TEXAS WASTEWATER CLASS A EXAM | ALL QUESTIONS AND CORRECT AN
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
1. Seeding of BOD samples is necessary when samples (All of the above) have
a chlorine residual, have
a previously been chlori-
nated, have been subject-
ed to high temperatures,
contain high or low pH in-
dustrial wastes
2. When is blue-green algae the most dominant on a Summer
pond treatment system?
3. A 30-inch diameter wastewater interceptor is ob- c. 2,200 gallons per
served to be flowing half-full at about two fps. The minute
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
4. A one-cylinder reciprocating sludge pump with a 60 minutes
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
5. If an existing centrifugal pump motor is replaced with 95 percent
a motor with 25 percent more speed, the motor horse-
power required will increase by 1.25 x 1.25 x 1.25 =
1.95
6. When must TCEQ be notified about expansions of a Before construction
treatment facility?
, TEXAS WASTEWATER CLASS A EXAM | ALL QUESTIONS AND CORRECT AN
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
7. In an anaerobic digester, the percentage of methane 70% methane, 30% car-
and carbon dioxide gas content should be bon dioxide
8. The temperature of an anaerobic digester should be 95° F
maintained at a minimum of
9. What type of wastewater treatment operates in the Extended air
endogenous bacteria growth phase?
10. Why is recirculation needed in a trickling filter? Keep the media wet Fur-
ther reduce BOD All of the
above (a, b, and c)
11. What type of fire extinguisher would be used on an Class A Class C (a and d)
electrical control panel that has been de-energized?
12. Disinfection with chlorine is the most effective at a pH 6.0
of
13. The biomass on a normal functioning RBC has what Grey to brown and 0.05 to
appearance? 0.1 inch thick
14. The sludge from a primary clarifier should percent 4% to 6%
solids?
15. What is eutrophication in a pond system? Enrichment with nitrogen
and phosphorous Causes
algae blooms (b and c)
16. How often should pH meters be calibrated? Daily
17. In Texas, pH meters are required to be calibrated on two
how many buffers?
, TEXAS WASTEWATER CLASS A EXAM | ALL QUESTIONS AND CORRECT AN
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
18. An industrial complex has a BOD discharge to the 2941
POTW of 500 pounds per day. The population equiv-
alent of this industry is 500 lbs = 2,941 0.17 lbs BOD
person
19. The parameters of the BOD test are 5 days at 20° Centigrade
20. Standard Dimension Ratio in pvc pipe is defined as Ratio of OD pipe diameter
to wall thickness
21. How should shoring be removed from a trench? up from the bottom up
22. In low pressure sewer systems where each tap must part of the collection sys-
have a grinder pump lift station, station is considered tem and the responsibility
to be of the utility
23. Effective communication depends on being a good listener
24. When designing a wastewater collection system, the 50
engineer considers the population for how many
years in the future?
25. According to 30 TAC Chapter 317, all pipe and fittings 150
used in wastewater pressure shall have a minimum
psi pressure rating of
26. The minimum velocity of flow in a wastewater line 2.0 fps
should be
27. At a construction job site, as the roadway speed in- increase
creases, the spacing between cones and barricades
should
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
1. Seeding of BOD samples is necessary when samples (All of the above) have
a chlorine residual, have
a previously been chlori-
nated, have been subject-
ed to high temperatures,
contain high or low pH in-
dustrial wastes
2. When is blue-green algae the most dominant on a Summer
pond treatment system?
3. A 30-inch diameter wastewater interceptor is ob- c. 2,200 gallons per
served to be flowing half-full at about two fps. The minute
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
4. A one-cylinder reciprocating sludge pump with a 60 minutes
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
5. If an existing centrifugal pump motor is replaced with 95 percent
a motor with 25 percent more speed, the motor horse-
power required will increase by 1.25 x 1.25 x 1.25 =
1.95
6. When must TCEQ be notified about expansions of a Before construction
treatment facility?
, TEXAS WASTEWATER CLASS A EXAM | ALL QUESTIONS AND CORRECT AN
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
7. In an anaerobic digester, the percentage of methane 70% methane, 30% car-
and carbon dioxide gas content should be bon dioxide
8. The temperature of an anaerobic digester should be 95° F
maintained at a minimum of
9. What type of wastewater treatment operates in the Extended air
endogenous bacteria growth phase?
10. Why is recirculation needed in a trickling filter? Keep the media wet Fur-
ther reduce BOD All of the
above (a, b, and c)
11. What type of fire extinguisher would be used on an Class A Class C (a and d)
electrical control panel that has been de-energized?
12. Disinfection with chlorine is the most effective at a pH 6.0
of
13. The biomass on a normal functioning RBC has what Grey to brown and 0.05 to
appearance? 0.1 inch thick
14. The sludge from a primary clarifier should percent 4% to 6%
solids?
15. What is eutrophication in a pond system? Enrichment with nitrogen
and phosphorous Causes
algae blooms (b and c)
16. How often should pH meters be calibrated? Daily
17. In Texas, pH meters are required to be calibrated on two
how many buffers?
, TEXAS WASTEWATER CLASS A EXAM | ALL QUESTIONS AND CORRECT AN
SWERS | ALREADY GRADED A+ | VERIFIED ANSWERS | LATEST VERSION
Study online at https://quizlet.com/_gimrpa
18. An industrial complex has a BOD discharge to the 2941
POTW of 500 pounds per day. The population equiv-
alent of this industry is 500 lbs = 2,941 0.17 lbs BOD
person
19. The parameters of the BOD test are 5 days at 20° Centigrade
20. Standard Dimension Ratio in pvc pipe is defined as Ratio of OD pipe diameter
to wall thickness
21. How should shoring be removed from a trench? up from the bottom up
22. In low pressure sewer systems where each tap must part of the collection sys-
have a grinder pump lift station, station is considered tem and the responsibility
to be of the utility
23. Effective communication depends on being a good listener
24. When designing a wastewater collection system, the 50
engineer considers the population for how many
years in the future?
25. According to 30 TAC Chapter 317, all pipe and fittings 150
used in wastewater pressure shall have a minimum
psi pressure rating of
26. The minimum velocity of flow in a wastewater line 2.0 fps
should be
27. At a construction job site, as the roadway speed in- increase
creases, the spacing between cones and barricades
should
