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TEXAS WASTEWATER CLASS A NEWEST ACTUAL
EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+ 2026
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
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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
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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
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
TEXAS WASTEWATER CLASS A NEWEST ACTUAL
EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+ 2026
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
,2|Page
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
, 3|Page
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
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
