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. Cracks pass through grains - often along specific crystal planes.
Dependence of Heat Capacity on Temperature
Shear and Tensile Stress
Transgranular Fracture
Linewidth
2. - A magnetic field is induced in the material B= Magnetic Induction (tesla) inside the material mu= permeability of a solid
Oxidation
Generation of a Magnetic Field - Within a Solid Material
The three modes of crack surface displacement
Diamagnetic Materials
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
Electrical Conduction
Impact energy
Thermal Shock Resistance
Impact - Toughness
4. Light Amplification by Stimulated Emission of Radiation
Charpy or Izod test
Thermal Conductivity
Electrical Conduction
LASER
5. Is analogous to toughness.
Soft Magnetic Materials
Impact energy
Why fracture surfaces have faceted texture
Transparent
6. Materials change size when temperature is changed
Thermal expansion
Insulators
Reflectance of Non-Metals
Magnetic Storage
7. Elastic means reversible! This is not a permanent deformation.
Generation of a Magnetic Field - Within a Solid Material
Heat Capacity from an Atomic Prospective
Elastic Deformation
Scattering
8. 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
How an LCD works
Lithography
Domains in Ferromagnetic & Ferrimagnetic Materials
Force Decomposition
9. A measure of the ease with which a B field can be induced inside a material.
HB (Brinell Hardness)
Ductile Fracture
Relative Permeability
Reflection of Light for Metals
10. 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.
Magnetic Storage Media Types
Thermal Shock Resistance
Shear and Tensile Stress
M is known as what?
11. They are used to assess properties of ceramics & glasses.
Elastic Deformation
Bending tests
Extrinsic Semiconductors
Linewidth
12. (sigma)=F/Ai (rho)=(rho)'(1+(epsilon))
Two ways to measure heat capacity
True Stress
Soft Magnetic Materials
Conduction & Electron Transport
13. 1. Metals: Thermal energy puts many electrons into a higher energy state. 2. Energy States: Nearby energy states are accessible by thermal fluctuations.
Luminescence examples
Conduction & Electron Transport
Intrinsic Semiconductors
Not severe
14. 1. Insulators: Higher energy states NOT ACCESSIBLE due to gap 2. Semiconductors: Higher energy states separated by a smaller gap.
Energy States: Insulators and Semiconductors
Magnetic Storage
Film Deposition
Two ways to measure heat capacity
15. Allows you to calculate what happened G=F' x cos(lambda) - F=F' x cos(phi)
Soft Magnetic Materials
Why do ceramics have larger bonding energy?
To improve fatigue life
Force Decomposition
16. 1. Impose a compressive surface stress (to suppress surface cracks from growing) - Method 1: shot peening - Method 2: carburizing 2.Remove stress concentrators.
To improve fatigue life
How to gage the extent of plastic deformation
Valence band
Extrinsic Semiconductors
17. Typical loading conditions are _____ enough to break all inter-atomic bonds
Brittle Ceramics
Not severe
Why materials fail in service
Coefficient of Thermal Expansion
18. 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
19. Stress concentration at a crack tips
Electromigration
Meissner Effect
Influence of Temperature on Magnetic Behavior
Griffith Crack Model
20. Metals are good conductors since their _______is only partially filled.
Pure Semiconductors: Conductivity vs. T
Why materials fail in service
Yield and Reliability
Valence band
21. Flaws and Defects - They concentrate stress locally to levels high enough to rupture bonds.
Work Hardening
Conduction & Electron Transport
Two ways to measure heat capacity
Why materials fail in service
22. This strength parameter is similar in magnitude to a tensile strength. Fracture occurs along the outermost sample edge - which is under a tensile load.
Transgranular Fracture
Modulus of Rupture (MOR)
Large Hardness
Intrinsic Semiconductors
23. Measures Hardness 1. psia = 500 x HB 2. MPa = 3.45 x HB
Sparkle of Diamonds
Iron-Silicon Alloy in Transformer Cores
Why do ceramics have larger bonding energy?
