Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Polymerization – Composite Materials
1 - Question
Composite materials are a plastic matrix.
a) True
b) False
View Answer
Explanation: Composite materials are reinforced plastics in which a strong ceramic or other fibre is positioned in a plastic matrix. The original material in this category was glass fibre reinforced resins.
2 - Question
How is carbon fibre manufactured?
a) Heating
b) Thermal degradation of PAN
c) Cooling of PAN
d) Thermal degradation of polyethylene
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Explanation: Industrial manufacture of carbon fibre is based on the thermal degradation of non-melting organic polymers such as polyacrylonitrile (PAN). Mechanical properties attainable with carbon fibres is dependent upon the crystallinity.
3 - Question
Asbestos is used in reinforcing fibre.
a) True
b) False
View Answer
Explanation: The carcinogenic properties of fine asbestos fibres have decreased its use. It causes serious health hazards. So, it is not used in reinforcing fibre.
4 - Question
What are the sequence of steps involved in the manufacture of carbon fibre?
a) Cooling-Carbonization-Graphitization
b) Graphitization-Carbonization-Cooling
c) Heating-Carbonization-Graphitization
d) Graphitization-Carbonization-Heating
View Answer
Explanation: The PAN fibres are first preheated to 300°C and the undergoes carbonization at 1600°C till a high strength carbon fibre is formed. Finally, it undergoes graphitization at temperature up to 3000°C.