Engineering Questions with Answers - Multiple Choice Questions
Chemical Process Technology MCQ’s – Natural Products – Starch Derivatives
1 - Question
Dextrin is a water soluble carbohydrate gum.
Explanation: The statement is true as dextrin is formed by acid hydrolysis of starch. It is used in adhesives and gums being a carbohydrate gum. The modern method of producing dextrin is Fluidized hydrolysis.
2 - Question
Dextrin production reaction can be stopped by adding _________
a) Hydrochloric acid
Explanation: Ammonia addition or rapid cooling using water in plate coil exchanger stops the de polymerization reaction which is responsible for dextrin production.
3 - Question
The oxidized form of starch is __________
b) Dialdehyde starch
c) Starch phosphate
d) Starch sulfate
Explanation: Dialdehyde starch is the oxidized form of starch used as wet strength additive in paper industry. It is formed by the reaction of starch with per iodic acid.
4 - Question
Which of the following statements are wrong?
a) Dextrin is used in adhesives
b) Starch phosphate is water soluble
c) Dialdehyde starch is oxidized form of starch
d) Regeneration of per iodic acid to iodic acid is high cost process
Explanation: Dextrin being carbohydrate gum is used in adhesives and gums. Starch phosphate is water soluble and has good thickening power. Dialdehyde starch is formed by oxidation of starch with per iodic acid. Regeneration of per iodic acid is a low cost process which is key to the oxidation reaction.
5 - Question
The electrolysis unit uses frames made up of ________
a) Poly vinyl chloride
b) Poly ethylene chloride
c) Poly vinyl acetate
d) Poly propylene
Explanation: Poly vinyl acetate frames in large number constructed in filter press style are used in electrolysis unit and all piping is coated with poly vinyl acetate to avoid corrosion.