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. Occur when lots of dislocations move.
Generation of a Magnetic Field - Vacuum
Slip Bands
True Strain
Yield and Reliability
2. - 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
Stress Intensity values
The Transistor
Ductile Fracture
Lithography
3. Growing interconnections to connect devices -Low electrical resistance - good adhesion to dielectric insulators.
Metallization
Response to a Magnetic Field
Superconductivity
Elastic Deformation
4. 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.
Opaque
Brittle Fracture
Modulus of Rupture (MOR)
Conduction & Electron Transport
5. Increase temperature - increase in interatomic separation - thermal expansion
Bending tests
Why fracture surfaces have faceted texture
Holloman Equation
Thermal Expansion: Asymmetric curve
6. 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.
M is known as what?
Slip Bands
Two ways to measure heat capacity
Stress Intensity Factor
7. Small Coercivities - Used for electric motors - Example: commercial iron 99.95 Fe
Internal magnetic moments
Thermal Stresses
Reflectance of Non-Metals
Soft Magnetic Materials
8. Impurities added to the semiconductor that contribute to excess electrons or holes. Doping = intentional impurities.
Liquid Crystal Displays (LCD's)
Extrinsic Semiconductors
Brittle Fracture
Rockwell
9. Specular: light reflecting off a mirror (average) - Diffuse: light reflecting off a white wall (local)
Luminescence examples
Where does DBTT occur?
What do magnetic moments arise from?
Two kinds of Reflection
10. 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.
Incident Light
The Transistor
Luminescence examples
Where does DBTT occur?
11. The size of the material changes with a change in temperature - polymers have the largest values
Luminescence examples
Coefficient of Thermal Expansion
Shear and Tensile Stress
How an LCD works
12. Failure under cyclic stress 1. It can cause part failure - even though (sigma)max < (sigma)c 2. Causes ~90% of mechanical engineering failures.
Specific Heat
Thermal Expansion: Symmetric curve
Fatigue
Refraction
13. If a material has ________ - then the field generated by those moments must be added to the induced field.
Translucent
To improve fatigue life
Brittle Materials
Internal magnetic moments
14. 1. Necking 2. Cavity formation 3. Cavity coalescence to form cracks 4. Crack propagation (growth) 5. Fracture
Metals: Resistivity vs. T - Impurities
Thermal Conductivity
Stages of Failure: Ductile Fracture
Impact energy
15. Superconductors expel magnetic fields - This is why a superconductor will float above a magnet.
Liquid Crystal Displays (LCD's)
Meissner Effect
Internal magnetic moments
Translucent
16. Heat capacity.....- increases with temperature -for solids it reaches a limiting value of 3R
Dependence of Heat Capacity on Temperature
The three modes of crack surface displacement
Translucent
High impact energy
17. High toughness; material resists crack propagation.
Iron-Silicon Alloy in Transformer Cores
Not severe
Ductile Materials
High impact energy
18. 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.
Plastic Deformation (Metals)
Refraction
Brittle Ceramics
Thermal Shock Resistance
19. Transmitted light distorts electron clouds - The velocity of light in a material is lower than in a vacuum - Adding large ions to glass decreases the speed of light in the glass - Light can be "bent" (or refracted) as it passes through a transparent
The three modes of crack surface displacement
Dependence of Heat Capacity on Temperature
Magnetic Storage Media Types
Refraction
20. Undergo little or no plastic deformation.
IC Devices: P-N Rectifying Junction
Brittle Materials
Magnetic Storage Media Types
Etching
21. There is always some statistical distribution of flaws or defects.
Sparkle of Diamonds
There is no perfect material?
Reflectance of Non-Metals
M is known as what?
22. Sigma=ln(li/lo)
True Strain
Etching
Opaque
Not severe
23. A measure of the ease with which a B field can be induced inside a material.
Force Decomposition
Modulus of Rupture (MOR)
Relative Permeability
Electrical Conduction
24. 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
Modulus of Rupture (MOR)
Transgranular Fracture
True Stress
Yield and Reliability
25. Process by which metal atoms diffuse because of a potential.
To improve fatigue life
Large Hardness
Electromigration
Thermal Expansion: Asymmetric curve
26. 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
Bending tests
The Transistor
Generation of a Magnetic Field - Vacuum
Magnetic Storage Media Types
27. Different orientation of cleavage planes in grains.
Opacity
Valence band
Why fracture surfaces have faceted texture
Incoherent
28. Width of smallest feature obtainable on Si surface
Linewidth
Why materials fail in service
Two ways to measure heat capacity
How an LCD works
29. Dramatic change in impact energy is associated with a change in fracture mode from brittle to ductile.
Ductile-to-Brittle Transition
Linewidth
Thermal Conductivity
Incoherent
30. Cracks pass through grains - often along specific crystal planes.
Transgranular Fracture
Impact energy
Large Hardness
Lithography
31. 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
32. Cracks propagate along grain boundaries.
Fourier's Law
Response to a Magnetic Field
Thermal Stresses
Intergranular Fracture
33. 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
34. Measures Hardness 1. psia = 500 x HB 2. MPa = 3.45 x HB
Yield and Reliability
Iron-Silicon Alloy in Transformer Cores
HB (Brinell Hardness)
Charpy or Izod test
35. Resistance to plastic deformation of cracking in compression - and better wear properties.
Generation of a Magnetic Field - Within a Solid Material
Bending tests
Thermal Shock Resistance
Large Hardness
36. These materials are relatively unaffected by magnetic fields.
Lithography
Diamagnetic Materials
Influence of Temperature on Magnetic Behavior
Sparkle of Diamonds
37. Stress concentration at a crack tips
Griffith Crack Model
Stress Intensity Factor
Holloman Equation
The three modes of crack surface displacement
38. 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
Fourier's Law
Hysteresis and Permanent Magnetization
Impact energy
Yield and Reliability
39. 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
Two ways to measure heat capacity
Hard Magnetic Materials
Impact - Toughness
Hardness
40. 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
Dependence of Heat Capacity on Temperature
Transparent
How an LCD works
Fatigue
41. - A magnetic field is induced in the material B= Magnetic Induction (tesla) inside the material mu= permeability of a solid
Generation of a Magnetic Field - Within a Solid Material
Luminescence
Metals: Resistivity vs. T - Impurities
Griffith Crack Model
42. Wet: isotropic - under cut Dry: ansiotropic - directional
Relative Permeability
Etching
Internal magnetic moments
Hardness
43. 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.
Incoherent
Oxidation
Impact energy
Insulators
44. (sigma)=F/Ai (rho)=(rho)'(1+(epsilon))
Luminescence examples
Reflection of Light for Metals
Specific Heat
True Stress
45. 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)
Specific Heat
Rockwell
Linewidth
Domains in Ferromagnetic & Ferrimagnetic Materials
46. Ability to transmit a clear image - The image is clear.
Reflection of Light for Metals
Dependence of Heat Capacity on Temperature
Lithography
Transparent
47. Is analogous to toughness.
Incoherent
Fatigue
Refraction
Impact energy
48. 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
What do magnetic moments arise from?
Coherent
Magnetic Storage
Paramagnetic Materials
49. Materials change size when temperature is changed
Holloman Equation
Stages of Failure: Ductile Fracture
Ductile-to-Brittle Transition
Thermal expansion
50. Another optical property - Depends on the wavelength of the visible spectrum.
Rockwell
Color
Stress Intensity values
Soft Magnetic Materials