This set of Chemical Technology Multiple Choice Questions & Answers (MCQs) focuses on “Unit Operations”.
1. Which of the mentioned is a unit operation?
a) Polymerization
b) Steam reforming
c) Catalytic cracking
d) Distillation
View Answer
Explanation: Distillation is a process of separation of miscible liquids on basis of their difference in vapor pressures, which involves no chemical reactions whereas the rest involve chemical changes.
2. Unit operations involve change in which of the mentioned?
a) Chemical Changes
b) Physical Changes
c) Chemical and physical Changes
d) No change
View Answer
Explanation: Any operation that brings physical changes of the component is a unit operation.
3. Drying can be characterized as which of the mentioned?
a) Unit process
b) Unit operation
c) Unit process and Unit operation
d) None of the mentioned
View Answer
Explanation: Drying involves removal of moisture which doesn’t undergo any chemical changes.
4. Extraction comes under which of the mentioned?
a) Unit operation
b) Unit process
c) None of the mentioned
d) Unit process and Unit Operation
View Answer
Explanation: Removal of one component from a solution using another solvent is liquid-liquid extraction, Solvent should be selected in such a way that its not reactive. Therefore, no chemical reaction occurs.
5. Which of the following operation uses gravity?
a) Decantation
b) Sedimentation
c) Settling
d) All the mentioned
View Answer
Explanation: All the given operations occur due to the size of the particles based on their weight where the principle of gravity is involved.
6. Cyclone separator is used to separate which of the mentioned?
a) Solids particle from liquid
b) Liquids particles from liquid
c) Solid and liquid particles from gases
d) Solids from gases only
View Answer
Explanation: Cyclone separator is used to separate solids particles and liquid droplets from the gas flow to purify it/prevent air pollution etc.
7. Which of the mentioned equipment is used to store volatile components to prevent vapor losses.
a) Pressurized Spheres
b) Tanks
c) Gas holders
d) Underground caverns
View Answer
Explanation: Volatile components exert vapor pressure and tend to vaporize with ease, to prevent this we need to exert pressure on them. Therefore, pressurized spheres are used.
8. Which of the mentioned come under size reduction equipment?
a) Ball mill
b) Roll crusher
c) Jaw Crusher
d) All the mentioned
View Answer
Explanation: All the equipment mentioned uses crushing to reduces the size.
9. Into which of the mentioned options can be evaporation be considered?
a) Boiling
b) Removal of water
c) Process of concentrating
d) Drying
View Answer
Explanation: Evaporation occurs with components like acetone too, so ‘Process of concentrating’ is eliminated. Boiling needs high temperatures but evaporation occurs at ordinary temperature too. Drying is removal of moisture. Therefore, the best option is ‘Process of concentrating’.
Sanfoundry Global Education & Learning Series – Chemical Technology.
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