15569992
Descripción
Test por Joe Jorgensen, actualizado hace más de 1 año
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Creado por Joe Jorgensen
hace alrededor de 6 años
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Pregunta 1
Pregunta
Temperature has no effect on the sedimentation rate of a particle.
Respuesta
- True
- False
Pregunta 2
Pregunta
Chloramines are toxic to healthy humans.
Respuesta
- True
- False
Pregunta 3
Pregunta
If head loss is a problem but breakthrough is limited, larger sized media may be appropriate.
Respuesta
- True
- False
Pregunta 4
Pregunta
A slow sand filter should be backwashed when the head loss through the filter becomes excessive.
Respuesta
- True
- False
Pregunta 5
Pregunta
Coagulation and flocculation are used to remove materials, especially non-settleable solids and color.
Respuesta
- True
- False
Pregunta 6
Pregunta
The inlet zone of a sedimentation basin is designed to minimize velocities near the bottom of the basin to prevent scouring.
Respuesta
- True
- False
Pregunta 7
Pregunta
Smooth circular particles will settle slower than irregular particles.
Respuesta
- True
- False
Pregunta 8
Pregunta
Backwash at too high a rate is much less destructive than at too low a backwash rate
Respuesta
- True
- False
Pregunta 9
Pregunta
Water with low turbidity is just as difficult to treat as those with increased turbidity.
Respuesta
- True
- False
Pregunta 10
Pregunta
The detention time may be defined as the actual time that a small amount of water is retained in the sedimentation basin.
Respuesta
- True
- False
Pregunta 11
Pregunta
Chlorine gas is extremely toxic and corrosive in moist atmospheres.
Respuesta
- True
- False
Pregunta 12
Pregunta
In most types of filtration, particles are removed mainly by straining.
Respuesta
- True
- False
Pregunta 13
Pregunta
Free available residual chlorine has the greatest disinfecting action of the chlorine compounds.
Respuesta
- True
- False
Pregunta 14
Pregunta
A long, narrow rectangular sedimentation tank is the shape most likely to have short-circuiting problems.
Respuesta
- True
- False
Pregunta 15
Pregunta
The Interim Enhanced Surface Water Treatment Rule does not address Cryptosporidium.
Respuesta
- True
- False
Pregunta 16
Pregunta
The turbidity requirement under the Interim Enhanced Surface Water Treatment rule is < 0.3 NTU.
Respuesta
- True
- False
Pregunta 17
Pregunta
150 lb. chlorine cylinders may be stored on their sides
Respuesta
- True
- False
Pregunta 18
Pregunta
Ozone is highly reactive.
Respuesta
- True
- False
Pregunta 19
Pregunta
When water temperatures increase, the flow through a sedimentation basin must be decreased.
Respuesta
- True
- False
Pregunta 20
Pregunta
Too high a backwash rate may cause excessive loss of filter media.
Respuesta
- True
- False
Pregunta 21
Pregunta
Chlorine gas is lighter than air.
Respuesta
- True
- False
Pregunta 22
Pregunta
Alum Sludge is often returned to plant to "condition" raw water.
Respuesta
- True
- False
Pregunta 23
Pregunta
Rapid Sand filters trap suspended matter in the biologically active Schmutzdecke.
Respuesta
- True
- False
Pregunta 24
Pregunta
There is no minimum requirement for distribution chlorine residual under the SWTR.
Respuesta
- True
- False
Pregunta 25
Pregunta
Floc gathers together during the flash-mixing process.
Respuesta
- True
- False
Pregunta 26
Pregunta
If the chlorine demand has been met and there is still chlorine in the water, what is the remaining chlorine called?
Respuesta
-
Breakpoint
-
Residual
-
Dose
-
Demand
Pregunta 27
Pregunta
Gas Chlorine is ______________________?
Respuesta
-
2.5 times heavier than air
-
A greenish-yellow cloud
-
An oxidant
-
All of the above
Pregunta 28
Pregunta
What is the difference between conventional and direct filtration?
Respuesta
-
No sedimentation
-
No coagulation
-
No Flocculation
-
No disinfection
Pregunta 29
Pregunta
Turbidity is the expression of the _____________ of the water?
