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. 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.
What do magnetic moments arise from?
Two kinds of Reflection
Insulators
Fourier's Law
2. 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
Meissner Effect
Reflection of Light for Metals
Coherent
Elastic Deformation
3. Light Amplification by Stimulated Emission of Radiation
Engineering Fracture Performance
LASER
Meissner Effect
Ductile-to-Brittle Transition
4. 1. Necking 2. Cavity formation 3. Cavity coalescence to form cracks 4. Crack propagation (growth) 5. Fracture
Stages of Failure: Ductile Fracture
The Transistor
Generation of a Magnetic Field - Within a Solid Material
Domains in Ferromagnetic & Ferrimagnetic Materials
5. 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
4 Types of Magnetism
Brittle Ceramics
What do magnetic moments arise from?
True Strain
6. 1. General yielding occurs if flaw size a < a(critical) 2. Catastrophic fast fracture occurs if flaw size a > a(critical)
Engineering Fracture Performance
Film Deposition
Metals: Resistivity vs. T - Impurities
Translucent
7. Specular: light reflecting off a mirror (average) - Diffuse: light reflecting off a white wall (local)
Ductile Materials
How to gage the extent of plastic deformation
Two kinds of Reflection
Elastic Deformation
8. Wet: isotropic - under cut Dry: ansiotropic - directional
Intergranular Fracture
Reflection of Light for Metals
Etching
Energy States: Insulators and Semiconductors
9. Without passing a current a continually varying magnetic field will cause a current to flow
Intrinsic Semiconductors
Ductile Fracture
Response to a Magnetic Field
Hardness
10. There is always some statistical distribution of flaws or defects.
Why fracture surfaces have faceted texture
Transgranular Fracture
There is no perfect material?
Dependence of Heat Capacity on Temperature
11. 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
Ductile Fracture
Critical Properties of Superconductive Materials
4 Types of Magnetism
Film Deposition
12. Dramatic change in impact energy is associated with a change in fracture mode from brittle to ductile.
High impact energy
Ductile-to-Brittle Transition
Fatigue
Yield and Reliability
13. (sigma)=K(sigma)^n . K = strength coefficient - n = work hardening rate or strain hardening exponent. Large n value increases strength and hardness.
Charpy or Izod test
What do magnetic moments arise from?
Holloman Equation
Heat Capacity from an Atomic Prospective
14. Diffuse image
Translucent
Yield and Reliability
Relative Permeability
Holloman Equation
15. Occur when lots of dislocations move.
Fatigue
Slip Bands
Ductile Fracture
Impact - Toughness
16. Second phase particles with n > glass.
IC Devices: P-N Rectifying Junction
The Transistor
Shear and Tensile Stress
Opacifiers
17. 1. Insulators: Higher energy states NOT ACCESSIBLE due to gap 2. Semiconductors: Higher energy states separated by a smaller gap.
Refraction
How an LCD works
Electrical Conduction
Energy States: Insulators and Semiconductors
18. Increase temperature - increase in interatomic separation - thermal expansion
Thermal Shock Resistance
Thermal Expansion: Asymmetric curve
Etching
Coherent
19. 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
Ductile-to-Brittle Transition
Pure Semiconductors: Conductivity vs. T
The three modes of crack surface displacement
Thermal Conductivity
20. Cracks pass through grains - often along specific crystal planes.
Why materials fail in service
Transgranular Fracture
Iron-Silicon Alloy in Transformer Cores
Translucent
21. Metals are good conductors since their _______is only partially filled.
Force Decomposition
Intergranular Fracture
Stages of Failure: Ductile Fracture
Valence band
22. 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
Engineering Fracture Performance
Reflectance of Non-Metals
Magnetic Storage
Electrical Conduction
23. Process by which metal atoms diffuse because of a potential.
Electromigration
LASER
There is no perfect material?
Domains in Ferromagnetic & Ferrimagnetic Materials
24. Different orientation of cleavage planes in grains.
Generation of a Magnetic Field - Vacuum
Ductile Fracture
Opaque
Why fracture surfaces have faceted texture
25. 1. Data for Pure Silicon - electrical conductivity increases with T - opposite to metals
Insulators
Plastic Deformation (Metals)
What do magnetic moments arise from?
