Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Polycondensation
1 - Question
Which polymer is considered cheap effective and has excellent physical and electrical properties?
a) Phenolics
b) Epoxy resin
c) Polystyrene
d) PVC
View Answer
Explanation: Phenolics are low cost polymers with excellent physical and electrical properties and fast curing characteristics. Pigments are added to enhance its colour.
2 - Question
How can we control the resin characteristics?
a) Basic solution catalyst
b) Acid solution catalyst
c) Solid catalyst
d) Adding acid
View Answer
Explanation: General resin characteristics can be controlled by adding an acid solution catalyst with excess phenol which produces linear soluble thermoplastics.
3 - Question
What is epoxidation?
a) Addition of nitrogen atom across a C=C
b) Addition of sulphur atom across a C=C
c) Addition of oxygen atom across a C=C
d) Addition of oxygen atom across a C-C
View Answer
Explanation: Epoxidation is the addition of oxygen across a C=C to give The oxygen transfer agent can be peracids such as peracetic acid, hydrogen peroxide, or chlorohydrin followed by HCl removal.
4 - Question
How is epichlorohydrin condensed with other hydroxyl groups?
a) Resorcinol
b) Alcohol
c) Phenolphthalein
d) PVC
View Answer
Explanation: Epichlorohydrin’s are condensed with other hydroxyl groups in compounds such as resorcinol, hydroquinone, ethylene glycol and glycerol.
5 - Question
Epichlorohydrin reins exhibit extreme versatility.
a) True
b) False
View Answer
Explanation: Epoxy reins exhibit extreme volatility because of possible combinations of properties such as chemical stability, reactivity, excellent adhesion, good abrasion and electrical properties.
6 - Question
Epoxy polymers are manufactured by batch processing technique.
a) True
b) False
View Answer
Explanation: Epoxy polymers are manufactured largely by batch processing because of low tonnage, Multiple formulation marketing.
7 - Question
What is the main raw material in the manufacture of polyurethane?
a) Polyol
b) Glycol
c) Glycerol
d) Glycerine
View Answer
Explanation: Polyols are used as main raw material in the manufacture of polyurethane foams along with methyl di-phenyl diisocyanate and toluene diisocyanate.