Deck 6: Demineralisation Plant Design and Water Treatment

Question 1

While designing the demineralisation plant what is considered as the weak acidic cation load?

A)alkaline hardness
B)alkaline hardness+ ema
C)ema
D)silica

Answer 1

alkaline hardness

Question 2

While designing the demineralisation plant what is considered as the strong acidic cation load?

A)alkaline hardness
B)alkaline hardness + ema
C)ema
D)silica

Answer 2

alkaline hardness + ema

Question 3

While designing the demineralisation plant what is considered as the strong basic anion load?

A)alkaline hardness
B)alkaline hardness + ema+co₂
C)ema+silica
D)silica+co₂+ alkalinity+ema

Answer 3

silica+co₂+ alkalinity+ema

Question 4

While designing the demineralisation plant what is considered as the weak basic anion load?

A)alkaline hardness
B)alkaline hardness + ema
C)ema
D)silica

Question 5

When is strong basic anion not necessary?

A)silica is nil
B)co₂ is nil
C)fluroine is nil
D)sulphate is nil

Question 6

When the hardness and alkalinity are around 30% what should be used?

A)sac
B)wac
C)wac, sac
D)wac, sac, wba

Question 7

In case along with silica, there is high content in sulphide and chloride what should be used?

A)wba
B)wba and sba
C)sba
D)sba,wba and wac

Question 8

For obtaining Silica<5 ppm which of these should be utilized?

A)sba followed by mixed be
B)sba
C)wba sba followed by mixed bed
D)mixed bed

Question 9

In which year was the Ferrosand process patented?

A)1960
B)1965
C)1970
D)1975

Question 10

What is the permitted concentration of manganese in drinking water?

A)30 g/l
B)40 g/l
C)50 g/l
D)60 g/l

Question 11

What is the permitted concentration of arsenic in drinking water?

A)10 g/l
B)20 g/l
C)30 g/l
D)40 g/l

Question 12

What is the minimum time of aeration?

A)20 minutes
B)40 minutes
C)60 minutes
D)80 minutes

Question 13

What is the tank volume of aeration for water flow of 50m³/h?

A)40 m³
B)50 m³
C)80 m³
D)100 m³

Question 14

At what pH should the water be maintained?

A)6.5
B)7.5
C)8.5
D)9

Question 15

The aeration system will decrease the redox potential of the water.

Question 16

What is the minimum required redox potential of water?

A)100 mv
B)200 mv
C)300 mv
D)400 mv

Question 17

Manganese oxidation requires a high oxidation potential.

Question 18

What is the desirable bed depth for AFM filtration?

A)1000 mm
B)1200 mm
C)1500 mm
D)1800 mm

Question 19

What is the maximum allowable flow for backwash?

A)20 m/hr
B)45 m/hr
C)60 m/hr
D)80 m/hr

Question 20

The fluoride concentration for prevention of dental caries is________                

A)1mg/l
B)2mg/l
C)3mg/l
D)4mg/l

Question 21

In which process, the fluoride content of water is raised?

A)chlorination
B)fluoridation
C)defluoridation
D)flocculation

Question 22

Which of the following is not used as a fluoride compound?

A)sodium fluoride
B)sodium silico fluoride
C)hydrofluosilicic acid
D)sodium fluro carbonate

Question 23

Which of the following is the pure compound?

A)sodium fluoride
B)sodium silico fluoride
C)hydrofluosilicic acid
D)sodium fluro carbonate