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Worksheets

Thermosetting Plastics, Particle Reinforced Composites Sans

Total questions: 19

Worksheet time: 10mins

Name
Class
Date
1.

Thermosetting plastics are formed by

a)

addition polymerization

b)

copolymerization

c)

condensation polymerization

d)

isomerism

2.

Which of the following is a property of thermosetting plastics?

a)

can be molded

b)

soft

c)

recyclable

d)

can be used at high temperature

3.

Which among these is an example of a commodity thermosetting plastic polymer material?

a)

polyethylene

b)

polypropylene

c)

polystyrene

d)

phenolic

4.

Which of the following is not an example of a thermoplastic polymer?

a)

urethane

b)

melamine

c)

epoxide

d)

acetal

5.

Phenolics are otherwise commonly known

a)

bakelite

b)

polyformaldehyde

c)

urea formaldehyde

d)

melamine formaldehyde

6.

Polyformaldehyde has a good stability up to

a)

50oC

b)

100oC

c)

150oC

d)

250oC

7.

Melamine formaldehyde can be used at temperatures up

a)

65oC

b)

95oC

c)

150oC

d)

240oC

8.

Which plastic material does a combination of dibasic acids and polyhydric alcohols give?

a)

polyester

b)

polyurethane

c)

epoxide

d)

phenolic

9.

A polymer having rubber-like properties is known

a)

thermoset

b)

thermoplastic

c)

elastomer

d)

polyisoprene

10.

Which of the following is used as an adhesive?

a)

epoxide

b)

polyurethane

c)

polyester

d)

phenol formaldehyde

11.

Paraplex is a common trade name for which thermoset?

a)

epoxide

b)

polyester

c)

polyurethane

d)

urea formaldehyde

12.

Urea formaldehyde shares properties and applications with which other thermoset?

a)

phenol formaldehyde

b)

polyurethane

c)

epoxide

d)

melamine formaldehyde

13.

Which of the following is a type of particle-reinforced composites?

a)

continuous

b)

laminates

c)

dispersion-strength

d)

sandwich panels

14.

The below figure represents ______ type of composites.

a)

fiber

b)

particulate

c)

laminar

d)

flake

15.

Cermet is a _______ composite

a)

particle reinforced

b)

fiber reinforced

c)

structural

d)

laminar

16.

How much volume of carbon black is used in automobile tires?

a)

2-3%

b)

8-10%

c)

15-30%

d)

45-50%

17.

High-temperature strength of nickel alloys can be enhanced using dispersed particles of

a)

thorium

b)

arsenic

c)

brmide

d)

antimony

18.

SAP composite stands for ___ composite

a)

strengthened aluminum powder

b)

sintered aluminum powder

c)

strengthened ammonium particulate

d)

sintered aluminum particulate

19.

Which of the following cermet materials is used for rocket motor and jet-engine parts?

a)

tungsten carbide

b)

molybdenum carbide

c)

chromium oxide

d)

titanium bromide