Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Industrial Processes-I
1 - Question
Which process is hardening of vegetable or marine oils?
a) Dehydrogenation
b) Oxidation
c) Hydrogenation
d) None of the mentioned
View Answer
Explanation: The hydrogenation or hardening of vegetable or marine oils is an industrial applications of hydrogenation process.
2 - Question
What is the purposes of the hydrogenation of vegetable?
a) Produce hard fats
b) Removing impurities
c) Greater consistency
d) All of the mentioned
View Answer
Explanation: The purposes of the hydrogenation of vegetable and animal oils are (1) to produce a hard fat or one of greater consistency than the original liquid oil and (2) to remove certain impurities that are not removable by any other means, thus rendering the oil useful for purposes for which it could not otherwise be adapted.
3 - Question
During processing of edible oils what should be the temperature range?
a) High
b) Low
c) Moderate
d) None of the mentioned
View Answer
Explanation: The processing of edible oils is usually carried out with considerable care and at lower temperatures in order to minimize undesirable side reactions.
4 - Question
When the oils are completely hydrogenated what do we get?
a) Solid
b) Liquid
c) Vapour
d) All of the mentioned
View Answer
Explanation: When these oils are completely hydrogenated we get solids as result.
5 - Question
When the oils are partially hydrogenated, we get solid as result.
a) True
b) False
View Answer
Explanation: When these oils are completely hydrogenated, solids result; when the oils are partially hydrogenated. Fats of various consistencies or melting points are obtained.
6 - Question
The degree of hydrogenation is determined by what?
a) Melting point
b) Iodine-absorption number
c) Refractive index
d) All of the mentioned
View Answer
Explanation: The degree of hydrogenation is readily determined for any given oil by the melting point, iodine-absorption number, or refractive index.
7 - Question
Nickel is by far the most commonly used catalyst in oil hardening.
a) True
b) False
View Answer
Explanation: Nickel is by far the most commonly used catalyst in oil hardening. The catalyst problem consists of three phases: (1) preparation of a suitable catalyst, (2) maintenance of its activity as long as possible, and (3) recovery and reactivation of the spent catalyst.
8 - Question
Carbon monoxide may be hydrogenated to produce what?
a) Hydrocarbon
b) Alcohols
c) Both hydrocarbon and alcohols
d) None of the mentioned
View Answer
Explanation: Carbon monoxide may be hydrogenated to produce either alcohols or hydrocarbons, depending on the catalysts used and the reaction conditions. Temperatures ranging from 100–400°C and pressures as high as 1,000 atm.
9 - Question
The synthesis of methanol from carbon monoxide and hydrogen is what type of reaction?
a) Irreversible
b) Reversible
c) Both of the mentioned
d) None of the mentioned
View Answer
Explanation: The Methanol Synthesis: The synthesis of methanol from carbon monoxide and hydrogen is a reversible reaction.
10 - Question
What happens to equilibrium constant in methanol synthesis as temperature decreases?
a) Increases
b) Remains same
c) Decreases
d) None of the mentioned
View Answer
Explanation: During methanol synthesis, the equilibrium constant is small and that it decreases rapidly with temperature.
11 - Question
Fill in the blank: Carbon monoxide is an active _____ for nickel catalysts.
a) Promoter
b) Reactant
c) Poison
d) All of the mentioned
View Answer
Explanation: Carbon monoxide is an active poison for nickel catalysts used in hydrogenation and for this reason must be removed
12 - Question
What should be the operating temperature to produce higher alcohol?
a) Higher
b) Lower
c) Moderate
d) None of the mentioned
View Answer
Explanation: Higher alcohols are produced when operating temperatures are slightly higher (350-475°C) than those used in the methanol synthesis and with methanol catalysts containing alkalies or else iron-base catalysts containing alkalies.
13 - Question
The higher alcohol mixture contains which of the following primary alcohols?
a) N-propanol
b) Isobutanol
c) 2-methyl-1-butanol
d) All of the mentioned
View Answer
Explanation: The higher alcohol mixture has been found to contain the following primary alcohols: n-propanol, isobutanol, 2-methyl-1-butanol, 2-methyl- pentanol, 2,4-dimethyl-1-pentanol, 4-methyl-1-hexanol; and the following secondary alcohols: isopropanol, 3-methyl-2-butanol, and 2,4-dimethyl- 3-pentanol. In addition,. There are definite indications of 2,4-dimethyl- 1-hexanol, 4 or 5-methyl-I-heptanol, 3-pentanol, 2-pentanol, and 2-methyl- 3-pentanol.