Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Esterification Practice
1 - Question
The plant for making esters from organic acids and alcohols is divided into how many types?
a) Two
b) Three
c) Four
d) Five
View Answer
Explanation: A plant for making esters from organic acids and alcohols on a large scale may be of three general types.
2 - Question
In esterification plant it is necessary to employ which catalyst?
a) Nitric acid
b) Hydrochloric acid
c) Sulphuric acid
d) All of the mentioned
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Explanation: In every case of esterification plant, it is now customary to employ a catalyst, which is usually sulfuric acid, in admixture with the alcohol and acid that are to react.
3 - Question
Which type of apparatus is used for commercial-scale esterification units?
a) Alloy
b) Stainless steel
c) Hydrogenated steel
d) None of the mentioned
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Explanation: Apparatus of special grades of stainless steel is generally used for commercial-scale esterification units.
4 - Question
As temperatures and concentrations of corrodents are increased, which type of stainless steels is/are used?
a) Ferritic chromium alloys
b) Chromium-nickel alloys
c) Both the alloys
d) None of the mentioned
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Explanation: As temperatures and concentrations of corrodents are increased, the choice of stainless steels is narrowed to the ferritic chromium alloys and the austenitic chromium-nickel alloys.
5 - Question
Which process is used for manufacturing ethyl acetate?
a) Batch process
b) Continuous process
c) Semi batch process
d) All of the mentioned
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Explanation: All of these process can be used for the manufacturing ethyl acetate.
6 - Question
What does refining of the ester include?
a) Neutralising
b) Water washing
c) Agitation
d) All of the mentioned
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Explanation: The refining of the ester distillate comprises neutralizing with sodium carbonate or lime under agitation, followed by a water washing, which removes the excess of alcohol.
7 - Question
The presence of considerable amount of water affects what?
a) Apparatus
b) Temperature
c) Both apparatus and temperature
d) None of the mentioned
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Explanation: The presence of any considerable amount of water decreases the capacity of the apparatus and lengthens the distillation time.
8 - Question
Polyethylene terephthalate is used in the manufacture of Dacron polyester fibre.
a) True
b) False
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Explanation: Polyethylene terephthalate is used in the manufacture of Dacron polyester fibre, Mylar polyester film, and Cronar photographic film base.
9 - Question
Polyethylene terephthalate is prepared by a transesterification reaction.
a) True
b) False
View Answer
Explanation: Polyethylene terephthalate is prepared by a transesterification reaction between dimethyl terephthalate and the dihydric alcohol, ethylene glycol.
10 - Question
Dimethyl terephthalate is obtained by esterification of what?
a) Benzene
b) Ethanol
c) Terephthalic acid
d) None of the mentioned
View Answer
Explanation: Dimethyl terephthalate is obtained by the esterification of terephthalic acid by methanol.
11 - Question
The duration of the polymerization depends on what?
a) Temperature
b) Catalyst
c) Size of batch
d) All of the mentioned
View Answer
Explanation: The duration of the polymerization depends on the catalyst concentration, reaction temperature, size of the batch of polymer being produced, and the amount of surface area generated in the polymerization autoclave.