Texas Wastewater Class A 2025/2026
Exam Questions and Answers | A+ Score
Assured
Seeding of BOD samples is necessary when samples - 🧠 ANSWER ✔✔(All
of the above) have a chlorine residual, have a previously been chlorinated,
have been subjected to high temperatures, contain high or low pH industrial
wastes
When is blue-green algae the most dominant on a pond treatment system?
- 🧠 ANSWER ✔✔Summer
A 30-inch diameter wastewater 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 - 🧠
ANSWER ✔✔c. 2,200 gallons per minute
,A one-cylinder reciprocating sludge 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 - 🧠
ANSWER ✔✔60 minutes
If an existing centrifugal pump motor 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 - 🧠 ANSWER ✔✔95 percent
When must TCEQ be notified about expansions of a treatment facility? - 🧠
ANSWER ✔✔Before construction
In an anaerobic digester, the percentage of methane and carbon dioxide
gas content should be - 🧠 ANSWER ✔✔70% methane, 30% carbon dioxide
The temperature of an anaerobic digester should be maintained at a
minimum of - 🧠 ANSWER ✔✔95° F
What type of wastewater treatment operates in the endogenous bacteria
growth phase? - 🧠 ANSWER ✔✔Extended air
,Why is recirculation needed in a trickling filter? - 🧠 ANSWER ✔✔Keep the
media wet Further reduce BOD All of the above (a, b, and c)
What type of fire extinguisher would be used on an electrical control panel
that has been de-energized? - 🧠 ANSWER ✔✔Class A Class C (a and d)
Disinfection with chlorine is the most effective at a pH of - 🧠 ANSWER
✔✔6.0
The biomass on a normal functioning RBC has what appearance? - 🧠
ANSWER ✔✔Grey to brown and 0.05 to 0.1 inch thick
The sludge from a primary clarifier should percent solids? - 🧠 ANSWER
✔✔4% to 6%
What is eutrophication in a pond system? - 🧠 ANSWER ✔✔Enrichment with
nitrogen and phosphorous Causes algae blooms (b and c)
How often should pH meters be calibrated? - 🧠 ANSWER ✔✔Daily
In Texas, pH meters are required to be calibrated on how many buffers? - 🧠
ANSWER ✔✔two
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, An industrial complex has a BOD 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 - 🧠 ANSWER ✔✔2941
The parameters of the BOD test are - 🧠 ANSWER ✔✔5 days at 20°
Centigrade
Standard Dimension Ratio in pvc pipe is defined as - 🧠 ANSWER ✔✔Ratio
of OD pipe diameter to wall thickness
How should shoring be removed from a trench? - 🧠 ANSWER ✔✔up from
the bottom up
In low pressure sewer systems where each tap must have a grinder pump
lift station, station is considered to be - 🧠 ANSWER ✔✔part of the collection
system and the responsibility of the utility
Effective communication depends on - 🧠 ANSWER ✔✔being a good
listener
When designing a wastewater collection system, the engineer considers
the population for how many years in the future? - 🧠 ANSWER ✔✔50
Exam Questions and Answers | A+ Score
Assured
Seeding of BOD samples is necessary when samples - 🧠 ANSWER ✔✔(All
of the above) have a chlorine residual, have a previously been chlorinated,
have been subjected to high temperatures, contain high or low pH industrial
wastes
When is blue-green algae the most dominant on a pond treatment system?
- 🧠 ANSWER ✔✔Summer
A 30-inch diameter wastewater 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 - 🧠
ANSWER ✔✔c. 2,200 gallons per minute
,A one-cylinder reciprocating sludge 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 - 🧠
ANSWER ✔✔60 minutes
If an existing centrifugal pump motor 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 - 🧠 ANSWER ✔✔95 percent
When must TCEQ be notified about expansions of a treatment facility? - 🧠
ANSWER ✔✔Before construction
In an anaerobic digester, the percentage of methane and carbon dioxide
gas content should be - 🧠 ANSWER ✔✔70% methane, 30% carbon dioxide
The temperature of an anaerobic digester should be maintained at a
minimum of - 🧠 ANSWER ✔✔95° F
What type of wastewater treatment operates in the endogenous bacteria
growth phase? - 🧠 ANSWER ✔✔Extended air
,Why is recirculation needed in a trickling filter? - 🧠 ANSWER ✔✔Keep the
media wet Further reduce BOD All of the above (a, b, and c)
What type of fire extinguisher would be used on an electrical control panel
that has been de-energized? - 🧠 ANSWER ✔✔Class A Class C (a and d)
Disinfection with chlorine is the most effective at a pH of - 🧠 ANSWER
✔✔6.0
The biomass on a normal functioning RBC has what appearance? - 🧠
ANSWER ✔✔Grey to brown and 0.05 to 0.1 inch thick
The sludge from a primary clarifier should percent solids? - 🧠 ANSWER
✔✔4% to 6%
What is eutrophication in a pond system? - 🧠 ANSWER ✔✔Enrichment with
nitrogen and phosphorous Causes algae blooms (b and c)
How often should pH meters be calibrated? - 🧠 ANSWER ✔✔Daily
In Texas, pH meters are required to be calibrated on how many buffers? - 🧠
ANSWER ✔✔two
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, An industrial complex has a BOD 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 - 🧠 ANSWER ✔✔2941
The parameters of the BOD test are - 🧠 ANSWER ✔✔5 days at 20°
Centigrade
Standard Dimension Ratio in pvc pipe is defined as - 🧠 ANSWER ✔✔Ratio
of OD pipe diameter to wall thickness
How should shoring be removed from a trench? - 🧠 ANSWER ✔✔up from
the bottom up
In low pressure sewer systems where each tap must have a grinder pump
lift station, station is considered to be - 🧠 ANSWER ✔✔part of the collection
system and the responsibility of the utility
Effective communication depends on - 🧠 ANSWER ✔✔being a good
listener
When designing a wastewater collection system, the engineer considers
the population for how many years in the future? - 🧠 ANSWER ✔✔50