Respuesta
-
Alkalinity
-
pH of the water
-
Clarity
-
Water temperature
Pregunta 30
Pregunta
Which of the following is more resistant to disinfection
Respuesta
-
Turbidity
-
Cysts
-
Coliform
-
All of the Above
Pregunta 31
Pregunta
Water with a pH of 9 would be considered?
Respuesta
-
Acidic
-
Neutral
-
Ugly
-
Basic
Pregunta 32
Pregunta
Currents within a settling basin could cause _____________.
Respuesta
-
Low turbidity readings
-
Color in the finished water
-
Short-circuiting
-
Oxygen depletion
Pregunta 33
Pregunta
The main purpose of the jar test is to determine the best?
Respuesta
-
Chlorine residual
-
Coagulant dosage
-
Detention time
-
Particulate settling velocity
Pregunta 34
Pregunta
Filtration technologies used to comply with Surface Water Treatment Rule include
Respuesta
-
Conventional
-
Slow Sand
-
Direct
-
All of the above
Pregunta 35
Pregunta
Organic matter combined with chlorine can create?
Respuesta
-
Septic conditions
-
Trihalomethanes
-
Acidic water unfit for human consumption
-
Legionella
Pregunta 36
Pregunta
The coagulation process usually occurs within?
Respuesta
-
30 seconds
-
5 minutes
-
15 minutes
-
30 minutes
Pregunta 37
Pregunta
What is coagulation?
Respuesta
-
Clumping together of very fine particles into larger particles by the use of chemicals
-
Very small, finely divided solids that remain dispersed in a liquid for a long time
-
Gathering together of fine particles to form larger particles by a process of gentle mixing
-
Removal of particles through gravity
Pregunta 38
Pregunta
Field test method for chlorine is conducted using _________ method
Respuesta
-
Electrometric
-
Spans
-
DPD
-
OPR
Pregunta 39
Pregunta
Which is not a characteristic of a rectangular sedimentation basin?
Respuesta
-
Tolerates changes in water quality
-
Cost effective
-
Predictable performance
-
More likely to short circuit
Pregunta 40
Pregunta
Why should a minimum of two sedimentation basins be provided in all water treatment plants?
Respuesta
-
To allow for cleaning of a basin without requiring a plant shutdown
-
To minimize short-circuiting problems
-
To reduce the number of operators needed for O & M
-
Take advantage of common-wall technology
Pregunta 41
Pregunta
The Surface Water Treatment Rule requires ______ and ______ of Giardia
Respuesta
-
Coagulation and sedimentation
-
Removal and inactivation
-
Disinfection and flocculation
-
Coagulation and disinfection
Pregunta 42
Pregunta
What is the purpose of the filtration process?
Respuesta
-
Cause very fine particles to clump together into larger particles
-
Kill disease-causing organisms
-
To remove particulate impurities and floc
-
Settle out larger suspended particles
Pregunta 43
Pregunta
What is the purpose of the effluent zone in the sedimentation basin?
Respuesta
-
To provide smooth transition from the sedimentation basin to the settle water channel
-
To provide compression settling of the sludge
-
To reduce short-circuiting of water in the basin
-
To provide calm, undisturbed storage of flocculated water
Pregunta 44
Pregunta
When added to water, chlorine will react with?
Respuesta
-
Organic substances
-
Hardness
-
Inorganic substances
-
Both a and c
Pregunta 45
Pregunta
On the chlorination breakpoint curve, between points 2 & 3 chlorine reacts with ammonia to form?
Respuesta
-
Monochloramine
-
Free chlorine
-
Dichloramine
-
Trichloramine
Pregunta 46
Pregunta
What is flocculation?
Respuesta
-
Clumping together of very fine particles into larger particles by the use of chemicals
-
Gathering together of fine particles to form larger particles by the process of gentle mixing
-
Removal of iron and manganese
-
Very small, finely divided solids that remain dispersed in a liquid for a long time
Pregunta 47
Pregunta
A disinfected water supply is one in which
Respuesta
-
Bacteria and viruses have been sterilized
-
Algae has been destroyed
-
Pathogenic organisms have been inactivated or destroyed
-
All of the above
Pregunta 48
Pregunta
Which is not a form of Chlorine?
Respuesta
-
Calcium Hypochlorite
-
Gas
-
Sodium Chloride
-
Sodium Hypochlorite
Pregunta 49
Pregunta
Why is ozone prepared onsite?
