TEXAS WASTEWATER CLASS A,B, C AND CLASS D BUNDLE
NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS
Ponding on a trickling filter is caused by _______________.
a. excessive zoogleal growth
b. improper media
c. poor primary treatment
d. all listed - ANSWER: All listed
Pounds per day of BOD per acre-feet or 1000 cubic feet of media. - ANSWER: Organic
loading
An ultrasonic flow monitoring device works on the principle of _________. -
ANSWER: Sonar
The primary causes of wastewater stoppages are ______________. - ANSWER: Roots
and grease
pH scale measures from - ANSWER: 0 to 14
An administrative penalty for discharge violations can be up to _________ per day. -
ANSWER: $10,000
When chlorine is used, the effective disinfectant is ______________.
a. HCl
b. HOCl
c. H2SO4
d. H2S - ANSWER: HOCl (hypochlorous acid)
One surface acre of pond provides treatment for about _________ people. -
ANSWER: 300
When sludge in an Imhoff tank is near ___ inches of the slot, withdraw sludge. -
ANSWER: 18
A weir is an obstruction placed in a channel causing the water to _________.
a. back up
b. pressurize
c. evaporate
d. run off - ANSWER: back up
The most important problem prevented by monitoring or restricting industrial waste
is ____________.
a. sludge contamination
,b. worker exposure
c. effluent pollutants
d. sewer fires - ANSWER: b. worker exposure
All answers are correct, but this is the best.
Safety first.
The primary purpose of returning sludge in the activated sludge process is to have
enough _________ in the aeration basin to match the food supply.
a. water
b. microorganisms
c. BOD
d. DO - ANSWER: b. microorganisms
A simple method of determining when to waste from an activated sludge plant is the
______________.
a. sludge volume index
b. mixed liquor suspended solids
c. 30 minute settling test
d. F/M ratio - ANSWER: c. 30 minute settling test
All answers are correct. 30 minute settle is the simplest method and best answer.
Imhoff tanks are _______ story units with ________ compartments. - ANSWER: 2
story; 3 compartments
Aerobic digestion is an _____________ process whereby the aerobic bacteria
consume themselves.
a. endothermic
b. endangered
c. endogenous
d.endemic - ANSWER: c. endogenous
Gas chlorinator feed rates are indicated by the _____________ in pounds per day.
a. residual
b. injector
c. rotameter
d. controller - ANSWER: c. rotameter
Minimum acceptable velocity in a gravity wastewater line - ANSWER: 2 feet per
second
Septic wastewater
a. is gray in color with a slight fecal odor.
b. is black in color and has very little odor.
c. is the result of bacterial decomposition in the absence of oxygen
d. has dissolved oxygen present with visible floating solids - ANSWER: c. is the result
of bacterial decomposition in the absence of oxygen.
It is black in color, but with a disagreeable odor.
, A contact stabilization activated sludge plant has a fast settling sludge and high
amounts of pin floc leaving the clarifier. One way to correct this problem is to
_____________.
a. increase the RAS flow.
b. reduce wasting rates.
c. increase the sludge age by wasting less.
d. increase the F/M ratio by wasting more - ANSWER: d. increase the F/M ratio by
wasting more.
The problem is old sludge. Increasing RAS just sends it back to the aeration basin and
reducing wasting will make the problem worse.
The name of the State Agency responsible for enforcing pollution control laws in
Texas - ANSWER: Texas Commission of Environmental Quality
The term pathogenic means - ANSWER: Capable of causing disease
The minimum separation between sewer lines and potable water lines is - ANSWER:
Ideally, 9 feet. At least 2 feet above and 4 feet horizontal. Separate trenches.
A licensed wastewater operator is a professional - ANSWER: consistently does best
job possible, practices personal safety, strives to improve job knowledge, strives to
keep the plant and collection system in the best appearance and working order
An important step in testing a sample for Total Suspended Solids is - ANSWER:
Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on - ANSWER:
Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant
tells the operator - ANSWER: How the plant was operating 5 days ago
Which of the following are dangerous gasses that are likely to be present in lift
stations and manholes? - ANSWER: Natural gas, gasoline fumes, hydrogen sulfide
and carbon monoxide
A preferred hydraulic method of cleaning sewer lines is - ANSWER: Hydro Jet Cleaner
Ways to reduce bad odors coming from a collection system - ANSWER: routinely
cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the
collection system
NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS
Ponding on a trickling filter is caused by _______________.
