WASTER WATER OPERATOR 1
PRACTICE EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS |A+
GRADE
bearing lubrication and connection - Anwser//What does a
gradual increase in the bearing temperature of a centrifugal
blower indicate? detention time - Anwser//The time is takes for
a unit volume of wastewater to pass entirely through a primary
clarifier is called centrifugal - Anwser//Pumps are often
required to bring wastewater into a treatment plant. What
types of pumps are typically used to lift influent wastewater?
typhoid fever, dysentery, cholera - Anwser//Three waterborne
diseases are 2-5 mg/L - Anwser//Conventional activated sludge
systems typically operate with a DO range of: SDS -
Anwser//Which of the following provides safety information for
potentially hazardous or toxic materials? alert the operator on
duty - Anwser//The first step the maintenance staff should take
in properly locking and tagging out a piece of equipment is to:
Denitrification - Anwser//Which of the following would NOT be
considered preliminary treatment? 19.5% - Anwser//Oxygen
deficiency becomes a concern when the oxygen level in a
confined space is less than Air Lift - Anwser//This type of pump
injects compressed air into a discharge line, which mixes and
raises solids through the line due to sludge density. Nitrification
- Anwser//The appearance of duckweed in a final clarifier is an
indication of: Packing - Anwser//This material can be made
from Teflon or graphite and is used to prevent leakage between
moving parts of a pump: make no adjustment - Anwser//What
is the first course of action if you see a slow constant drip from
a pump shaft packing seal? mixed liquor volatile suspended
solids - Anwser//Which of the following types of solids most
,accurately represent the microorganisms in the activated
sludge process? none, it must analyzed immediately -
Anwser//What is the maximum recommended holding time for
a sample that is to be analyzed for pH? Reciprocating -
Anwser//This type of positive displacement pump consists of a
piston that moves back and forth sodium sulfite solution -
Anwser//Most DO probes come with an electronic zero for
calibration. What should be used to check the accuracy of this
feature on a DO probe? secured together - Anwser//When
working in an area with two or more floor coverings (for
example, grating and checker-plate), be sure that they are
always Hydrogen sulfide - Anwser//A rotten egg smell in
wastewater can most likely be attributed to: an area where
conditions are very calm and no mixing is taking place -
Anwser//A "dead" spot in an activated sludge biological reactor
is typically identified visually as bacteria - Anwser//When
organic wastes are discharged to receiving waters, oxygen is
depleted by lock and tag out the equipment - Anwser//When
planning to work on or near electrical equipment, be sure to
always 1.5 hours - Anwser//What would be considered a typical
design detention time for a primary clarifier? Diaphragm -
Anwser//This type positive displacement pump consists of a
reciprocating membrane. Material fills a chamber as the
membrane flexes and gets forced out through a discharge
check valve: Sand - Anwser//Grit is composed mostly of
Indicators - Anwser//Coliform bacteria are Screenings -
Anwser//large debris (sticks, rocks, etc.), large floating solids,
and fibrous materials (rags, strings, cloth, etc.) are categorized
as Centrifugal - Anwser//This type of pump, commonly used to
pump wastewater, may contain open or closed impellers
supported on a shaft. When liquid enters this pump,
mechanical forces convey flow through the discharge: mild,
musty - Anwser//healthy activated sludge has what type of
smell? beaker - Anwser//What piece of lab glassware is used
mainly to mix chemicals and measure approximate volumes?
,ultraviolet radiation - Anwser//After chlorine, what is the most
common effluent wastewater disinfection techniques or agent
used in the U.S. today? annually - Anwser//How often should
the scraper arms and blades of a circular clarifier be inspected
and replaced, if necessary? Settleable solids - Anwser//A
properly designed primary clarifier will remove 90 percent of
which of the following: rotten eggs - Anwser//Hydrogen sulfide
gives off an odor similar to Cavitation - Anwser//This condition
is the result of low pressures within a pump, which creates
coiling water and vapor bubbles. Damage to the impeller can
happen when these vapor bubbles pop: Submersible -
Anwser//In this type of centrifugal pump, the motor is sealed
and closed-coupled to the pump. This pump typically pushes
flow from the bottom of a pit into a discharge line: Parshall
Flume - Anwser//Which of the following is a typical piece of
flow measuring equipment? at the downstream end of the
chlorine contact tank - Anwser//Which of the following is an
appropriate location to collect a final effluent sample for
chlorine residual test? Volumetric Pipette - Anwser//Of the
following, the most precise piece of lab equipment for
measuring liquid would be: notify local police or sheriff -
Anwser//Which of the following would be the safest action to
take in the event of a major chlorine container leak? turn off
and lock motor control - Anwser//A spray nozzle on the
mechanically cleaned screen has become plugged. To ensure
your safety, prior to the screen housing to repair the nozzle,
you should check - Anwser//A valve which allows water to flow
in one direction only is a ____ valve. cause short circuiting in
affected lagoon - Anwser//Cattails growing in a lagoon will
algae - Anwser//Which of the following forms of plant life is
necessary for the proper functioning of a stabilization or
oxidation pond? 3 p.m. - Anwser//At waht time of day is the
dissolved xoygen content highest in a lagoon? MPN -
Anwser//Results from the Multiple-Tuber Fermentation
Technique for members of the Total Coliform Group are
