TEXAS WASTEWATER CLASS A EXAM
VERSION A AND B COMPLETE 190+ QUESTIONS
WITH DETAILED VERIFIED ANSWERS / ALREADY
GRADED A / 2025-2026.
Terms in this set (194)
Seeding of BOD samples is (All of the above) have a chlorine residual, have a previously
necessary when samples been chlorinated, have been subjected to high temperatures,
contain high or low pH industrial wastes
When is blue-green algae the Summer
most dominant on a pond
treatment system?
A 30-inch diameter c. 2,200 gallons per minute
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
,A one-cylinder reciprocating 60 minutes
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
If an existing centrifugal 95 percent
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
When must TCEQ be notified Before construction
about 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
95° F
The temperature of an
anaerobic digester should be
maintained at a minimum of
, What type of wastewater Extended air
treatment operates in the
endogenous bacteria growth
phase?
Why is recirculation needed Keep the media wet Further reduce BOD All of the above (a, b,
in a trickling filter? and c)
What type of fire Class A Class C (a and d)
extinguisher would be
used on an electrical
control panel that has
been de-energized?
Disinfection with chlorine is 6.0
the most effective at a
pH of
The biomass on a normal Grey to brown and 0.05 to 0.1 inch thick
functioning RBC has what
appearance?
The sludge from a primary 4% to 6%
clarifier should percent
solids?
What is eutrophication in a Enrichment with nitrogen and phosphorous Causes algae
pond system? blooms (b and c)
How often should pH meters Daily
be calibrated?
two
In Texas, pH meters are
required to be calibrated on
how many buffers?
VERSION A AND B COMPLETE 190+ QUESTIONS
WITH DETAILED VERIFIED ANSWERS / ALREADY
GRADED A / 2025-2026.
Terms in this set (194)
Seeding of BOD samples is (All of the above) have a chlorine residual, have a previously
necessary when samples been chlorinated, have been subjected to high temperatures,
contain high or low pH industrial wastes
When is blue-green algae the Summer
most dominant on a pond
treatment system?
A 30-inch diameter c. 2,200 gallons per minute
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
,A one-cylinder reciprocating 60 minutes
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
If an existing centrifugal 95 percent
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
When must TCEQ be notified Before construction
about 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
95° F
The temperature of an
anaerobic digester should be
maintained at a minimum of
, What type of wastewater Extended air
treatment operates in the
endogenous bacteria growth
phase?
Why is recirculation needed Keep the media wet Further reduce BOD All of the above (a, b,
in a trickling filter? and c)
What type of fire Class A Class C (a and d)
extinguisher would be
used on an electrical
control panel that has
been de-energized?
Disinfection with chlorine is 6.0
the most effective at a
pH of
The biomass on a normal Grey to brown and 0.05 to 0.1 inch thick
functioning RBC has what
appearance?
The sludge from a primary 4% to 6%
clarifier should percent
solids?
What is eutrophication in a Enrichment with nitrogen and phosphorous Causes algae
pond system? blooms (b and c)
How often should pH meters Daily
be calibrated?
two
In Texas, pH meters are
required to be calibrated on
how many buffers?
