Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Preparations
1 - Question
Amyl alcohols are prepared from what?
a) Chloropentanes
b) Chlorohexane
c) Chloroethane
d) None of the mentioned
View Answer
Explanation: Preparation of Amyl Alcohols from Chloropentanes.
2 - Question
Chlorination of pentane gives which type of chloride in preparation of amyl chloride?
a) Primary
b) Secondary
c) Tertiary
d) All of the mentioned
View Answer
Explanation: Two pentanes (normal and iso) serve as starting products for chlorination, and these give rise to primary, secondary, and tertiary chlorides.
3 - Question
The cracking of what produces olefin gases?
a) Fats
b) Petroleum
c) Amide
d) None of the mentioned
View Answer
Explanation: The cracking of petroleum, especially vapour-phase cracking, produces tremendous volumes of olefin gases, which are now extensively used as raw materials for alcohol production.
4 - Question
How is complex olefin produced?
a) High pressure
b) High temperature
c) Low temperature
d) None of the mentioned
View Answer
Explanation: The more complex the olefin, the lower the temperature and pressure at which reaction will take place.
5 - Question
How to increase the yield of alcohol?
a) High pressures
b) Dilute acid
c) High temperature
d) All of the mentioned
View Answer
Explanation: Some processes use dilute acid under high pressures, an increased yield of alcohol being obtained with a corresponding decreased yield of ether.
6 - Question
What is produced in ‘The Shell Process’?
a) Methanol
b) Ethanol
c) Propanol
d) All of the mentioned
View Answer
Explanation: The Shell Process.2 The production of ethanol by the direct addition of water to ethylene is being carried out successfully on a commercial scale.
7 - Question
What catalyst is used in Shell process?
a) Nickel
b) Xanthium
c) Aluminium
d) Celite
View Answer
Explanation: In the Shell process a phosphoric acid-on Celite catalyst is used in the reaction.
8 - Question
What condition is/are favourable for hydration of ethylene?
a) High pressure
b) Low temperature
c) High steam: ethylene ratios
d) All of the mentioned
View Answer
Explanation: The direct hydration of ethylene is an equilibrium reaction which is favoured by low temperatures, high pressures, and high steam: ethylene ratios.
9 - Question
What happens to the catalytic activity as temperature increases?
a) Increases
b) Decreases
c) No change
d) None of the mentioned
View Answer
Explanation: The catalytic activity of the phosphoric acid catalyst increases with increasing temperature, decreases with increasing pressure because of lower concentration, and decreases with high steam: ethylene ratios at high pressures because of moisture absorption.
10 - Question
The equilibrium concentration of ethyl alcohol decreases with an increase in temperature.
a) True
b) False
View Answer
Explanation: The equilibrium concentration of ethyl alcohol decreases rapidly with an increase in temperature while the activity of the catalyst increases.
11 - Question
The ethylene purity is a function of what?
a) Feed purity
b) Vent rate
c) Both feed purity and vent rate
d) None of the mentioned
View Answer
Explanation: The ethylene purity in the recycle is a function of feed purity and vent rate.
12 - Question
What is prepared when propylene is chlorinated?
a) Alkyl chloride
b) Allyl chloride
c) Aromatic chloride
d) None of the mentioned
View Answer
Explanation: When propylene is chlorinated at temperatures above 200°C, yields of 85-90 per cent of ally I chloride are obtained.