, expressed as heavier than air - Anwser//Chlorine gas is warm
temperature, moderate breeze and good sunlight -
Anwser//The greatest bacterial activity and the highest BOD5
removal in a waste stabilization lagoon will occur when there is
impeller - Anwser//Centrifugal pump parts include over
lubrication - Anwser//When carrrying out a routine inspection
on a certifugal pump, it is noted by the operator that the
bearings are excessively hot. This could be caused methane -
Anwser//which gas is produced in anaerobic digesters and can
be used as a fuel? Vitrified Clay Pipe - Anwser//Pipe material
that is the least susceptible to corrosion by acids formed from
hydrogen sulfide gas is near top - Anwser//The highest
concentration of algae growth in a lagoon is usually observed
bacteria - Anwser//When organic wastes are discharged to
receiving waters, oxygen is depleted by 1/100,000 -
Anwser//One milliliter is what fraction of a liter? wear rings -
Anwser//In a centrifugal pump, internal leakage is prevented
by keeps gritty material from entering the packing box -
Anwser//A water seal on a pump serves a dual purpose. It acts
as a lubricant and it also disinfect - Anwser//Chlorine is used to
cause chlorine gas to be released - Anwser//Acids should never
be added to chlorine solutions as they representative sample -
Anwser//A composite sample will give an Anything below 7 -
Anwser//Which of these pH readings indicates an acidic
wastewater? (Give a number) indicators - Anwser//Coliform
bacteria are Converting nitrate and nitrite to nitrogen gas -
Anwser//Denitrification is accomplished by composition of the
pipe - Anwser//The three common types of plastic pipes are
listed as: PVC, PE and ABS. These names refer to the at floor
level - Anwser//Exhaust from a chlorinator room should be
taken from To add air to the digester - Anwser//What is the
purpose of a vacuum relief valve on your anaerobic digester? to
increase the digestion rate - Anwser//What is the purpose of
heating and mixing a primary anaerobic digester? brown color
and musty odor - Anwser//Which indicates a good quality
PRACTICE EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS |A+
GRADE
bearing lubrication and connection - Anwser//What does a
gradual increase in the bearing temperature of a centrifugal
blower indicate? detention time - Anwser//The time is takes for
a unit volume of wastewater to pass entirely through a primary
clarifier is called centrifugal - Anwser//Pumps are often
required to bring wastewater into a treatment plant. What
types of pumps are typically used to lift influent wastewater?
typhoid fever, dysentery, cholera - Anwser//Three waterborne
diseases are 2-5 mg/L - Anwser//Conventional activated sludge
systems typically operate with a DO range of: SDS -
Anwser//Which of the following provides safety information for
potentially hazardous or toxic materials? alert the operator on
duty - Anwser//The first step the maintenance staff should take
in properly locking and tagging out a piece of equipment is to:
Denitrification - Anwser//Which of the following would NOT be
considered preliminary treatment? 19.5% - Anwser//Oxygen
deficiency becomes a concern when the oxygen level in a
confined space is less than Air Lift - Anwser//This type of pump
injects compressed air into a discharge line, which mixes and
raises solids through the line due to sludge density. Nitrification
- Anwser//The appearance of duckweed in a final clarifier is an
indication of: Packing - Anwser//This material can be made
from Teflon or graphite and is used to prevent leakage between
moving parts of a pump: make no adjustment - Anwser//What
is the first course of action if you see a slow constant drip from
a pump shaft packing seal? mixed liquor volatile suspended
solids - Anwser//Which of the following types of solids most
,accurately represent the microorganisms in the activated
sludge process? none, it must analyzed immediately -
Anwser//What is the maximum recommended holding time for
a sample that is to be analyzed for pH? Reciprocating -
Anwser//This type of positive displacement pump consists of a
piston that moves back and forth sodium sulfite solution -
Anwser//Most DO probes come with an electronic zero for
calibration. What should be used to check the accuracy of this
feature on a DO probe? secured together - Anwser//When
working in an area with two or more floor coverings (for
example, grating and checker-plate), be sure that they are
always Hydrogen sulfide - Anwser//A rotten egg smell in
wastewater can most likely be attributed to: an area where
conditions are very calm and no mixing is taking place -
Anwser//A "dead" spot in an activated sludge biological reactor
is typically identified visually as bacteria - Anwser//When
organic wastes are discharged to receiving waters, oxygen is
depleted by lock and tag out the equipment - Anwser//When
planning to work on or near electrical equipment, be sure to
always 1.5 hours - Anwser//What would be considered a typical
design detention time for a primary clarifier? Diaphragm -
Anwser//This type positive displacement pump consists of a
reciprocating membrane. Material fills a chamber as the
membrane flexes and gets forced out through a discharge
check valve: Sand - Anwser//Grit is composed mostly of
Indicators - Anwser//Coliform bacteria are Screenings -
Anwser//large debris (sticks, rocks, etc.), large floating solids,
and fibrous materials (rags, strings, cloth, etc.) are categorized
as Centrifugal - Anwser//This type of pump, commonly used to
pump wastewater, may contain open or closed impellers
supported on a shaft. When liquid enters this pump,
mechanical forces convey flow through the discharge: mild,
musty - Anwser//healthy activated sludge has what type of
smell? beaker - Anwser//What piece of lab glassware is used
mainly to mix chemicals and measure approximate volumes?
