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Materials
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Test knowledge of Fundamentals Materials section
Flashcards
12 cards
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Practice quiz
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Questions
12
Answers
1
Which material has a sharp melting point and high shrinkage?
Semi Crystalline
Amorphous
Thermoplastic
Thermoset
2
Degraded plastics will?
Make parts stronger
Increase chemical resistance
Make parts brittle
Become clear
3
Which is used to make plastic?
Corn (Agriculture)
All are used to make plastic
Natural Gas
Oil
4
Plastics are polymers plus ?
Copolymers
Agriculture
Nitrogen
Additives
5
Which material has a higher viscosity (is thicker), a 20 MFI or a 40 MFI?
40
20
6
Longer polymer chains are weaker than shorter chains?
False
True
7
Amorphous materials would be used if contacting chemicals?
False
True
8
Which material would you use for a lens?
Thermoplastic
Amorphous
Thermoset
Semicrystalline
9
Polymers are made from single unit called...
a compound
an element
a monomer
a cell
10
Thermoplastics do all of the following EXCEPT?
Have limited high temp use
Harden when heated
Melt when heated
Can be reheated
11
Plastics that absorb moisture are known as?
Saturated
Hygroscopic
Hydroscopic
Condensation
12
The term that defines how easily a fluid flows
Viscosity
Velocity
Pressure Loss
Hygroscopic
