Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Polymerization – Fibres
1 - Question
What are synthetic polymeric fibres?
a) Multifunctional monomers forming three or more active covalent bonds
b) Linear chains joined one to another at various positions
c) Linear molecules formed by extrusion
d) Polymers with side branches
Explanation: Synthetic polymeric fibres are linear molecules formed by extrusion or spinning into small diameter. Network polymers are multifunctional monomers forming three or more active covalent bonds.
2 - Question
How is synthetic polymeric fibres made?
Explanation: Synthetics are prepared from molten linear polymers or a solution of polymers by extrusion through a die containing 20 to 15000 small holes, solidifying and collecting a group of threads as a filament.
3 - Question
Which sector of textile industry is called worsted industry?
Explanation: Wool sector of the textile industry is better known as worsted industry, as its main product is suiting-all wool (AW), polyester wool (PW) and polyester viscose.
4 - Question
Which among the following is known as poor man’s silk?
Explanation: Viscose rayon is more commonly known as poor mans silk due to its vast material application and is cost effective.
5 - Question
Viscose is a weak fibre.
Explanation: Viscose suffers from major deficiencies, therefore it’s a weak fibre especially when its wet. It generates toxic effluents during its manufacture.
6 - Question
What is the main raw material of Viscose rayon?
c) Wood pulp
Explanation: The main raw material for the manufacture of viscose rayon includes wood pulp, other strengthening additives. Its production produces toxic effluents.
7 - Question
Which is the most commonly used dying fibre?
Explanation: Nylon is most commonly used dying fibre because of its excellent dying properties and its cost effective.
8 - Question
How is cellulose manufactured in industry?
a) Xanthate process
b) Contact process
c) Monte carteni process
d) Natural process
Explanation: Cellulose is produced by viscose or xanthate process, with the cuprammonium produced contributing only minor production.
9 - Question
What are the series of steps involved in viscose process?
a) Alkali conversion-Solubilization-Acid regeneration
b) Acid regeneration-Solubilization-Alkali conversion
c) Solubilization-Acid Regeneration-Alkali conversion
d) Acid Regeneration-Alkali conversion-Solubilization
Explanation: Initially the cellulose reacts with NaOH to form alkali cellulose which undergoes solubilization by CS2 and then gets converted to cellulose by the addition of acid.
10 - Question
6,6 Nylon is manufactured from ____________
c) adipic acid
d) sulfuric acid
Explanation: 6,6 Nylon is manufactured from adipic acid. This adipic acid then reacts with hexamethylene diamine to form polyhexamethylene adipamide or 6,6 nylon.
11 - Question
Which among the following is the major component of acrylic fibres?
Explanation: Acrylics constitute one of the four major classes of synthetic fibres. Polyacrylonitrile is the major component of acrylic fibres. A comonomer is generally incorporated to improve such fibre properties.