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.
Transgranular Fracture
Thermal expansion
Where does DBTT occur?
Ductile Materials
2. Second phase particles with n > glass.
Opacifiers
Opacity
Why materials fail in service
Extrinsic Semiconductors
3. 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
Magnetic Storage
Linewidth
Paramagnetic Materials
Work Hardening
4. 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
Electrical Conduction
Intrinsic Semiconductors
Superconductivity
5. They are used to assess properties of ceramics & glasses.
High impact energy
Fourier's Law
Thermal expansion
Bending tests
6. 1. Electron motions 2. The spins on electrons - Net atomic magnetic moment: sum of moments from all electrons.
Electromigration
What do magnetic moments arise from?
Film Deposition
Intergranular Fracture
7. Another optical property - Depends on the wavelength of the visible spectrum.
Color
Force Decomposition
Sparkle of Diamonds
Stress Intensity Factor
8. Measures Hardness 1. psia = 500 x HB 2. MPa = 3.45 x HB
HB (Brinell Hardness)
Extrinsic Semiconductors
Bending tests
Meissner Effect
9. 1. Tensile (opening) 2. Sliding 3. Tearing
Opaque
Stress Intensity values
Slip Bands
The three modes of crack surface displacement
10. Wet: isotropic - under cut Dry: ansiotropic - directional
Etching
Ductile-to-Brittle Transition
Intrinsic Semiconductors
What do magnetic moments arise from?
11. Ohms Law: voltage drop = current * resistance
Electrical Conduction
Superconductivity
Generation of a Magnetic Field - Vacuum
Opacity
12. 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
M is known as what?
Oxidation
Brittle Materials
Luminescence
13. Without passing a current a continually varying magnetic field will cause a current to flow
Why do ceramics have larger bonding energy?
Engineering Fracture Performance
Liquid Crystal Displays (LCD's)
Response to a Magnetic Field
14. Allows flow of electrons in one direction only (useful to convert alternating current to direct current) - Result: no net current flow
Impact energy
How an LCD works
IC Devices: P-N Rectifying Junction
Thermal Expansion: Asymmetric curve
15. Different orientation of cleavage planes in grains.
Transparent
Why fracture surfaces have faceted texture
Thermal Conductivity
Critical Properties of Superconductive Materials
16. ...occurs in bcc metals but not in fcc metals.
Where does DBTT occur?
Specific Heat
The Transistor
Hard Magnetic Materials
17. 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.
Internal magnetic moments
Transparent
Brittle Ceramics
Shear and Tensile Stress
18. Occurs at a single pore or other solid by refraction n = 1 for pore (air) n > 1 for the solid - n ~ 1.5 for glass - Scattering effect is maximized by pore/particle size within 400-700 nm range - Reason for Opacity in ceramics - glasses and polymers.
Why fracture surfaces have faceted texture
Scattering
Metallization
M is known as what?
19. (sigma)=K(sigma)^n . K = strength coefficient - n = work hardening rate or strain hardening exponent. Large n value increases strength and hardness.
Electrical Conduction
Internal magnetic moments
Liquid Crystal Displays (LCD's)
Holloman Equation
20. Energy is stored as atomic vibrations - As temperature increases - the average energy of atomic vibrations increases.
Valence band
Metals: Resistivity vs. T - Impurities
Heat Capacity from an Atomic Prospective
Reflectance of Non-Metals
21. 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
Transparent
Where does DBTT occur?
Hysteresis and Permanent Magnetization
Rockwell
22. 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.
Generation of a Magnetic Field - Vacuum
Heat Capacity
Brittle Ceramics
Extrinsic Semiconductors
23. 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
What do magnetic moments arise from?
Internal magnetic moments
How to gage the extent of plastic deformation
24. 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.
Brittle Materials
High impact energy
Why materials fail in service
Reflectance of Non-Metals
25. - 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
Work Hardening
How an LCD works
Luminescence
Stress Intensity values
26. 1. Necking 2. Cavity formation 3. Cavity coalescence to form cracks 4. Crack propagation (growth) 5. Fracture
How to gage the extent of plastic deformation
Large Hardness
Stages of Failure: Ductile Fracture
Luminescence examples
27. Increase temperature - no increase in interatomic separation - no thermal expansion
Thermal Expansion: Symmetric curve
Modulus of Rupture (MOR)
Electromigration
Energy States: Insulators and Semiconductors
28. Typical loading conditions are _____ enough to break all inter-atomic bonds
Why materials fail in service
The Transistor
Ductile-to-Brittle Transition
Not severe
29. 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.
Specific Heat
Thermal Shock Resistance
Large Hardness
Plastic Deformation (Metals)
30. Allows you to calculate what happened G=F' x cos(lambda) - F=F' x cos(phi)
Fourier's Law
Hardness
Force Decomposition
Impact energy
31. # of thermally generated electrons = # of holes (broken bonds)
Opacity
Luminescence
Intrinsic Semiconductors
Two ways to measure heat capacity
32. 1. Data for Pure Silicon - electrical conductivity increases with T - opposite to metals
Coefficient of Thermal Expansion
Pure Semiconductors: Conductivity vs. T
Color
Dependence of Heat Capacity on Temperature
33. -> fluorescent light - electron transitions occur randomly - light waves are out of phase with each other.
