Texas Wastewater Class A Test Questions and Answers Rated A
(All of the above) have a chlorine residual, have a pre-
Seeding of BOD samples is necessary when samples viously 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
Summer
treatment system?
A 30-inch diameter wastewater interceptor is observed to
be flowing half-full at about two fps. The approximate vol-
c. 2,200 gallons per minute
ume 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 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
60 minutes
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 pump motor is replaced with a
motor with 25 percent more speed, the motor horsepow- 95 percent
er required will increase by 1.25 x 1.25 x 1.25 = 1.95
When must TCEQ be notified about expansions of a treat-
Before construction
ment facility?
In an anaerobic digester, the percentage of methane and
70% methane, 30% carbon dioxide
carbon dioxide gas content should be
The temperature of an anaerobic digester should be
95° F
maintained at a minimum of
What type of wastewater treatment operates in the en-
Extended air
dogenous bacteria growth phase?
Keep the media wet Further reduce BOD All of the above
Why is recirculation needed in a trickling filter?
(a, b, and c)
, Texas Wastewater Class A Test Questions and Answers Rated A
What type of fire extinguisher would be used on an elec-
Class A Class C (a and d)
trical control panel that has been de-energized?
Disinfection with chlorine is the most ettective at a pH of 6.0
The biomass on a normal functioning RBC has what ap-
Grey to brown and 0.05 to 0.1 inch thick
pearance?
The sludge from a primary clarifier should percent solids? 4% to 6%
Enrichment with nitrogen and phosphorous Causes algae
What is eutrophication in a pond system?
blooms (b and c)
How often should pH meters be calibrated? Daily
In Texas, pH meters are required to be calibrated on how
two
many butters?
An industrial complex has a BOD discharge to the POTW
of 500 pounds per day. The population equivalent of this 2941
industry is 500 lbs = 2,941 0.17 lbs BOD person
The parameters of the BOD test are 5 days at 20° Centigrade
Standard Dimension Ratio in pvc pipe is defined as Ratio of OD pipe diameter to wall thickness
How should shoring be removed from a trench? up from the bottom up
In low pressure sewer systems where each tap must have part of the collection system and the responsibility of the
a grinder pump lift station, station is considered to be utility
Ettective communication depends on being a good listener
When designing a wastewater collection system, the en-
gineer considers the population for how many years in 50
the future?
According to 30 TAC Chapter 317, all pipe and fittings used
in wastewater pressure shall have a minimum psi pressure 150
rating of
, Texas Wastewater Class A Test Questions and Answers Rated A
The minimum velocity of flow in a wastewater line should
2.0 fps
be
At a construction job site, as the roadway speed increases,
increase
the spacing between cones and barricades should
The major cause of wastewater line stoppages is roots and grease
tightness in the chest nausea drowsiness and headache
Carbon monoxide (CO) poisoning symptoms are
(all of the above)
The smallest pipe size for air recirculation of a self-priming
1 inch
centrifugal pump is
some gases have no odor some gases may deaden the
Dangerous gases in a confined space may not be detected
sense of smell some gases may displace the oxygen (all
with the physical senses because
of the above)
What are the dangerous gases a collection system worker
CO2 CO НaS CH4 (all of the above)
might come into contact with?
On a construction job site, equipment booms must main-
tain at least how many feet of clearance from overhead 10
electric lines?
How should trench shoring be installed? to above the top of the trench
When setting work goals for an employee, the goals
accompanied by an action plan
should be
According to Chapter 317, Design Criteria, a manhole can the manhole is completely watertight and tested for no
be installed within 9 feet of an existing waterline if leakage
As the population of a collection system increases, the
decrease
ratio of peak flow to average daily flow will
Motivating workers to do a better job is best done by letting workers participate in setting goals
One important element of a good communicator is being a good listener
d. three years
(All of the above) have a chlorine residual, have a pre-
Seeding of BOD samples is necessary when samples viously 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
Summer
treatment system?
A 30-inch diameter wastewater interceptor is observed to
be flowing half-full at about two fps. The approximate vol-
c. 2,200 gallons per minute
ume 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 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
60 minutes
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 pump motor is replaced with a
motor with 25 percent more speed, the motor horsepow- 95 percent
er required will increase by 1.25 x 1.25 x 1.25 = 1.95
When must TCEQ be notified about expansions of a treat-
Before construction
ment facility?
In an anaerobic digester, the percentage of methane and
70% methane, 30% carbon dioxide
carbon dioxide gas content should be
The temperature of an anaerobic digester should be
95° F
maintained at a minimum of
What type of wastewater treatment operates in the en-
Extended air
dogenous bacteria growth phase?
Keep the media wet Further reduce BOD All of the above
Why is recirculation needed in a trickling filter?
(a, b, and c)
, Texas Wastewater Class A Test Questions and Answers Rated A
What type of fire extinguisher would be used on an elec-
Class A Class C (a and d)
trical control panel that has been de-energized?
Disinfection with chlorine is the most ettective at a pH of 6.0
The biomass on a normal functioning RBC has what ap-
Grey to brown and 0.05 to 0.1 inch thick
pearance?
The sludge from a primary clarifier should percent solids? 4% to 6%
Enrichment with nitrogen and phosphorous Causes algae
What is eutrophication in a pond system?
blooms (b and c)
How often should pH meters be calibrated? Daily
In Texas, pH meters are required to be calibrated on how
two
many butters?
An industrial complex has a BOD discharge to the POTW
of 500 pounds per day. The population equivalent of this 2941
industry is 500 lbs = 2,941 0.17 lbs BOD person
The parameters of the BOD test are 5 days at 20° Centigrade
Standard Dimension Ratio in pvc pipe is defined as Ratio of OD pipe diameter to wall thickness
How should shoring be removed from a trench? up from the bottom up
In low pressure sewer systems where each tap must have part of the collection system and the responsibility of the
a grinder pump lift station, station is considered to be utility
Ettective communication depends on being a good listener
When designing a wastewater collection system, the en-
gineer considers the population for how many years in 50
the future?
According to 30 TAC Chapter 317, all pipe and fittings used
in wastewater pressure shall have a minimum psi pressure 150
rating of
, Texas Wastewater Class A Test Questions and Answers Rated A
The minimum velocity of flow in a wastewater line should
2.0 fps
be
At a construction job site, as the roadway speed increases,
increase
the spacing between cones and barricades should
The major cause of wastewater line stoppages is roots and grease
tightness in the chest nausea drowsiness and headache
Carbon monoxide (CO) poisoning symptoms are
(all of the above)
The smallest pipe size for air recirculation of a self-priming
1 inch
centrifugal pump is
some gases have no odor some gases may deaden the
Dangerous gases in a confined space may not be detected
sense of smell some gases may displace the oxygen (all
with the physical senses because
of the above)
What are the dangerous gases a collection system worker
CO2 CO НaS CH4 (all of the above)
might come into contact with?
On a construction job site, equipment booms must main-
tain at least how many feet of clearance from overhead 10
electric lines?
How should trench shoring be installed? to above the top of the trench
When setting work goals for an employee, the goals
accompanied by an action plan
should be
According to Chapter 317, Design Criteria, a manhole can the manhole is completely watertight and tested for no
be installed within 9 feet of an existing waterline if leakage
As the population of a collection system increases, the
decrease
ratio of peak flow to average daily flow will
Motivating workers to do a better job is best done by letting workers participate in setting goals
One important element of a good communicator is being a good listener
d. three years
