Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Ethenic Polymers
1 - Question
What is an ethenic polymer?
a) Polymers made from monomers having bifunctional group
b) Polymers made from multiple monomers
c) Polymers made from monomers having trifunctional group
d) Simple polymers
Explanation: Polymers made from monomers having the bifunctional group are ethenic because ethylene has the simplest all hydrogen atom structure and others are substitutions of other groups at w, x, y and z positions.
2 - Question
How is polyethylene manufactured?
a) Low pressure metal oxide process
b) Low pressure Ziegler process
c) High pressure metal oxide process
d) High pressure Ziegler process
Explanation: High purity polyethylene is manufactured by desulphuring and removing the light ends followed buy removal of excess oxygen combined with titanium tetrachloride to produce a saturated paraffin.
3 - Question
How is the residual catalyst removed during the manufacture of polyethylene?
a) By adding water
b) By adding sulfuric acid
c) By adding nitric acid
d) By adding phosphoric acid
Explanation: The residual catalyst is removed from the polyethylene by adding water. Water is added because the residual catalyst is highly flammable in dry conditions. Adding acid would increase the flammability.
4 - Question
What is the softening point range of PVC?
a) 150-200 °C
b) 20-100 °C
c) 80-140 °C
d) 140-200 °C
Explanation: PVC has a softening point ranging from 80 °C-140 °C increasing with the degree of after chlorination. After 140°C it decomposes liberating HCl.
5 - Question
Which polymerization technique is used for the manufacture of industrial PVC?
a) Solution polymerization
b) Bulk polymerization
c) Emulsion polymerization
d) Addition polymerization
Explanation: Emulsion polymerization technique is done in order to produce high purity polymer. In Emulsion polymerization, a typical formulation is 100 parts of water, 100 parts of vinyl monomer, 1 part of persulfate catalyst and 1.5 parts of detergent emulsifier.
6 - Question
Which among the following is not an ABS resin?
c) Styrene copolymer
Explanation: Acrylonitrile, butadiene and styrene copolymer are examples of ABS resins. They are classified as engineering plastic used in automobile components, refrigerator parts etc.