WorksheetsQUIZZ -2 WATER TECHNOLOGY
Total questions: 52
Worksheet time: 25mins
The process of removing extra common salt from water is called:
Ionization
Softening
Disinfections
Desalination
Swimming for a long time in salt water makes the skin of ones fingertips wrinkled. Which one of the following properties is responsible for this observation?
Osmosis
Dialysis
Electrodialysis
Coagulation
Which of the following ion get released from the cation exchange column?
Ca+2
K+
Na+
H+
Which of the following ion get released from the anion exchange column?
SO4-2
Cl–
OH–
CO3-2
Ion-free water coming out from the exchanger is known as ____________
Demineralised water
Potable water
Disinfected water
Coagulated water
The exhausted cation exchange column is regenerated by passing a solution of ____________
Conc. NaCl
Conc. HCl
Dil. HCl
Dil. NaCl
The exhausted anion exchange column is regenerated by passing a solution of ____________
Dil. KOH
Conc. KOH
Conc. NaOH
Dil. NaOH
In ion-exchange process, the capital cost is _________ and the operational expenses are ______________
High, low
High, high
Low, low
Low, high
The residual hardness in ion-exchange process is ____________
0-2 ppm
10-15 ppm
20-30 ppm
5-10 ppm
The raw water used for ion-exchange process should be turbid.
True
False
Ion exchange process is also called as ___________
) Lime soda process
Zeolite process
Demineralization
Permutit’s process
The hardness in the ion exchange process is reduced to ________
0-2 ppm
0-3 ppm
0-4 ppm
0-1 ppm
The total __________ are removed completely in the ion exchange pproces
Dissolved other impurities
Dissolved gases
Dissolved solvents
Dissolved solids
2RNa+ + Ca+2
↔..... ..... + 2Na+
(a)
Water treatment process (seawater desalination) is opposite to natural osmosis is
Reverse Osmosis
Ultrafiltration
Nanofiltration
Microfiltration
Min pressure to be applied to prevent the water flow through semipermeable membrane
Hydraulic pressure
Reverse pressure
Osmotic pressure
Membrane pressure
Forward osmosis driven by ....
hydraulic pressure
osmotic pressure
Osmosis - water movement through semi permeable membrane
True
False
The cation exchanger has the following functional group
-COOH
-NH2R
-NO2
Ion exchange process can be used for
Synthesizing new compounds
Softening hard water
Separation of compounds
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called
Equivalent evaporation
Evaporative capacity
Boiler efficiency
Factor of evaporation
The process of heating in the boiler is considered as
Steady flow process
Unsteady flow process
Constant temperature process
None of the above
For combustion of a fuel, following is essential-
Correct fuel air ratio
Proper ignition temperature
O₂ to support combustion
All the three above
Use the illustration of the water treatment plant to answer this question. What is the first step?
aeration
coagulation
sedimentation
filtration
disinfection
Use the illustration of the water treatment plant to answer this question. What is the second step?
aeration
coagulation
sedimentation
filtration
disinfection
Use the illustration of the water treatment plant to answer this question. What is the third step?
aeration
coagulation
sedimentation
filtration
disinfection
Use the illustration of the water treatment plant to answer this question. What is the fourth step?
aeration
coagulation
sedimentation
filtration
disinfection
Use the illustration of the water treatment plant to answer this question. What is the fifth step?
aeration
coagulation
sedimentation
filtration
disinfection
Is this statement true or false?
When the water cycle gets out of balance, it does not take long for it to balance out again.
True
False
Describe aeration
Water is mixed with air to get rid of any other gases that might be mixed in.
Alum and other chemicals are added to the water to form small, sticky particles called floc.
Particles that are too heavy to float settle to the bottom of the water.
Water is poured through layers of materials that trap things that will not settle.
Chlorine is added to remove any germs such as bacteria
Describe coagulation
Water is mixed with air to get rid of any other gases that might be mixed in.
Alum and other chemicals are added to the water to form small, sticky particles called floc.
Particles that are too heavy to float settle to the bottom of the water.
Water is poured through layers of materials that trap things that will not settle.
Chlorine is added to remove any germs such as bacteria
Describe sedimentation
Water is mixed with air to get rid of any other gases that might be mixed in.
Alum and other chemicals are added to the water to form small, sticky particles called floc.
Particles that are too heavy to float settle to the bottom of the water.
Water is poured through layers of materials that trap things that will not settle.
Chlorine is added to remove any germs such as bacteria
Describe filtration
Water is mixed with air to get rid of any other gases that might be mixed in.
Alum and other chemicals are added to the water to form small, sticky particles called floc.
Particles that are too heavy to float settle to the bottom of the water.
Water is poured through layers of materials that trap things that will not settle.
Chlorine is added to remove any germs such as bacteria
Describe disinfection
Water is mixed with air to get rid of any other gases that might be mixed in.
Alum and other chemicals are added to the water to form small, sticky particles called floc.
Particles that are too heavy to float settle to the bottom of the water.
Water is poured through layers of materials that trap things that will not settle.
Chlorine is added to remove any germs such as bacteria
improved water quality can be achieved by
appropriate use of water
careful water storage and handling
proper land management
all of the above
A small city gets its drinking water from the river running through its center. This river is fed by rivers that flow down the mountains nearby.How would excessive rainfall in the mountains most likely affect the turbidity of this local water source?
A. Heavy rainfall would decrease the turbidity of the river downstream.
B. Heavy rainfall would increase the turbidity of the river downstream.
C. Heavy rainfall would increase the turbidity of only rivers upstream.
D. Heavy rainfall would decrease the turbidity of only rivers upstream.
Hardness in water is caused by the presence of:
Sodium chloride
Sodium carbonate
Calcium chloride
Potassium nitrate
Permanent hardness in water is caused by the presence of:
Calcium bicarbonate
Magnesium sulfate
Both of them
None of them
Water is hard when it contains:
Acid solution
Precipitate in suspension
Dissolved sodium salts
Dissolved Ca and Mg salts
Scale formation in boilers causes
no loss of heat
wastage of heat
increase in efficiency
none of the above
Blow-down operation causes the removal of
SCALES
SLUDGES
BOTH OF THESE
HOT WATER ONLY
Hard water is unfit for use in boilers for “steam raising” because
its boiling point is higher
steam generated at a high pressure
it leads to scale formation inside the boiler
water undergoes decomposition in to oxygen and hydrogen.
Coagulants help in the settling of
suspended impurities only
fine suspended matter only
colloidal particles only
both (B) and (C)
Total hardness equals
Temporary hardness
Permanent hardness
Temporary hardness + Permanent Hardness
Temporary hardness - Permanent Hardness
Temporary hardness is due to the presence of
Bicarbonates of Ni & Mg
Bicarbonates of Ca & Mg
Chlorides of Ca & Ni
Sulphates of Mg & Ca
Boiler feed water contains hardness of
0 PPM
< 0.2 PPM
> 0.2 PPM
= 0.2 PPM
The indicator employed for detection of hardness during titration with EDTA solution is
Methyl orange
Phenolphthalein
Eriochrome-Black-T
Diphenyl amine
