Machine Design Multiple Choice Questions on “Ceramics & Plastics”.
1. Ceramics consist of
a) ionic & covalent bonding
b) covalent bonding
c) hydrogen bonding
d) none of the mentioned
Answer: a
Clarification: Ceramics consists of ionic and covalent bonds only.There is no hydrogen compound so no case of H boding.
2. All ceramics contain clay.
a) True
b) False
Answer: b
Clarification: No this may sound convincing but all ceramics don’t contain clay.
3. The densities of ceramics are low.
a) True
b) False
Answer: a
Clarification: In ceramics, different oxides and carbides are not compactly bonded.
4. There are small voids in ceramics structure.
a) True
b) False
Answer: a
Clarification: Compounds are less compactly bonded and hence voids are formed.
5. Which of the following properties are true for ceramics.
a) light weight construction with low inertia force
b) excellent wear
c) lower friction loss
d) all of the mentioned
Answer: d
Clarification: Properties of ceramics.
6. Paraffin wax is represented by
a) C18H35
b) C18H40
c) C18H36
d) None of the mentioned
Answer: d
Clarification: Paraffin wax in a semi solid stage is represented by C18H38.
7. A thermoplastic material has a linear polymer chain while a thermosetting plastic has a crosslinked polymer chain.
a) True
b) False
Answer: a
Clarification: Given statement is true thats why thermoplastic can be remoulded while thermosettings can’t be.
8. Which of the following is a thermosetting polymer?
a) PVC
b) PTFE
c) Nylon
d) Polyesters
Answer: d
Clarification: a), b) and c) consist of linear structures while polyester consists of cross linked and hence is a thermosetting polymer.
9. Teflon has very high coefficient of resistance.
a) True
b) False
Answer: b
Clarification: Teflon is very smooth and has coefficient of friction as low as 0.04.
10. Viscoelastic materials at low temperatures show no change in its strain with change in stress.
a) True
b) False
Answer: b
Clarification: Viscoelastic materials follow Hooke’s law at intermediate temperatures.
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