3. The main function of the initiators in the addition polymerisation process is

Question

3. The main function of the initiators in the addition polymerisation process is to
a.
stabilise the mers and the ends of the growing polymers

b.
reduce the melting point

c.
strengthen the polymer

d.
reduce the cost of the polymer

e.
None of the above



4. Copolymerisation process performed to
a.
improve the mechanical properties of the individual polymers

b.
reduce the cost of the individual polymers

c.
crystallise the linear polymer

d.
stabilise the mers and end the growth of individual polymers

e.
None of the above



5. There are some differences between linear and network polymers, except that
a.
linear polymers have relatively low melting point.

b.
linear polymers have relatively low mechanical properties.

c.
linear polymers have relatively low mechanical properties.

d.
linear polymers cannot be recycled.

e.
None of the above



6. Polymers can be divided into many types, which one of the following polymers exhibit very large and reversible strain
a.
Elastomers

b.
Thermoset

c.
Thermoplastic

d.
Copolymer

e.
None of the above



7. Position of side group on the main chain of polymers highly influences the mechanical properties of the polymer. Which one of the following arrangements introduces relatively high strength
a.
Isotactic

b.
Syndiotactic

c.
Atactic

d.
Random copolymer

e.
None of the above



8. Temperature has very high effect on the mechanical properties of thermoplastic polymers. Which one of the following statement is correct
a.
Increase the temperature decreases the modules of elasticity

b.
Increase the temperature increases the modules of elasticity

c.
Increase the temperature increases the ultimate strength

d.
Increase the temperature increases the yield strength

e.
None of the above



9. Each type of polymer has difference tensile behaviour, which one of the following types exhibits brittle nature at room temperature
a.
Network

b.
Linear

c.
Elastomers

d.
Linear and network

e.
None of the above



10. Which one of the following polymers is recommended for bearing applications
a.
Polyamides

b.
Epoxy

c.
Polyester

d.
Rubber

e.
None of the above



11. Silicon-oxygen tetrahedron is the basic structural unit of all silicates. It contains of
a.
One silicon atom surrounded by four oxygen tomes

b.
Two silicon atom surrounded by four oxygen tomes

c.
One silicon atom surrounded by two oxygen tomes

d.
Three silicon atom surrounded by one oxygen tomes

e.
None of the above



12. In the clay processes, firing causes major changes in the product volume. Which one of the following statements is correct
a.
At very high level of temperature (above 800

Explanation / Answer

3. b. reduce the melting point

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