This set of Engineering Chemistry Interview Questions and Answers for freshers focuses on “Fibers – 2”.
1. Which of the following is not an application of nylon-6, 6?
a) Durable hair combs
b) Adhesives
c) Tyre cords
d) Medicine and pharmacy
View Answer
Explanation: Durable hair combs, tyre cords, medicine and pharmacy are some of the applications of nylon-6, 6.
2. Nylon-6, 6 have application in medicine and pharmacy because of ____________
a) Elasticity
b) Toughness
c) Good hydrocarbon resistance
d) Sterilisability
View Answer
Explanation: Nylon-6, 6 have applications in medicine and pharmacy because of sterilisability. It is also used as an engineering material in bearings and gears due to its good abrasion resistance and self-lubricating properties.
3. The other name for dacron is ____________
a) Polyethylene terephthalate
b) Polyacrylonitrile
c) Polyamidenitrile
d) Polyethylene caprolactum
View Answer
Explanation: The other name for dacron is polyethylene terephthalate. It is the most common thermoplastic polymer resin of the polyester family and is used in fibers for clothing, containers for liquids and foods.
4. PET is prepared by heating dimethyl terephthalate and ethylene glycol in ____________
a) Acidic medium
b) Basic medium
c) Neutral medium
d) Water
View Answer
Explanation: PET is prepared by heating dimethyl terephthalate and ethylene glycol in a basic medium at moderate pressure (2.7–5.5 bar) and high temperature (220–260 °C).
5. Terephthalic acid is converted into its dimethyl ester by treating it with ____________
a) Methyl chloride
b) Hydroxylamine
c) Methyl alcohol
d) Ethylene glycol
View Answer
Explanation: Terephthalic acid is converted into its dimethyl ester by treating it with methyl alcohol. At high temperature, TPA crystals constantly dissolve and reform which increases the release of 4-formylbenzoic acid in solution where oxidation can be completed.
6. Blends of terylene fibers with wool have better crease and wrinkle resistance, they are more durable, higher strength, do not shrink and are not attacked by moths.
a) True
b) False
View Answer
Explanation: Blends of terylene fibers with wool have better crease and wrinkle resistance, they are more durable, higher strength, do not shrink and are not attacked by moths. Terylene polyester staple fiber is being used in staple-fibre form in blends with both natural and other synthetic fibers.
7. Which of the following is not an application of dacron?
a) Magnetic recording tapes
b) Wide-necked jars for coffee
c) Car heater
d) Window shades
View Answer
Explanation: Magnetic recording tapes, wide-necked jars for coffee, car heater are some of the applications of dacron.
8. Acrylonitrile is ____________
a) Vinyl chloride
b) Methyl alcohol
c) Methyl chloride
d) Vinyl cyanide
View Answer
Explanation: Acrylonitrile is a vinyl cyanide. It is an organic compound with the formula CH2CHCN and is colorless volatile liquid, although commercial samples can be yellow due to impurities.
9. Select the incorrect statement from the following option.
a) Orlon is the trade name of polyacrylonitrile
b) Orlon fibers are quick drying and resistant to water
c) Orlon fibers are less resistant to acid, gases than nylon
d) Orlon fibers are used for manufacturing window shades
View Answer
Explanation: Orlon fibers are more resistant to acid, gases than nylon. All the other options are correct.
10. Polyacrylonitrile can be dissolved in its monomer so it can be shaped by bulk casting.
a) True
b) False
View Answer
Explanation: Polyacrylonitrile does not dissolved in its monomer so it cannot be shaped by bulk casting.
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