3/20/26, 2:38 PM Texas Wastewater Class A Exam comprehensive questions fully solved & updated (Latest Update 2026) UPDATE!! Flashcards | Qu…
Texas Wastewater Class A Exam comprehensive
questions fully solved & updated (Latest Update
2026) UPDATE!!
Save
Terms in this set (194)
Seeding of BOD samples is (All of the above) have a chlorine residual, have a
necessary when samples previously been chlorinated, have been subjected
to high temperatures, contain high or low pH
industrial wastes
When is blue-green algae the most Summer
dominant on a pond treatment
system?
A 30-inch diameter wastewater c. 2,200 gallons per minute
interceptor is observed to be flowing
half-full at about two fps. The
approximate volume of wastewater
flowing through the pipe is 3.14x1.25
x 1.25 x 2 = 4.9 cfs x 449 = 2,200 gpm
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,3/20/26, 2:38 PM Texas Wastewater Class A Exam comprehensive questions fully solved & updated (Latest Update 2026) UPDATE!! Flashcards | Qu…
A one-cylinder reciprocating sludge 60 minutes
pump with a 10-inch bore and a 5-
inch stroke pumps at a rate of 50
cycles per minute. How many
minutes must the pump be operated
to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 =
84.5 gpm 5000 gal = 59,2min 84.5
gpm b. 29
If an existing centrifugal pump motor 95 percent
is replaced with a motor with 25
percent more speed, the motor
horsepower required will increase by
1.25 x 1.25 x 1.25 = 1.95
When must TCEQ be notified about Before construction
expansions of a treatment facility?
In an anaerobic digester, the 70% methane, 30% carbon dioxide
percentage of methane and carbon
dioxide gas content should be
The temperature of an anaerobic 95° F
digester should be maintained at a
minimum of
What type of wastewater treatment Extended air
operates in the endogenous bacteria
growth phase?
Why is recirculation needed in a Keep the media wet Further reduce BOD All of the
trickling filter? above (a, b, and c)
https://quizlet.com/1158296666/texas-wastewater-class-a-exam-comprehensive-questions-fully-solved-updated-latest-update-2026-update-flash-card… 2/26
, 3/20/26, 2:38 PM Texas Wastewater Class A Exam comprehensive questions fully solved & updated (Latest Update 2026) UPDATE!! Flashcards | Qu…
What type of fire extinguisher would Class A Class C (a and d)
be used on an electrical control
panel that has been de-energized?
Disinfection with chlorine is the most 6.0
effective at a pH of
The biomass on a normal functioning Grey to brown and 0.05 to 0.1 inch thick
RBC has what appearance?
The sludge from a primary clarifier 4% to 6%
should percent solids?
What is eutrophication in a pond Enrichment with nitrogen and phosphorous Causes
system? algae blooms (b and c)
How often should pH meters be Daily
calibrated?
In Texas, pH meters are required to two
be calibrated on how many buffers?
An industrial complex has a BOD 2941
discharge to the POTW of 500
pounds per day. The population
equivalent of this industry is 500 lbs =
2,941 0.17 lbs BOD person
The parameters of the BOD test are 5 days at 20° Centigrade
Standard Dimension Ratio in pvc Ratio of OD pipe diameter to wall thickness
pipe is defined as
https://quizlet.com/1158296666/texas-wastewater-class-a-exam-comprehensive-questions-fully-solved-updated-latest-update-2026-update-flash-card… 3/26
Texas Wastewater Class A Exam comprehensive
questions fully solved & updated (Latest Update
2026) UPDATE!!
Save
Terms in this set (194)
Seeding of BOD samples is (All of the above) have a chlorine residual, have a
necessary when samples previously been chlorinated, have been subjected
to high temperatures, contain high or low pH
industrial wastes
When is blue-green algae the most Summer
dominant on a pond treatment
system?
A 30-inch diameter wastewater c. 2,200 gallons per minute
interceptor is observed to be flowing
half-full at about two fps. The
approximate volume of wastewater
flowing through the pipe is 3.14x1.25
x 1.25 x 2 = 4.9 cfs x 449 = 2,200 gpm
https://quizlet.com/1158296666/texas-wastewater-class-a-exam-comprehensive-questions-fully-solved-updated-latest-update-2026-update-flash-card… 1/26
,3/20/26, 2:38 PM Texas Wastewater Class A Exam comprehensive questions fully solved & updated (Latest Update 2026) UPDATE!! Flashcards | Qu…
A one-cylinder reciprocating sludge 60 minutes
pump with a 10-inch bore and a 5-
inch stroke pumps at a rate of 50
cycles per minute. How many
minutes must the pump be operated
to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 =
84.5 gpm 5000 gal = 59,2min 84.5
gpm b. 29
If an existing centrifugal pump motor 95 percent
is replaced with a motor with 25
percent more speed, the motor
horsepower required will increase by
1.25 x 1.25 x 1.25 = 1.95
When must TCEQ be notified about Before construction
expansions of a treatment facility?
In an anaerobic digester, the 70% methane, 30% carbon dioxide
percentage of methane and carbon
dioxide gas content should be
The temperature of an anaerobic 95° F
digester should be maintained at a
minimum of
What type of wastewater treatment Extended air
operates in the endogenous bacteria
growth phase?
Why is recirculation needed in a Keep the media wet Further reduce BOD All of the
trickling filter? above (a, b, and c)
https://quizlet.com/1158296666/texas-wastewater-class-a-exam-comprehensive-questions-fully-solved-updated-latest-update-2026-update-flash-card… 2/26
, 3/20/26, 2:38 PM Texas Wastewater Class A Exam comprehensive questions fully solved & updated (Latest Update 2026) UPDATE!! Flashcards | Qu…
What type of fire extinguisher would Class A Class C (a and d)
be used on an electrical control
panel that has been de-energized?
Disinfection with chlorine is the most 6.0
effective at a pH of
The biomass on a normal functioning Grey to brown and 0.05 to 0.1 inch thick
RBC has what appearance?
The sludge from a primary clarifier 4% to 6%
should percent solids?
What is eutrophication in a pond Enrichment with nitrogen and phosphorous Causes
system? algae blooms (b and c)
How often should pH meters be Daily
calibrated?
In Texas, pH meters are required to two
be calibrated on how many buffers?
An industrial complex has a BOD 2941
discharge to the POTW of 500
pounds per day. The population
equivalent of this industry is 500 lbs =
2,941 0.17 lbs BOD person
The parameters of the BOD test are 5 days at 20° Centigrade
Standard Dimension Ratio in pvc Ratio of OD pipe diameter to wall thickness
pipe is defined as
https://quizlet.com/1158296666/texas-wastewater-class-a-exam-comprehensive-questions-fully-solved-updated-latest-update-2026-update-flash-card… 3/26
