Unit Operations multiple choice questions
Unit Operations
1. What is the removal of fine particle sand dissolved solids called?
a) Filtration
b) Sedimentation
c) Deoxidation
d) Disinfection
Answer: Filtration
2. Solids concentration will be ________ in water than wastewater.
a) More
b) Less
c) Equal to
d) Similar
Answer: Less
3. _________ is simply detaining water for a sufficient time.
a) Coagulation
b) Flocculation
c) Sedimentation
d) Filtration
Answer: Sedimentation
4. Unit operations are the ______ operations to remove the impurities.
a) Physical
b) Chemical
c) Biological
d) Biochemical
Answer: Physical
5. Refrigeration is a mass transfer process.
a) True
b) False
Answer: False
6. What did the structures use to prevent floating matter that enters into pumps and pumping systems?
a) Aeration units
b) Screens
c) Grit chamber
d) Bioreactor
Answer: Screens
7. Separation is a unit operation.
a) True
b) False
Answer: True
8. How are colour and odour removed?
a) Adsorption
b) Sedimentation
c) Filtration
d) Coagulation
Answer: Adsorption
9. While designing a mechanical screen, the clear space between the bars would be in what range?
a) 15-75mm
b) 25-50mm
c) 20-40mm
d) >75mm
Answer: 15-75mm
10. What is the size of the openings for a fine screen?
a) 0.1 mm
b) 0.8-1mm
c) 0.2-0.6mm
d) 1-3mm
Answer: 0.2-0.6mm
11. What is the size of openings of a coarse screen?
a) 6mm-150mm
b) 150-200mm
c) >200mm
d) < 6mm
Answer: 6mm-150mm
12. What is the maximum approach velocity to be considered for a mechanical screen while designing it?
a) 0.3-0.5m/s
b) 0.6-1m/s
c) 1-1.5m/s
d) 2 m/s
Answer: 0.6-1m/s
13. What is the detention time considered while designing a Grit chamber?
a) 20-40 sec
b) 10-20 sec
c) 90-120 sec
d) 45-90 sec
Answer: 45-90 sec
14. What is the percentage of TSS removed by a rotary drum fine screen?
a) 50%
b) 60%
c) 65-75%
d) 25-45%
Answer: 25-45%
15. In order to prevent clogging what should be provided prior to tube settlers?
a) Clarifiers
b) Coarse screen
c) Fine screen
d) Grit chamber
Answer: Fine screen
16. Which type of mixer is used when the flow needs to be changed often?
a) Paddle mixer
b) Static mixer
c) Mechanical mixer
d) Mechanical aerator
Answer: Static mixer
17. Which of these is not a type of grit chamber
a) Horizontal flow
b) Vortex
c) Vertical flow
d) Aerated
Answer: Vertical flow
18. Which type of mixers are used to mix coagulants like alum, ferric ammonium sulphate and coagulant aids such as polyelectrolyte and lime?
a) Static mixers
b) Mechanical mixers
c) Mechanical aerators
d) Paddle mixers
Answer: Paddle mixers
19. The law of ________ states that mass can neither be created nor destroyed.
a) Radiation
b) Wastewater
c) Conversion of mass
d) Water
Answer: Conversion of mass
a) Filtration
b) Sedimentation
c) Deoxidation
d) Disinfection
Answer: Filtration
2. Solids concentration will be ________ in water than wastewater.
a) More
b) Less
c) Equal to
d) Similar
Answer: Less
3. _________ is simply detaining water for a sufficient time.
