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. Measures Hardness 1. psia = 500 x HB 2. MPa = 3.45 x HB
Liquid Crystal Displays (LCD's)
Opacity
HB (Brinell Hardness)
Intergranular Fracture
2. Width of smallest feature obtainable on Si surface
Linewidth
Scattering
Heat Capacity from an Atomic Prospective
Why materials fail in service
3. Wet: isotropic - under cut Dry: ansiotropic - directional
Impact energy
Coefficient of Thermal Expansion
Etching
What do magnetic moments arise from?
4. The Magnetization of the material - and is essentially the dipole moment per unit volume. It is proportional to the applied field. Xm is the magnetic susceptibility.
Lithography
Electromigration
Opacifiers
M is known as what?
5. 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.
Luminescence examples
Why materials fail in service
Why do ceramics have larger bonding energy?
Generation of a Magnetic Field - Vacuum
6. Cracks propagate along grain boundaries.
How to gage the extent of plastic deformation
Intergranular Fracture
Opacifiers
Incoherent
7. 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
Fatigue
Valence band
LASER
Yield and Reliability
8. Light Amplification by Stimulated Emission of Radiation
Electromigration
Holloman Equation
Slip Bands
LASER
9. A parallel-plate capacitor involves an insulator - or dielectric - between two metal electrodes. The charge density buildup at the capacitor surface is related to the dielectric constant of the material.
There is no perfect material?
Elastic Deformation
Film Deposition
Insulators
10. Heat capacity.....- increases with temperature -for solids it reaches a limiting value of 3R
Ductile Materials
LASER
Dependence of Heat Capacity on Temperature
Thermal Conductivity
11. 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.
Reflectance of Non-Metals
Bending tests
Metallization
Luminescence
12. To build a device - various thin metal or insulating films are grown on top of each other - Evaporation - MBE - Sputtering - CVD (ALD)
Reflectance of Non-Metals
Film Deposition
Plastic Deformation (Metals)
Rockwell
13. Growing interconnections to connect devices -Low electrical resistance - good adhesion to dielectric insulators.
Metallization
Opacifiers
LASER
Opaque
14. 1. Electron motions 2. The spins on electrons - Net atomic magnetic moment: sum of moments from all electrons.
Specific Heat
Internal magnetic moments
Translucent
What do magnetic moments arise from?
15. These materials are relatively unaffected by magnetic fields.
Diamagnetic Materials
Energy States: Insulators and Semiconductors
Generation of a Magnetic Field - Vacuum
Thermal Expansion: Asymmetric curve
16. 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)
Generation of a Magnetic Field - Vacuum
Insulators
There is no perfect material?
Hardness
17. Cracks pass through grains - often along specific crystal planes.
Transgranular Fracture
Energy States: Insulators and Semiconductors
Griffith Crack Model
Hysteresis and Permanent Magnetization
18. No appreciable plastic deformation. The crack propagates very fast; nearly perpendicular to applied stress. Cracks often propagate along specific crystal planes or boundaries.
Translucent
Brittle Fracture
Work Hardening
Holloman Equation
19. Metals are good conductors since their _______is only partially filled.
How an LCD works
Specific Heat
Superconductivity
Valence band
20. Specular: light reflecting off a mirror (average) - Diffuse: light reflecting off a white wall (local)
Two kinds of Reflection
Magnetic Storage Media Types
Insulators
Hysteresis and Permanent Magnetization
21. With Increasing temperature - the saturation magnetization diminishes gradually and then abruptly drops to zero at Curie Temperature - Tc.
Intrinsic Semiconductors
What do magnetic moments arise from?
Large Hardness
Influence of Temperature on Magnetic Behavior
22. These are liquid crystal polymers- not your normal "crystal" -Rigid - rod shaped molecules are aligned even in liquid form.
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
23. 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
Stress Intensity Factor
Not severe
Two kinds of Reflection
Stress Intensity values
24. Ability to transmit a clear image - The image is clear.
Transparent
The three modes of crack surface displacement
How an LCD works
Intergranular Fracture
25. 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.