Elastic Deformation
Critical Properties of Superconductive Materials
Incoherent
Generation of a Magnetic Field - Vacuum
34. Emitted light is in phase
Coherent
How an LCD works
Force Decomposition
Two ways to measure heat capacity
35. - A magnetic field is induced in the material B= Magnetic Induction (tesla) inside the material mu= permeability of a solid
Dependence of Heat Capacity on Temperature
Generation of a Magnetic Field - Within a Solid Material
Electrical Conduction
To improve fatigue life
36. A measure of the ease with which a B field can be induced inside a material.
Luminescence
Internal magnetic moments
There is no perfect material?
Relative Permeability
37. If a material has ________ - then the field generated by those moments must be added to the induced field.
Brittle Fracture
Internal magnetic moments
Fatigue
Transgranular Fracture
38. High toughness; material resists crack propagation.
High impact energy
Two ways to measure heat capacity
Insulators
Reflection of Light for Metals
39. Stress concentration at a crack tips
IC Devices: P-N Rectifying Junction
Modulus of Rupture (MOR)
Sparkle of Diamonds
Griffith Crack Model
40. 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.
How an LCD works
Griffith Crack Model
Hardness
Luminescence
41. Resistance to plastic deformation of cracking in compression - and better wear properties.
Bending tests
Large Hardness
True Strain
Transgranular Fracture
42. 1. Imperfections increase resistivity - grain boundaries - dislocations - impurity atoms - vacancies 2. Resistivity - increases with temperature - wt% impurity - and %CW
Electromigration
What do magnetic moments arise from?
Opaque
Metals: Resistivity vs. T - Impurities
43. Process by which geometric patterns are transferred from a mask (reticle) to a surface of a chip to form the device.
Lithography
Transgranular Fracture
Ductile Materials
Why do ceramics have larger bonding energy?
44. Light Amplification by Stimulated Emission of Radiation
Slip Bands
LASER
Thermal Expansion: Asymmetric curve
Response to a Magnetic Field
45. The ability of a material to be rapidly cooled and not fracture
Thermal Shock Resistance
Refraction
Modulus of Rupture (MOR)
Energy States: Insulators and Semiconductors
46. Heat capacity.....- increases with temperature -for solids it reaches a limiting value of 3R
High impact energy
Hard Magnetic Materials
Dependence of Heat Capacity on Temperature
Two kinds of Reflection
47. 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.
Thermal Shock Resistance
Specific Heat
M is known as what?
Thermal Expansion: Asymmetric curve
48. Found in 26 metals and hundreds of alloys & compounds - Tc= critical temperature = termperature below which material is superconductive.
Why fracture surfaces have faceted texture
Superconductivity
To improve fatigue life
Metallization
49. Dramatic change in impact energy is associated with a change in fracture mode from brittle to ductile.
Transgranular Fracture
Lithography
Refraction
Ductile-to-Brittle Transition
50. Undergo little or no plastic deformation.
Luminescence examples
Brittle Materials
Transparent
Holloman Equation
Sorry!:) No result found.
Can you answer 50 questions in 15 minutes?
Let me suggest you:
Browse all subjects
Browse all tests
Most popular tests
Major Subjects
Tests & Exams
AP
CLEP
DSST
GRE
SAT
GMAT
Certifications
CISSP go to https://www.isc2.org/
PMP
ITIL
RHCE
MCTS
More...
IT Skills
Android Programming
Data Modeling
Objective C Programming
Basic Python Programming
Adobe Illustrator
More...
Business Skills
Advertising Techniques
Business Accounting Basics
Business Strategy
Human Resource Management
Marketing Basics
More...
Soft Skills
Body Language
People Skills
Public Speaking
Persuasion
Job Hunting And Resumes
More...
Vocabulary
GRE Vocab
SAT Vocab
TOEFL Essential Vocab
Basic English Words For All
Global Words You Should Know
Business English
More...
Languages
AP German Vocab
AP Latin Vocab
SAT Subject Test: French
Italian Survival
Norwegian Survival
More...
Engineering
Audio Engineering
Computer Science Engineering
Aerospace Engineering
Chemical Engineering
Structural Engineering
More...
Health Sciences
Basic Nursing Skills
Health Science Language Fundamentals
Veterinary Technology Medical Language
Cardiology
Clinical Surgery
More...
English
Grammar Fundamentals
Literary And Rhetorical Vocab
Elements Of Style Vocab
Introduction To English Major
Complete Advanced Sentences
Literature
Homonyms
More...
Math
Algebra Formulas
Basic Arithmetic: Measurements
Metric Conversions
Geometric Properties
Important Math Facts
Number Sense Vocab
Business Math
More...
Other Major Subjects
Science
Economics
History
Law
Performing-arts
Cooking
Logic & Reasoning
Trivia
Browse all subjects
Browse all tests
Most popular tests