HB (Brinell Hardness)
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)
Work Hardening
Generation of a Magnetic Field - Vacuum
Hysteresis and Permanent Magnetization
Diamagnetic Materials
25. ...occurs in bcc metals but not in fcc metals.
How to gage the extent of plastic deformation
Work Hardening
Where does DBTT occur?
Force Decomposition
26. 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
Iron-Silicon Alloy in Transformer Cores
Specific Heat
Yield and Reliability
Slip Bands
27. Energy is stored as atomic vibrations - As temperature increases - the average energy of atomic vibrations increases.
Heat Capacity from an Atomic Prospective
Superconductivity
To improve fatigue life
Griffith Crack Model
28. 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
Shear and Tensile Stress
Magnetic Storage
Insulators
The Transistor
29. 1. Electron motions 2. The spins on electrons - Net atomic magnetic moment: sum of moments from all electrons.
Internal magnetic moments
What do magnetic moments arise from?
The three modes of crack surface displacement
Hysteresis and Permanent Magnetization
30. Is reflected - absorbed - scattered - and/or transmitted: Io=It+Ia+Ir+Is
Large Hardness
Incident Light
Response to a Magnetic Field
Extrinsic Semiconductors
31. 1. Tensile (opening) 2. Sliding 3. Tearing
Valence band
Iron-Silicon Alloy in Transformer Cores
Work Hardening
The three modes of crack surface displacement
32. The ability of a material to be rapidly cooled and not fracture
Insulators
Thermal Shock Resistance
Impact energy
Liquid Crystal Displays (LCD's)
33. Small Coercivities - Used for electric motors - Example: commercial iron 99.95 Fe
Relative Permeability
Soft Magnetic Materials
Coherent
Electromigration
34. 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.
Griffith Crack Model
Influence of Temperature on Magnetic Behavior
Energy States: Insulators and Semiconductors
Insulators
35. Another optical property - Depends on the wavelength of the visible spectrum.
Transparent
Response to a Magnetic Field
Opacity
Color
36. - 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
Where does DBTT occur?
Heat Capacity
Ductile Fracture
Luminescence
37. 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
Diamagnetic Materials
Liquid Crystal Displays (LCD's)
Oxidation
Thermal expansion
38. To build a device - various thin metal or insulating films are grown on top of each other - Evaporation - MBE - Sputtering - CVD (ALD)
LASER
Holloman Equation
To improve fatigue life
Film Deposition
39. Diffuse image
High impact energy
M is known as what?
Brittle Ceramics
Translucent
40. 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)
Brittle Materials
Superconductivity
The three modes of crack surface displacement
41. Becomes harder (more strain) to stretch (elongate)
Work Hardening
Large Hardness
The three modes of crack surface displacement
Transgranular Fracture
42. Different orientation of cleavage planes in grains.
Why fracture surfaces have faceted texture
Stages of Failure: Ductile Fracture
Film Deposition
Electrical Conduction
43. 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.
Thermal expansion
Opacity
Rockwell
Fourier's Law
44. There is always some statistical distribution of flaws or defects.
There is no perfect material?
LASER
Electrical Conduction
Pure Semiconductors: Conductivity vs. T
45. 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
Stress Intensity values
Thermal Stresses
Luminescence examples
46. Occur due to: restrained thermal expansion/contraction -temperature gradients that lead to differential dimensional changes sigma = Thermal Stress
Thermal Expansion: Symmetric curve
Hysteresis and Permanent Magnetization
Specific Heat
Thermal Stresses
47. Large coercivities - Used for permanent magnets - Add particles/voids to inhibit domain wall motion - Example: tungsten steel
True Stress
Stress Intensity values
Hard Magnetic Materials
Engineering Fracture Performance
48. If a material has ________ - then the field generated by those moments must be added to the induced field.
Internal magnetic moments
Soft Magnetic Materials
Why do ceramics have larger bonding energy?
Magnetic Storage
49. 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)
Rockwell
What do magnetic moments arise from?
Response to a Magnetic Field
Large Hardness
50. -> fluorescent light - electron transitions occur randomly - light waves are out of phase with each other.
Heat Capacity
Incoherent
Work Hardening
Superconductivity