TEXAS WASTEWATER EXAMINATION LATEST 2025
WITH ACTUAL QUESTIONS AND CORRECT
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Seeding of BOD samples is necessary when samples - CORRECT 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? -
CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT ANSWER-95 percent
When must TCEQ be notified about expansions of a treatment facility? -
CORRECT ANSWER-Before construction
In an anaerobic digester, the percentage of methane and carbon dioxide gas
content should be - CORRECT ANSWER-70% methane, 30% carbon dioxide
The temperature of an anaerobic digester should be maintained at a minimum
of - CORRECT ANSWER-95° F
What type of wastewater treatment operates in the endogenous bacteria
growth phase? - CORRECT ANSWER-Extended air
Why is recirculation needed in a trickling filter? - CORRECT 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? - CORRECT ANSWER-Class A Class C (a and d)
Disinfection with chlorine is the most effective at a pH of - CORRECT
ANSWER-6.0
The biomass on a normal functioning RBC has what appearance? - CORRECT
ANSWER-Grey to brown and 0.05 to 0.1 inch thick
,The sludge from a primary clarifier should percent solids? - CORRECT
ANSWER-4% to 6%
What is eutrophication in a pond system? - CORRECT ANSWER-Enrichment
with nitrogen and phosphorous Causes algae blooms (b and c)
How often should pH meters be calibrated? - CORRECT ANSWER-Daily
In Texas, pH meters are required to be calibrated on how many buffers? -
CORRECT 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 - CORRECT ANSWER-2941
The parameters of the BOD test are - CORRECT ANSWER-5 days at 20°
Centigrade
Standard Dimension Ratio in pvc pipe is defined as - CORRECT ANSWER-Ratio
of OD pipe diameter to wall thickness
How should shoring be removed from a trench? - CORRECT 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 - CORRECT ANSWER-part of the collection
system and the responsibility of the utility
, Effective communication depends on - CORRECT ANSWER-being a good
listener
When designing a wastewater collection system, the engineer considers the
population for how many years in the future? - CORRECT ANSWER-50
According to 30 TAC Chapter 317, all pipe and fittings used in wastewater
pressure shall have a minimum psi pressure rating of - CORRECT ANSWER-
150
The minimum velocity of flow in a wastewater line should be - CORRECT
ANSWER-2.0 fps
At a construction job site, as the roadway speed increases, the spacing
between cones and barricades should - CORRECT ANSWER-increase
The major cause of wastewater line stoppages is - CORRECT ANSWER-roots
and grease
Carbon monoxide (CO) poisoning symptoms are - CORRECT ANSWER-
tightness in the chest nausea drowsiness and headache (all of the above)
The smallest pipe size for air recirculation of a self-priming centrifugal pump is -
CORRECT ANSWER-1 inch
Dangerous gases in a confined space may not be detected with the physical
senses because - CORRECT ANSWER-some gases have no odor some gases
may deaden the sense of smell some gases may displace the oxygen (all of the
above)
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