a. excessive zoogleal growth
b. improper media
c. poor primary treatment
d. all listed - ANSWER: All listed
Pounds per day of BOD per acre-feet or 1000 cubic feet of media. - ANSWER: Organic
loading
An ultrasonic flow monitoring device works on the principle of _________. -
ANSWER: Sonar
The primary causes of wastewater stoppages are ______________. - ANSWER: Roots
and grease
pH scale measures from - ANSWER: 0 to 14
An administrative penalty for discharge violations can be up to _________ per day. -
ANSWER: $10,000
When chlorine is used, the effective disinfectant is ______________.
a. HCl
b. HOCl
c. H2SO4
d. H2S - ANSWER: HOCl (hypochlorous acid)
One surface acre of pond provides treatment for about _________ people. -
ANSWER: 300
When sludge in an Imhoff tank is near ___ inches of the slot, withdraw sludge. -
ANSWER: 18
A weir is an obstruction placed in a channel causing the water to _________.
a. back up
b. pressurize
c. evaporate
d. run off - ANSWER: back up
The most important problem prevented by monitoring or restricting industrial waste
is ____________.
a. sludge contamination
,b. worker exposure
c. effluent pollutants
d. sewer fires - ANSWER: b. worker exposure
All answers are correct, but this is the best.
Safety first.
The primary purpose of returning sludge in the activated sludge process is to have
enough _________ in the aeration basin to match the food supply.
a. water
b. microorganisms
c. BOD
d. DO - ANSWER: b. microorganisms
A simple method of determining when to waste from an activated sludge plant is the
______________.
a. sludge volume index
b. mixed liquor suspended solids
c. 30 minute settling test
d. F/M ratio - ANSWER: c. 30 minute settling test
All answers are correct. 30 minute settle is the simplest method and best answer.
Imhoff tanks are _______ story units with ________ compartments. - ANSWER: 2
story; 3 compartments
Aerobic digestion is an _____________ process whereby the aerobic bacteria
consume themselves.
a. endothermic
b. endangered
c. endogenous
d.endemic - ANSWER: c. endogenous
Gas chlorinator feed rates are indicated by the _____________ in pounds per day.
a. residual
b. injector
c. rotameter
d. controller - ANSWER: c. rotameter
Minimum acceptable velocity in a gravity wastewater line - ANSWER: 2 feet per
second
Septic wastewater
a. is gray in color with a slight fecal odor.
b. is black in color and has very little odor.
c. is the result of bacterial decomposition in the absence of oxygen
d. has dissolved oxygen present with visible floating solids - ANSWER: c. is the result
of bacterial decomposition in the absence of oxygen.
It is black in color, but with a disagreeable odor.
, A contact stabilization activated sludge plant has a fast settling sludge and high
amounts of pin floc leaving the clarifier. One way to correct this problem is to
_____________.
a. increase the RAS flow.
b. reduce wasting rates.
c. increase the sludge age by wasting less.
d. increase the F/M ratio by wasting more - ANSWER: d. increase the F/M ratio by
wasting more.
The problem is old sludge. Increasing RAS just sends it back to the aeration basin and
reducing wasting will make the problem worse.
The name of the State Agency responsible for enforcing pollution control laws in
Texas - ANSWER: Texas Commission of Environmental Quality
The term pathogenic means - ANSWER: Capable of causing disease
The minimum separation between sewer lines and potable water lines is - ANSWER:
Ideally, 9 feet. At least 2 feet above and 4 feet horizontal. Separate trenches.
A licensed wastewater operator is a professional - ANSWER: consistently does best
job possible, practices personal safety, strives to improve job knowledge, strives to
keep the plant and collection system in the best appearance and working order
An important step in testing a sample for Total Suspended Solids is - ANSWER:
Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on - ANSWER:
Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant
tells the operator - ANSWER: How the plant was operating 5 days ago
Which of the following are dangerous gasses that are likely to be present in lift
stations and manholes? - ANSWER: Natural gas, gasoline fumes, hydrogen sulfide
and carbon monoxide
A preferred hydraulic method of cleaning sewer lines is - ANSWER: Hydro Jet Cleaner
Ways to reduce bad odors coming from a collection system - ANSWER: routinely
cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the
collection system
