30 Questions
What is the primary purpose of identifying the required properties in the materials selection process?
To identify the candidate material
What is the primary factor that determines the properties required of a material?
The in-service conditions
What is the effect of processing on the structure of a material?
It changes the structure and overall shape of the material
What is the typical outcome of a material selection process?
A material with a compromise of properties
What is the primary reason for considering the economic or cost aspect in material selection?
To evaluate the cost of the fabricated piece
What is the primary purpose of characterizing the in-service conditions?
To determine the properties required of the material
What is the primary basis for classifying solid materials?
Chemistry and atomic structure
What type of materials are comprised of metallic and non-metallic elements?
Ceramics
What is an example of a composite material?
Fiberglass
What are metals primarily composed of?
One or more metallic elements
What type of materials are composed of carbon, hydrogen, and other non-metallic elements?
Polymers
What is the characteristic of composites?
They consist of more than one material type
What is the primary characteristic that distinguishes nanomaterials from other materials?
Their size, with dimensions on the order of a nanometer
Why are small nanoparticles known to have high chemical reactivities?
Because they have a large surface area-to-volume ratio
What is a concern regarding the safety of nanomaterials?
That they may be absorbed into the body at relatively high rates
What is a potential health risk of nanomaterials?
Damaging DNA or promoting lung cancer
How can nanomaterials potentially enter the body?
Through the skin, lungs, and digestive tract
What is a way to classify solid materials?
According to the regularity of their atomic arrangement
What is the role of the recording head in magnetic storage?
To magnetize the recording medium
What is the effect of adding 3 atomic % Si to Fe on its magnetic permeability?
It increases its magnetic permeability
What is the relationship between the structure of aluminum oxide and its transparency?
Polycrystal aluminum oxide with high porosity is translucent
What is the effect of stress and saltwater on materials?
It causes the material to crack
What is the effect of heat treatment on the crack speed in saltwater?
It slows down the crack speed in saltwater
Which of the following is NOT a characteristic of magnetic storage?
The material is transparent
What is the coordination number for the Body-Centered Cubic (BCC) crystal structure?
8
What is the atomic packing factor for the BCC crystal structure?
0.68
What type of crystal structure has a cubic unit cell with atoms located at all eight corners and a single atom at the cube center?
Body-Centered Cubic (BCC)
What is the purpose of deriving the expression for the volume of a BCC cell in terms of the atomic radius R?
To determine the density of the material
What is the shape of the unit cell in a BCC crystal structure?
Cubic
What is the significance of the atomic radius R in the context of crystal structures?
It is a measure of the distance between atoms in a crystal structure
This quiz covers the relationship between cooling rate and structure of steel, as well as the materials selection process. It includes concepts such as mechanical, electrical, thermal, and magnetic properties.
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