reduction in area - may be of use in metal forming operations (e.g. - stretch forming). This is convenient for mechanical testing - but not very meaningful for most deformation processing. 2. Toughness- Area beneath str
How to gage the extent of plastic deformation
Slip Bands
Energy States: Insulators and Semiconductors
Thermal Stresses
31. 1. Metals: Thermal energy puts many electrons into a higher energy state. 2. Energy States: Nearby energy states are accessible by thermal fluctuations.
Conduction & Electron Transport
Energy States: Insulators and Semiconductors
Scattering
Opacity
32. Is reflected - absorbed - scattered - and/or transmitted: Io=It+Ia+Ir+Is
Iron-Silicon Alloy in Transformer Cores
Incident Light
Refraction
Shear and Tensile Stress
33. Transformer cores require soft magnetic materials - which are easily magnetized and de-magnetized - and have high electrical resistivity - Energy losses in transformers could be minimized if their cores were fabricated such that the easy magnetizatio
Slip Bands
Iron-Silicon Alloy in Transformer Cores
What do magnetic moments arise from?
Impact energy
34. These materials are relatively unaffected by magnetic fields.
Not severe
Why materials fail in service
Diamagnetic Materials
Electromigration
35. 1. Tc= critical temperature- if T>Tc not superconducting 2. Jc= critical current density - if J>Jc not superconducting 3. Hc= critical magnetic field - if H > Hc not superconducting
Critical Properties of Superconductive Materials
How to gage the extent of plastic deformation
Fourier's Law
Not severe
36. Wet: isotropic - under cut Dry: ansiotropic - directional
Etching
Opacifiers
Insulators
Extrinsic Semiconductors
37. Superconductors expel magnetic fields - This is why a superconductor will float above a magnet.
Metals: Resistivity vs. T - Impurities
Heat Capacity from an Atomic Prospective
Meissner Effect
Electromigration
38. Stress concentration at a crack tips
Fourier's Law
Energy States: Insulators and Semiconductors
Griffith Crack Model
LASER
39. Impurities added to the semiconductor that contribute to excess electrons or holes. Doping = intentional impurities.
Energy States: Insulators and Semiconductors
Brittle Fracture
Extrinsic Semiconductors
Luminescence examples
40. (sigma)=K(sigma)^n . K = strength coefficient - n = work hardening rate or strain hardening exponent. Large n value increases strength and hardness.
Not severe
Luminescence
Holloman Equation
What do magnetic moments arise from?
41. Energy is stored as atomic vibrations - As temperature increases - the average energy of atomic vibrations increases.
Heat Capacity from an Atomic Prospective
Coherent
Why do ceramics have larger bonding energy?
Brittle Fracture
42. 1. Imperfections increase resistivity - grain boundaries - dislocations - impurity atoms - vacancies 2. Resistivity - increases with temperature - wt% impurity - and %CW
Plastic Deformation (Metals)
Metals: Resistivity vs. T - Impurities
Not severe
Reflectance of Non-Metals
43. Increase temperature - increase in interatomic separation - thermal expansion
Stages of Failure: Ductile Fracture
Ductile Materials
Thermal Expansion: Asymmetric curve
Internal magnetic moments
44. 1. Electron motions 2. The spins on electrons - Net atomic magnetic moment: sum of moments from all electrons.
What do magnetic moments arise from?
Fourier's Law
Large Hardness
Fatigue
45. Allows flow of electrons in one direction only (useful to convert alternating current to direct current) - Result: no net current flow
Brittle Materials
Why materials fail in service
IC Devices: P-N Rectifying Junction
Ductile-to-Brittle Transition
46. (sigma)=F/Ai (rho)=(rho)'(1+(epsilon))
Fatigue
Transgranular Fracture
True Stress
Transparent
47. Another optical property - Depends on the wavelength of the visible spectrum.
Internal magnetic moments
Color
True Stress
Domains in Ferromagnetic & Ferrimagnetic Materials
48. Specific heat = energy input/(mass*temperature change)
Force Decomposition
Stress Intensity Factor
Specific Heat
Luminescence
49. - 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
Hysteresis and Permanent Magnetization
Luminescence
Dependence of Heat Capacity on Temperature
Superconductivity
50. 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.
Slip Bands
Color
Shear and Tensile Stress
What do magnetic moments arise from?