Insulating Materials - Engineering Materials & Metallurgy Questions and Answers

This set of Engineering Materials & Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on “Insulating Materials – 1”.

1. Which of the following is an application of asbestos?
a) Fireproofing
b) Conduction of heat
c) X-ray tubes
d) Optical glass
View Answer

Answer: a
Explanation: Asbestos is a common insulation material used for fireproofing and in buildings or industrial applications. Natural asbestos is found in rocks and has a density equal to that of the rock.

2. What kind of mineral is Chrysotile?
a) Glass
b) Asbestos
c) Diamond
d) Cork
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Answer: b
Explanation: Chrysotile is the most important mineral type of asbestos, accounting for close to 93% of the asbestos production. It is a hydrated magnesium silicate formed from a group of serpentine mineral. They have good fire resistance, are flexible, and tough.

3. Which of the following is a characteristic of asbestos minerals?
a) Poor strength
b) Heat resistance
c) Poor bonding
d) Reacts with acids
View Answer

Answer: b
Explanation: Asbestos minerals are highly preferred in their fibrous form. They possess high strength, surface area, and good bonding characteristics. They are also resistant to heat, acids, and moisture.

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4. What is the specific heat of Chrysotile?
a) 0.033
b) 0.266
c) 0.469
d) 0.788
View Answer

Answer: b
Explanation: Chrysotile is the most preferred mineral of asbestos. However, it has poor resistance to acids and alkalies. Its specific heat is 0.266 BTU/lb/F.

5. Which is of following is not an asbestos mineral?
a) Actinolite
b) Amosite
c) Crocidolite
d) Pyroceram
View Answer

Answer: d
Explanation: Asbestos is a term used to describe a list of minerals. These fibrous minerals are chrysotile, amosite, crocidolite, actinolite, tremolite, and anthophyllite. Pyroceram, on the other hand, is a type of glass.

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6. What makes up the primary composition of glass?
a) MgO
b) K₂O
c) SiO₂
d) BaO
View Answer

Answer: c
Explanation: Glass is primarily composed of SiO₂ with over 70% in bulb and bottle glass, and over 80% in Pyrex. K₂O Is generally found having a composition of less than or around 1%. MgO and BaO aren’t found in Pyrex but are available in bottle and bulb glass having less than 4%.

7. Pyrex glass is otherwise known as _________ glass.
a) soda lime
b) fused silica
c) borosilicate
d) pyroceram
View Answer

Answer: c
Explanation: Pyrex is a glass mainly used for manufacturing laboratory equipment. It is more commonly known by the name of borosilicate glass. This glass has a low expansion coefficient and a good spalling resistance.

8. Pyroceram glass softens above ______
a) 1000^oC
b) 2000^oC
c) 4500^oC
d) 5500^oC
View Answer

Answer: b
Explanation: Pyroceram is a common glass type of crystalline glass. This crystalline glass softens above 2000oC and has a low specific heat of about 0.1.

9. Cork is composed of _____ air.
a) <1%
b) <10%
c) 20%
d) >50%
View Answer

Answer: d
Explanation: Cork is an insulating material made from the outer bark of oak trees. It is composed of at least 50% air, which makes it one of the lightest solids. It has a specific gravity of around 0.25.

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