Respuesta
-
Because it acts quicker when produced at the application point
-
Because it is difficult to store in conventional containers
-
Because it is produced on demand
-
Because it is very unstable
Pregunta 50
Pregunta
Which is the correct order of filter materials in a multi-media or mixed media gravity filter (From top to Bottom)?
Respuesta
-
Coal, Garnet, Sand
-
Coal, Sand, Garnet
-
Garnet, Sand, Coal
-
Sand, Coal, Garnet
Pregunta 51
Pregunta
Flash mixing includes
Respuesta
-
Blinders
-
Surface currents
-
Baffled chambers
-
Barometric loops
Pregunta 52
Pregunta
Tube settlers
Respuesta
-
Create mini basins
-
Are not cost effective
-
Increase the operational cost of sedimentation
-
None of the above
Pregunta 53
Pregunta
Most natural occurring particles in water are ____________
Respuesta
-
Positive charged
-
Have no charge
-
Negatively charged
-
Are bi-polar
Pregunta 54
Pregunta
The disinfectant with the greatest disinfection potential is?
Respuesta
-
Hypochlorous Acid (HOCI)
-
Monochloramine
-
Hydrochloric Acid (HCI)
-
Hypochlorite Ion (OCI)
Pregunta 55
Pregunta
The removal efficiency of a filter depends on the _____________
Respuesta
-
Chemical characteristics of the water being treated
-
Degree/type of pretreatment
-
Nature of suspension
-
All of the above
Pregunta 56
Pregunta
In determining the purity of a water sample, it is usually tested for the presence of coliform bacteria because ___________.
Respuesta
-
It can be detected using a microscope
-
It can be done in the field
-
It is one of the disease-bearing bacteria
-
Its presence may indicate that the water has been contaminated
Pregunta 57
Pregunta
Most important filter effluent water quality change is?
Respuesta
-
Chlorine demand
-
Nutrients
-
Turbidity
-
pH
Pregunta 58
Pregunta
Factors affecting particle settling include
Respuesta
-
Size
-
Density
-
Charge
-
All of the above
Pregunta 59
Pregunta
How are particles removed by slow sand filtration?
Respuesta
-
By chemical and physical disinfection
-
By straining, adsorption and biological action
-
By operation and maintenance procedures
-
By coagulation, flocculation and sedimentation
Pregunta 60
Pregunta
Good filter media characteristics include?
Respuesta
-
Soft material
-
Highly soluble in water
-
Non-permeable
-
Inert
Pregunta 61
Pregunta
Why is the turbidity of the water important when disinfecting water?
Respuesta
-
Excessive turbidity will cause a significant shift in pH
-
Excessive turbidity will greatly reduce the efficiency of the disinfection chemical process
-
Excessive turbidity will cause a change in the hardness
-
Excessive turbidity will cause an adjustment
Pregunta 62
Pregunta
What could be the cause of floc size breaking up in flocculates?
Respuesta
-
Coagulent chemicals are inadequately mixed
-
Detention time too long
-
Mixing intensity is too high
-
Polymer dosage is too high
Pregunta 63
Pregunta
Short circuiting in a sedimentation basin can be caused by
Respuesta
-
Poor inlet baffling
-
Improper design
-
High inlet velocities
-
All of the above
Pregunta 64
Pregunta
Which is not a zone in a sedimentation basin?
Respuesta
-
Inlet zone
-
Sludge zone
-
Aeration zone
-
Settling zone
Pregunta 65
Pregunta
Destruction of harmful bacteria by chlorine is directly related to
Respuesta
-
Contact time and chlorine concentration
-
Efficient chlorine dosage levels
-
Whether or not breakpoint chlorination is practiced
-
Whether perchlorination is practiced
Pregunta 66
Pregunta
Which is not an important factor when evaluating jar test results?
Respuesta
-
Amount of floc formed
-
Alkalinity
-
Floc settling rate
-
Size of floc
Pregunta 67
Pregunta
Visual checks of the sedimentation basin include?
Respuesta
-
Floc settling characteristics
-
Clarity of laundered water
-
Distribution of floc at basin inlet
-
All of the above
Pregunta 68
Pregunta
The surface water treatment rule requires which removal rate for Giardia?