Two ways to measure heat capacity
Thermal Shock Resistance
Opacity
Heat Capacity from an Atomic Prospective
26. Allows you to calculate what happened G=F' x cos(lambda) - F=F' x cos(phi)
Hysteresis and Permanent Magnetization
Force Decomposition
Paramagnetic Materials
Rockwell
27. 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)
True Stress
Response to a Magnetic Field
Ductile Fracture
Rockwell
28. Dimples on fracture surface correspond to microcavities that initiate crack formation.
Ductile Fracture
IC Devices: P-N Rectifying Junction
Energy States: Insulators and Semiconductors
Slip Bands
29. 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.
Specific Heat
Brittle Ceramics
Lithography
Metallization
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
Why fracture surfaces have faceted texture
How to gage the extent of plastic deformation
Electrical Conduction
Griffith Crack Model
31. Another optical property - Depends on the wavelength of the visible spectrum.
Incident Light
Color
Heat Capacity
Pure Semiconductors: Conductivity vs. T
32. 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.
Shear and Tensile Stress
Griffith Crack Model
Thermal Shock Resistance
Metallization
33. Occur due to: restrained thermal expansion/contraction -temperature gradients that lead to differential dimensional changes sigma = Thermal Stress
Liquid Crystal Displays (LCD's)
Stages of Failure: Ductile Fracture
Coherent
Thermal Stresses
34. Different orientation of cleavage planes in grains.
Why materials fail in service
Influence of Temperature on Magnetic Behavior
Stress Intensity Factor
Why fracture surfaces have faceted texture
35. 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
Two ways to measure heat capacity
Ductile-to-Brittle Transition
Iron-Silicon Alloy in Transformer Cores
Luminescence
36. 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
How to gage the extent of plastic deformation
Electrical Conduction
Hysteresis and Permanent Magnetization
How an LCD works
37. Materials change size when temperature is changed
Thermal expansion
Shear and Tensile Stress
The Transistor
Fourier's Law
38. There is always some statistical distribution of flaws or defects.
Film Deposition
Thermal Expansion: Asymmetric curve
Luminescence examples
There is no perfect material?
39. Emitted light is in phase
Metallization
Coherent
Griffith Crack Model
Liquid Crystal Displays (LCD's)
40. Process by which geometric patterns are transferred from a mask (reticle) to a surface of a chip to form the device.
Intergranular Fracture
Impact energy
Hysteresis and Permanent Magnetization
Lithography
41. Resistance to plastic deformation of cracking in compression - and better wear properties.
Large Hardness
Thermal Expansion: Symmetric curve
Incoherent
Intergranular Fracture
42. Elastic means reversible! This is not a permanent deformation.
Elastic Deformation
True Strain
Metallization
Meissner Effect
43. Found in 26 metals and hundreds of alloys & compounds - Tc= critical temperature = termperature below which material is superconductive.
Superconductivity
Dependence of Heat Capacity on Temperature
Reflection of Light for Metals
Insulators
44. As the applied field (H) increases the magnetic domains change shape and size by movement of domain boundaries.
Work Hardening
Impact energy
Domains in Ferromagnetic & Ferrimagnetic Materials
Iron-Silicon Alloy in Transformer Cores
45. Undergo extensive plastic deformation prior to failure.
Ductile Materials
Critical Properties of Superconductive Materials
There is no perfect material?
Magnetic Storage
46. Is reflected - absorbed - scattered - and/or transmitted: Io=It+Ia+Ir+Is
Intrinsic Semiconductors
Iron-Silicon Alloy in Transformer Cores
Luminescence examples
Incident Light
47. Sigma=ln(li/lo)
Valence band
Where does DBTT occur?
Reflectance of Non-Metals
True Strain
48. Cp: Heat capacity at constant pressure Cv: Heat capacity at constant volume.
Two ways to measure heat capacity
Thermal Conductivity
Yield and Reliability
Shear and Tensile Stress
49. ...occurs in bcc metals but not in fcc metals.
Brittle Materials
Brittle Fracture
Where does DBTT occur?
Paramagnetic Materials
50. 1. Data for Pure Silicon - electrical conductivity increases with T - opposite to metals
Pure Semiconductors: Conductivity vs. T
Fatigue
Transparent
Refraction