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Texas Wastewater Class A Exam (Latest 2026/2027 Update) Questions and Verified Answers| 100% Correct | Grade A
Texas Wastewater Class A Exam (Latest
2026/2027 Update) Questions and Verified
Answers| 100% Correct | Grade A
Q: The sludge from a primary clarifier should percent solids?
Answer:
4% to 6%
Q: What is eutrophication in a pond system?
Answer:
Enrichment with nitrogen and phosphorous Causes algae blooms (b and c)
Q: How often should pH meters be calibrated?
Answer:
Daily
Q: In Texas, pH meters are required to be calibrated on how many buffers?
Answer:
two
Q: 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
Q: The parameters of the BOD test are
Answer:
5 days at 20° Centigrade
Q: Standard Dimension Ratio in pvc pipe is defined as
Answer:
Ratio of OD pipe diameter to wall thickness
Q: How should shoring be removed from a trench?
Answer:
up from the bottom up
Q: 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
Q: Effective communication depends on
Answer:
being a good listener
Q: When designing a wastewater collection system, the engineer considers the population for
how many years in the future?
Answer:
50
Q: According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure shall
have a minimum psi pressure rating of
Answer:
150
Q: The minimum velocity of flow in a wastewater line should be
Answer:
2.0 fps
Q: At a construction job site, as the roadway speed increases, the spacing between cones and
barricades should
Answer:
increase
Q: The major cause of wastewater line stoppages is
Answer:
roots and grease
Q: Carbon monoxide (CO) poisoning symptoms are
Answer:
tightness in the chest nausea drowsiness and headache (all of the above)
Q: The smallest pipe size for air recirculation of a self-priming centrifugal pump is
Answer:
1 inch
Q: Dangerous gases in a confined space may not be detected with the physical senses because
Answer:
some gases have no odor some gases may deaden the sense of smell some gases may displace the
oxygen (all of the above)
Q: What are the dangerous gases a collection system worker might come into contact with?
Answer:
CO2 CO ÐaS CH4 (all of the above)
Q: On a construction job site, equipment booms must maintain at least how many feet of
clearance from overhead electric lines?
Answer:
10
Q: How should trench shoring be installed?
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