Deck 8: Demineralized Water, Ion-Exchange, and Ozonation Processes

Question 1

Which of the following statement is incorrect about the demineralised water?

A)It is as pure as distilled water
B)It is very good for use in high pressure boilers
C)It is fit for domestic use
D)It can be made either by distillation or by using cation and anion exchangers

Answer 1

It is fit for domestic use

Question 2

The exhausted cation exchange column is regenerated by passing a solution of ____________

A)Dil. HCl
B)Dil. NaCl
C)Conc. HCl
D)Conc. NaCl

Answer 2

Dil. HCl

Question 3

The exhausted anion exchange column is regenerated by passing a solution of ____________

A)Dil. KOH
B)Conc. KOH
C)Conc. NaOH
D)Dil. NaOH

Answer 3

Dil. NaOH

Question 4

In ion-exchange process, the capital cost is _________ and the operational expenses are ______________

A)Low, high
B)High, low
C)High, high
D)Low, low

Question 5

The residual hardness in ion-exchange process is ____________

A)0-2 ppm
B)5-10 ppm
C)10-15 ppm
D)20-30 ppm

Question 6

How many oxygen atoms are present in the ozone?

A)1
B)2
C)3
D)4

Question 7

_______ is produced by subjecting oxygen to high electric voltage.

A)Carbon-monoxide
B)Carbon-dioxide
C)Pure oxygen
D)Ozone

Question 8

Which of the following can be inactivated using ozone?

A)Algae
B)Fungi
C)Protozoa
D)All microbes

Question 9

Which of these is not an advantage of Ozonation?

A)Reaction with bacteria
B)Organics degradation
C)Equipment costs
D)Chemicals

Question 10

Which of the following is not a disadvantage of Ozonation?

A)Chemicals
B)Costs
C)Energy
D)Fire hazard

Question 11

Which of the following is not removed by Ozonation?

A)Iron
B)Manganese
C)Magnesium
D)Bacteria

Question 12

What is the maximum time required for ozone degradation?

A)15 minutes
B)30 minutes
C)45 minutes
D)60 minutes

Question 13

What is the average ozone concentration created during Ozonation?

A)1000 mg/l
B)5000 mg/l
C)10000 mg/l
D)15000 mg/l

Question 14

Which of the following is not correct regarding Ozonation?

A)Does not requires chemicals
B)Eliminates bad taste
C)Eliminates odour
D)Operational costs are low

Question 15

What is the colour of ozone?

A)Violet
B)White
C)Grey
D)Colourless

Question 16

Ozone is formed by the interaction of _______

A)UV or O₂
B)O and O₂
C)O and UV
D)O₂ and CO

Question 17

In which year was the structure of ozone determined?

A)1865
B)1875
C)1885
D)1895

Question 18

In which year was the ozone named?

A)1829
B)1839
C)1849
D)1859

Question 19

At what pH ozonation is carried out?

A)8
B)9
C)11
D)7

Question 20

Photo catalysis uses which of the following methods to produce free radicals?

A)UV rays
B)UV + TiO₂
C)Ozone + UV
D)TiO₂

Question 21

How is the electrical requirement for the ozonation process expressed mathematically?

A)EE/O =EEt/ Vlog(Ci-Cf)
B)EE/O =EEt/ (Ci-Cf)
C)EE/O =EEt Vlog(Ci-Cf)
D)EE/O =EEt(Ci-Cf)

Question 22

What are the byproducts of the breakdown of the organic compounds by UV rays?

A)CO
B)CO₂ + H₂O
C)H₂CO₃ and water
D)CO + H₂O

Question 23

In what range is the EE/O present in order to reduce one log of reduction?

A)0-20 KWH
B)20-265 KWH
C)265-365 KWH
D)365-650 KWH

Question 24

Primary sludge includes __________

A)Total suspended solids
B)Suspended solids
C)Removable solids
D)Settleable solids

Question 25

Which of the following methods are used in rural communities?

A)Aerobic digestion
B)Mechanical dewatering
C)Dewatering
D)Composting