,ultraviolet radiation - Anwser//After chlorine, what is the most
common effluent wastewater disinfection techniques or agent
used in the U.S. today? annually - Anwser//How often should
the scraper arms and blades of a circular clarifier be inspected
and replaced, if necessary? Settleable solids - Anwser//A
properly designed primary clarifier will remove 90 percent of
which of the following: rotten eggs - Anwser//Hydrogen sulfide
gives off an odor similar to Cavitation - Anwser//This condition
is the result of low pressures within a pump, which creates
coiling water and vapor bubbles. Damage to the impeller can
happen when these vapor bubbles pop: Submersible -
Anwser//In this type of centrifugal pump, the motor is sealed
and closed-coupled to the pump. This pump typically pushes
flow from the bottom of a pit into a discharge line: Parshall
Flume - Anwser//Which of the following is a typical piece of
flow measuring equipment? at the downstream end of the
chlorine contact tank - Anwser//Which of the following is an
appropriate location to collect a final effluent sample for
chlorine residual test? Volumetric Pipette - Anwser//Of the
following, the most precise piece of lab equipment for
measuring liquid would be: notify local police or sheriff -
Anwser//Which of the following would be the safest action to
take in the event of a major chlorine container leak? turn off
and lock motor control - Anwser//A spray nozzle on the
mechanically cleaned screen has become plugged. To ensure
your safety, prior to the screen housing to repair the nozzle,
you should check - Anwser//A valve which allows water to flow
in one direction only is a ____ valve. cause short circuiting in
affected lagoon - Anwser//Cattails growing in a lagoon will
algae - Anwser//Which of the following forms of plant life is
necessary for the proper functioning of a stabilization or
oxidation pond? 3 p.m. - Anwser//At waht time of day is the
dissolved xoygen content highest in a lagoon? MPN -
Anwser//Results from the Multiple-Tuber Fermentation
Technique for members of the Total Coliform Group are
, expressed as heavier than air - Anwser//Chlorine gas is warm
temperature, moderate breeze and good sunlight -
Anwser//The greatest bacterial activity and the highest BOD5
removal in a waste stabilization lagoon will occur when there is
impeller - Anwser//Centrifugal pump parts include over
lubrication - Anwser//When carrrying out a routine inspection
on a certifugal pump, it is noted by the operator that the
bearings are excessively hot. This could be caused methane -
Anwser//which gas is produced in anaerobic digesters and can
be used as a fuel? Vitrified Clay Pipe - Anwser//Pipe material
that is the least susceptible to corrosion by acids formed from
hydrogen sulfide gas is near top - Anwser//The highest
concentration of algae growth in a lagoon is usually observed
bacteria - Anwser//When organic wastes are discharged to
receiving waters, oxygen is depleted by 1/100,000 -
Anwser//One milliliter is what fraction of a liter? wear rings -
Anwser//In a centrifugal pump, internal leakage is prevented
by keeps gritty material from entering the packing box -
Anwser//A water seal on a pump serves a dual purpose. It acts
as a lubricant and it also disinfect - Anwser//Chlorine is used to
cause chlorine gas to be released - Anwser//Acids should never
be added to chlorine solutions as they representative sample -
Anwser//A composite sample will give an Anything below 7 -
Anwser//Which of these pH readings indicates an acidic
wastewater? (Give a number) indicators - Anwser//Coliform
bacteria are Converting nitrate and nitrite to nitrogen gas -
Anwser//Denitrification is accomplished by composition of the
pipe - Anwser//The three common types of plastic pipes are
listed as: PVC, PE and ABS. These names refer to the at floor
level - Anwser//Exhaust from a chlorinator room should be
taken from To add air to the digester - Anwser//What is the
purpose of a vacuum relief valve on your anaerobic digester? to
increase the digestion rate - Anwser//What is the purpose of
heating and mixing a primary anaerobic digester? brown color
and musty odor - Anwser//Which indicates a good quality