Pure Semiconductors: Conductivity vs. T
26. Ability to transmit a clear image - The image is clear.
High impact energy
Transparent
True Stress
Response to a Magnetic Field
27. Heat capacity.....- increases with temperature -for solids it reaches a limiting value of 3R
Why do ceramics have larger bonding energy?
Transgranular Fracture
Dependence of Heat Capacity on Temperature
Response to a Magnetic Field
28. Increase temperature - no increase in interatomic separation - no thermal expansion
Iron-Silicon Alloy in Transformer Cores
Elastic Deformation
Thermal Expansion: Symmetric curve
Response to a Magnetic Field
29. Undergo little or no plastic deformation.
Luminescence
Brittle Materials
Thermal Conductivity
Engineering Fracture Performance
30. These materials are relatively unaffected by magnetic fields.
To improve fatigue life
Stress Intensity Factor
Brittle Fracture
Diamagnetic Materials
31. 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 fracture surfaces have faceted texture
Thermal Expansion: Asymmetric curve
Hardness
32. Another optical property - Depends on the wavelength of the visible spectrum.
IC Devices: P-N Rectifying Junction
Color
Film Deposition
Fatigue
33. 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.
Opacifiers
Why do ceramics have larger bonding energy?
Heat Capacity
Electrical Conduction
34. 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
Ductile-to-Brittle Transition
Extrinsic Semiconductors
35. 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
Sparkle of Diamonds
Stress Intensity Factor
HB (Brinell Hardness)
Fatigue
36. The ability of a material to be rapidly cooled and not fracture
Specific Heat
Force Decomposition
Thermal Shock Resistance
Opacifiers
37. - 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
4 Types of Magnetism
Magnetic Storage Media Types
Meissner Effect
38. -> fluorescent light - electron transitions occur randomly - light waves are out of phase with each other.
Impact energy
Film Deposition
Incoherent
Specific Heat
39. This strength parameter is similar in magnitude to a tensile strength. Fracture occurs along the outermost sample edge - which is under a tensile load.
Modulus of Rupture (MOR)
Thermal Expansion: Asymmetric curve
Why fracture surfaces have faceted texture
Incoherent
40. Failure under cyclic stress 1. It can cause part failure - even though (sigma)max < (sigma)c 2. Causes ~90% of mechanical engineering failures.
Luminescence examples
Fatigue
Relative Permeability
True Stress
41. Allows you to calculate what happened G=F' x cos(lambda) - F=F' x cos(phi)
Force Decomposition
Work Hardening
Thermal Shock Resistance
Electrical Conduction
42. Ohms Law: voltage drop = current * resistance
Electrical Conduction
Thermal Expansion: Asymmetric curve
The three modes of crack surface displacement
Hysteresis and Permanent Magnetization
43. 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
44. 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."
Paramagnetic Materials
Charpy or Izod test
Etching
The Transistor
45. 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)
Relative Permeability
Translucent
Charpy or Izod test
Generation of a Magnetic Field - Vacuum
46. 1. Imperfections increase resistivity - grain boundaries - dislocations - impurity atoms - vacancies 2. Resistivity - increases with temperature - wt% impurity - and %CW
Metals: Resistivity vs. T - Impurities
Linewidth
Sparkle of Diamonds
Metallization
47. A high index of refraction (n value) allows for multiple internal reactions.
Sparkle of Diamonds
Electrical Conduction
Why do ceramics have larger bonding energy?
The Transistor
48. They are used to assess properties of ceramics & glasses.
Thermal expansion
Bending tests
Force Decomposition
Dependence of Heat Capacity on Temperature
49. Occur due to: restrained thermal expansion/contraction -temperature gradients that lead to differential dimensional changes sigma = Thermal Stress
Transgranular Fracture
Thermal Stresses
Metals: Resistivity vs. T - Impurities
Magnetic Storage Media Types
50. 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.
Why fracture surfaces have faceted texture
Thermal Conductivity
Thermal Shock Resistance
Hardness