Respuesta
-
3 log
-
2 log
-
4 log
-
1 log
Pregunta 69
Pregunta
The Interim Enhanced Surface Water Treatment Rule requires the maintenance of a minimum distribution chlorine residual of?
Respuesta
-
0.2 mg/L
-
1.0 mg/L
-
2.0 mg/L
-
0.5 mg/L
Pregunta 70
Pregunta
Weak floc _____________?
Respuesta
-
Does not adhere to filter media
-
Can be carried deep into filter
-
Causes increased turbidity of filtered water
-
All of the above
Pregunta 71
Pregunta
What operation changes in the sedimentation process should be considered by operators when colder water temperatures develop?
Respuesta
-
Faster sludge removal rates must be Implemented
-
Surface skimming rates must be increased
-
Chemical dosages must be adjusted
-
None of the above
Pregunta 72
Pregunta
For conventional filtration plant under the IESWTR, the allowable filter effluent turbidity measured in 95% of the samples collected in a month is ___________ NTU?
Respuesta
-
0.5
-
0.3
-
1.0
-
5.0
Pregunta 73
Pregunta
What is a limitation of using ultraviolet rays for disinfection?
Respuesta
-
The disruption of selective organic components of the cell
-
The removal of destroyed pathogenic microorganisms
-
The lack of a measurable residual
-
The selection of the optimum wave length
Pregunta 74
Pregunta
The "Total Coliform Rule" of the SDWA regulations requires the result of coliform testing to be given as?
Respuesta
-
MPN
-
Colony forming units (CFUs)
-
mg/L
-
presence/absence
Pregunta 75
Pregunta
What is the maximum feed rate in pounds per day from a 150lb. chlorine cylinder?
Respuesta
-
10 lbs.
-
20 lbs.
-
40 lbs.
-
80 lbs.
Pregunta 76
Pregunta
The inactivation of pathogenic organisms is called?
Respuesta
-
Sterilization
-
Oxidation
-
Pasteurization
-
Disinfection
Pregunta 77
Pregunta
The use of gas chlorine tends to _____________ the pH
Respuesta
-
Lower
-
No effect
-
Raise
-
Neutralize
Pregunta 78
Pregunta
Parameters which affect disinfection include
Respuesta
-
Color
-
pH
-
Temperature
-
Both b and c
Pregunta 79
Pregunta
Chlorine Dioxide is composed of ______________ and chlorine
Respuesta
-
Ammonia
-
Oxygen
-
Hydrogen Dioxide
-
Sodium Chloride
Pregunta 80
Pregunta
Sodium Hypochlorite is the active ingredient in _______________
Respuesta
-
Liquid chlorine
-
Powdered chlorine
-
Granular chlorine
-
Gas chlorine
Pregunta 81
Pregunta
The reaction zone in a solids contact clarifier is 15 feet in diameter and 8 feet high. What is the detention time in minutes if the flow is 5 million gallons per day?
Respuesta
-
3 gallons per minute
-
3472 gallons per minute
-
3.04 minutes
-
10,562.2 gallons
-
5 minutes
Pregunta 82
Pregunta
A well has a flow of 2500 rpm and a chlorine residual of 2.0 mg/L is required. The demand is 0.5 mg/L. If calcium hypochlorite 65% available chlorine is used, how many lbs./day of hypochlorite is required?
Respuesta
-
3.6 lbs/day
-
65 lbs/day
-
75 lbs/day
-
92 lbs/day
-
115 lbs/day
Pregunta 83
Pregunta
Calculate the filtration rate in gallons per minute, per square foot (GPM/ft2) for a filter with a length of 50 feet by 40 feet when the applied flow is 3 million gallons per day?
Respuesta
-
10 GPM/ft2
-
3.5 GPM/ft2
-
2.0 GPM/ft2
-
2.5 GPM/ft2
-
1.0 GPM/ft2
Pregunta 84
Pregunta
Treatment plant has a flow of 900 GPM and an average turbidity of 10 ntu. A total of 180 lbs. of alum is used in 24 hours. What is the alum dosage in mg/L?
Respuesta
-
0.6 mg/L
-
10 mg/L
-
17 mg/L
-
28 mg/L
-
138 mg/L
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