Florida DW Class B Exam Study Guide
#2 Correct 100%
Use reverse osmosis if the turbidity is less than - ANSWER 5 ntu's
If you want zero hardness then use - ANSWER Ion exchange
The ability of a reverse osmosis membrane to reject salt while permeating water -
ANSWER Salt rejection
The number of people who directly report to individual supervisor or manager refers to -
ANSWER Span of control
What is most important in planning? - ANSWER Setting goals and objectives
Operator license may be revoked if - ANSWER Operating plant unsafe and causing
unsafe harm to public, threat to public health and environment
Radionuclides surface water every ____ months - ANSWER 48 months
Radionuclides ground water every ____ months - ANSWER 48 months
Radiological contaminants - ANSWER Monitor every four years
Ground water plants conduct lab test - ANSWER Every three hours
Surface water plants test for inorganics _____ a year - ANSWER once
Jar test - ANSWER Determine proper dosage rates
Chlorine has medicine taste - ANSWER phenolic
Phosphates good for 48 hours then revert to - ANSWER Orthophosphates in distribution
system
Know that when a marble test water went to a plus .02 water that: - ANSWER Saturated
Belt filter press, dewatered by - ANSWER Gravity and pressure
Cause of lower than normal product rate flow - ANSWER Replace element or use acid
to clean
You're standing over a flash mixer monitoring water what do you look for? - ANSWER
Floc size and shape
, Recovery rate is controlled by - ANSWER Increasing feed flow
Brackish water - ANSWER 1000 to 10,000 Tds
Large light floc does not settle, and small dense floc are more likely to - ANSWER
Shearing
Most common lab test used to monitor coagulation and flocculation are: - ANSWER
Turbidity, temperature, Color, PH, and chlorine demand
Sedimentation basins have four zones - ANSWER Inlet zone, settling zone, sludge
zone, and outlet zone
The solids contact process combines the ______, _______, & _______ process into a
single basin - ANSWER Coagulation, flocculation, sedimentation
Solids contact units are very sensitive to changes in - ANSWER Influent flow &
temperature (not wind)
If the sludge concentration is too low in solids (Soupy) decrease the ____________. -
ANSWER Frequency of the sludge removal
Backwash flow rates ranging from ____ to ____ gpm sqft of filter media - ANSWER 10
to 25 gpm/sq. ft.
(Usually required to filter adequately)
What is the filtration rate that the water passes through the granular filter media -
ANSWER May vary from 2 to 10 GPM/SqFt
Filtration efficiency reductions of over __________ % can be achieved under optimal
conditions - ANSWER 99.5%
Anything that would cause membrane clog without excessive pretreatment eliminates -
ANSWER Reverse osmosis
Know XYZ management: public water systems, 40 samples, What % can be positive for
the month? - ANSWER No more than one
Ozone and chlorine dioxide pose special problems because of their instability. Both
should be produced - ANSWER On site
When chlorine is added to organic matter it makes - ANSWER Chlororganic compound
R.O. may be used if organics or color in the water.. - ANSWER Is less than 3 mg/L
#2 Correct 100%
Use reverse osmosis if the turbidity is less than - ANSWER 5 ntu's
If you want zero hardness then use - ANSWER Ion exchange
The ability of a reverse osmosis membrane to reject salt while permeating water -
ANSWER Salt rejection
The number of people who directly report to individual supervisor or manager refers to -
ANSWER Span of control
What is most important in planning? - ANSWER Setting goals and objectives
Operator license may be revoked if - ANSWER Operating plant unsafe and causing
unsafe harm to public, threat to public health and environment
Radionuclides surface water every ____ months - ANSWER 48 months
Radionuclides ground water every ____ months - ANSWER 48 months
Radiological contaminants - ANSWER Monitor every four years
Ground water plants conduct lab test - ANSWER Every three hours
Surface water plants test for inorganics _____ a year - ANSWER once
Jar test - ANSWER Determine proper dosage rates
Chlorine has medicine taste - ANSWER phenolic
Phosphates good for 48 hours then revert to - ANSWER Orthophosphates in distribution
system
Know that when a marble test water went to a plus .02 water that: - ANSWER Saturated
Belt filter press, dewatered by - ANSWER Gravity and pressure
Cause of lower than normal product rate flow - ANSWER Replace element or use acid
to clean
You're standing over a flash mixer monitoring water what do you look for? - ANSWER
Floc size and shape
, Recovery rate is controlled by - ANSWER Increasing feed flow
Brackish water - ANSWER 1000 to 10,000 Tds
Large light floc does not settle, and small dense floc are more likely to - ANSWER
Shearing
Most common lab test used to monitor coagulation and flocculation are: - ANSWER
Turbidity, temperature, Color, PH, and chlorine demand
Sedimentation basins have four zones - ANSWER Inlet zone, settling zone, sludge
zone, and outlet zone
The solids contact process combines the ______, _______, & _______ process into a
single basin - ANSWER Coagulation, flocculation, sedimentation
Solids contact units are very sensitive to changes in - ANSWER Influent flow &
temperature (not wind)
If the sludge concentration is too low in solids (Soupy) decrease the ____________. -
ANSWER Frequency of the sludge removal
Backwash flow rates ranging from ____ to ____ gpm sqft of filter media - ANSWER 10
to 25 gpm/sq. ft.
(Usually required to filter adequately)
What is the filtration rate that the water passes through the granular filter media -
ANSWER May vary from 2 to 10 GPM/SqFt
Filtration efficiency reductions of over __________ % can be achieved under optimal
conditions - ANSWER 99.5%
Anything that would cause membrane clog without excessive pretreatment eliminates -
ANSWER Reverse osmosis
Know XYZ management: public water systems, 40 samples, What % can be positive for
the month? - ANSWER No more than one
Ozone and chlorine dioxide pose special problems because of their instability. Both
should be produced - ANSWER On site
When chlorine is added to organic matter it makes - ANSWER Chlororganic compound
R.O. may be used if organics or color in the water.. - ANSWER Is less than 3 mg/L