a) Coagulation
b) Flocculation
c) Sedimentation
d) Filtration
Answer: Sedimentation
4. Unit operations are the ______ operations to remove the impurities.
a) Physical
b) Chemical
c) Biological
d) Biochemical
Answer: Physical
5. Refrigeration is a mass transfer process.
a) True
b) False
Answer: False
6. What did the structures use to prevent floating matter that enters into pumps and pumping systems?
a) Aeration units
b) Screens
c) Grit chamber
d) Bioreactor
Answer: Screens
7. Separation is a unit operation.
a) True
b) False
Answer: True
8. How are colour and odour removed?
a) Adsorption
b) Sedimentation
c) Filtration
d) Coagulation
Answer: Adsorption
9. While designing a mechanical screen, the clear space between the bars would be in what range?
a) 15-75mm
b) 25-50mm
c) 20-40mm
d) >75mm
Answer: 15-75mm
10. What is the size of the openings for a fine screen?
a) 0.1 mm
b) 0.8-1mm
c) 0.2-0.6mm
d) 1-3mm
Answer: 0.2-0.6mm
11. What is the size of openings of a coarse screen?
a) 6mm-150mm
b) 150-200mm
c) >200mm
d) < 6mm
Answer: 6mm-150mm
12. What is the maximum approach velocity to be considered for a mechanical screen while designing it?
a) 0.3-0.5m/s
b) 0.6-1m/s
c) 1-1.5m/s
d) 2 m/s
Answer: 0.6-1m/s
13. What is the detention time considered while designing a Grit chamber?
a) 20-40 sec
b) 10-20 sec
c) 90-120 sec
d) 45-90 sec
Answer: 45-90 sec
14. What is the percentage of TSS removed by a rotary drum fine screen?
a) 50%
b) 60%
c) 65-75%
d) 25-45%
Answer: 25-45%
15. In order to prevent clogging what should be provided prior to tube settlers?
a) Clarifiers
b) Coarse screen
c) Fine screen
d) Grit chamber
Answer: Fine screen
16. Which type of mixer is used when the flow needs to be changed often?
a) Paddle mixer
b) Static mixer
c) Mechanical mixer
d) Mechanical aerator
Answer: Static mixer
17. Which of these is not a type of grit chamber
a) Horizontal flow
b) Vortex
c) Vertical flow
d) Aerated
Answer: Vertical flow
18. Which type of mixers are used to mix coagulants like alum, ferric ammonium sulphate and coagulant aids such as polyelectrolyte and lime?
a) Static mixers
b) Mechanical mixers
c) Mechanical aerators
d) Paddle mixers
Answer: Paddle mixers
19. The law of ________ states that mass can neither be created nor destroyed.
a) Radiation
b) Wastewater
c) Conversion of mass
d) Water
Answer: Conversion of mass
20. In which form of solute stabilization, hydrogen sulfide in the effluent is oxidized into sulfate?
a) Chlorination
b) Liming
c) Re-carbonation
d) Super-chlorination
Answer: Chlorination
21. How many types of aerators are commonly used in the treatment of wastewater?
a) 2
b) 3
c) 4
d) 5
Answer: 4
22. Dealkalization results in removal of all the ions from the wastewater.
a) True
b) False
Answer: False
23. By which process, odor producing substances are oxidized?
a) Chlorination
b) Liming
c) Re-carbonation
d) Super-chlorination
Answer: Super-chlorination
24. Solids are removed from the wastewater by which of the following unit operation?
a) Inter facial contact
b) Solid stabilization
c) Ion transfer
d) Solids transfer
Answer: Solids transfer
25. Which of the following process is used to remove the colloidal particles from the effluent?
a) Chemical precipitation
b) Chemical coagulation
c) Ion exchange
d) Adsorption
Answer: Chemical coagulation
26. In which unit operation, gases are released or absorbed in the effluent?
a) Gas transfer
b) Ion transfer
c) Solute stabilization
d) Solids Transfer
Answer: Gas transfer
27. Flocculation of iron from water by the addition of lime is an example of which of the following process?
a) Chemical precipitation
b) Chemical coagulation
c) Ion exchange
d) Adsorption
Answer: Chemical precipitation
28. In which unit operation objectionable solutes are converted into unobjectionable forms without removal?
a) Gas transfer
b) Ion transfer
c) Solute stabilization
d) Solids Transfer
Answer: Solute stabilization
29. Which form of solute stabilization occurs when effluent passes through limestone?
a) Chlorination
b) Liming
c) Re-carbonation
d) Super-chlorination
Answer: Liming
30. Organic contaminants are removed from the wastewater by ____________
a) Water softening
b) Demineralization
c) Absorption
d) Adsorption
Answer: Adsorption
31. In which process, excess lime is converted into bicarbonate?
a) Chlorination
b) Liming
c) Re-carbonation
d) Super-chlorination
Answer: Re-carbonation
Unit Operations
32. 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
Answer: Pressurized Spheres
33. Which of the mentioned is a unit operation?
a) Polymerization
b) Steam reforming
c) Catalytic cracking
d) Distillation
Answer: Distillation
34. Which of the following operation uses gravity?
a) Decantation
b) Sedimentation
c) Settling
d) All the mentioned
Answer: All the mentioned
35. Into which of the mentioned options can be evaporation be considered?
a) Boiling
b) Removal of water
c) Process of concentrating
d) Drying
Answer: Process of concentrating
36. 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
Answer: Solid and liquid particles from gases
37. Unit operations involve change in which of the mentioned?
a) Chemical Changes
b) Physical Changes
c) Chemical and physical Changes
d) No change
Answer: Physical Changes
38. Extraction comes under which of the mentioned?
a) Unit operation
b) Unit process
c) None of the mentioned
d) Unit process and Unit Operation
Answer: Unit operation
39. Which of the mentioned come under size reduction equipment?
a) Ball mill
b) Roll crusher
c) Jaw Crusher
d) All the mentioned
Answer: All the mentioned
40. 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
Answer: Unit operation
SPECIALITY CHEMICAL
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Industrial Waste Water Treatment Plant Design and Service
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