TCEQ class A water license exam
Already Passed!! / Texas Wastewater
A
The oxygen depletion of BOD dilution water should not exceed -
✔✔✔ANSWER-0.2 mg/L.
What is the minimum air gap when making water and wastewater connections? -
✔✔✔ANSWER-Minimum of one inch or twice the inlet pipe size whichever is
greater.
What is the minimum useful size pipe to prime a centrifugal pump? -
✔✔✔ANSWER-1 inch
An anaerobic digester must maintain an average year round temperature of -
✔✔✔ANSWER-95 degrees F.
How do you remove shoring from a trench? - ✔✔✔ANSWER-From the
bottom up
,Which of the following methods would you use to increase the degree of
nitrification in an activated sludge plant? - ✔✔✔ANSWER-increase dissolved
oxygen levels and increase the sludge age
Which of the following are considered normal operator controls on an activated
sludge plant? - ✔✔✔ANSWER-*aeration rates *return and wasting rates
Reducing the return sludge flow rate for an activated sludge system which has a
good settling sludge will ________. - ✔✔✔ANSWER-increase the RAS
concentration and the clarifier sludge blanket thickness
An extended air 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 ________. -
✔✔✔ANSWER-* reduce the MCRT by wasting more
* increase the F/M ratio by wasting more
The primary causes of wastewater stoppages are ________. - ✔✔✔ANSWER-
roots and grease
The inside diameter of a manhole must be how wide? - ✔✔✔ANSWER-48
inches
On a construction job site, equipment booms must maintain at least how many feet
of clearance from overhead electric lines? - ✔✔✔ANSWER-10 feet
, Digester gas should contain about ________. - ✔✔✔ANSWER-a. 65% - 75%
methane
A treatment plant has two primary clarifiers. Each has a diameter of 40 feet and a
depth of 12 feet. If the design flow is 1.2 mgd, find the surface loading on each
clarifier in gallons/ft2/day. Assume the flow is equally split between the two
clarifiers.
3.14 x 20 x 20 = 1256
1,200,000 /2
= 600,000 gallons each
600,000/ 1256 - ✔✔✔ANSWER-b. 478 gallons/ft2/day
Distilled water used for the BOD analysis should not exceed ________. -
✔✔✔ANSWER-0.2 mg/L depletion
One element of being an effective communicator is to ________. -
✔✔✔ANSWER-a. be a good listener
In order to promote a collaborative management style, one thing a supervisor can
do is ________. - ✔✔✔ANSWER-join the team as a member rather than as
boss
Already Passed!! / Texas Wastewater
A
The oxygen depletion of BOD dilution water should not exceed -
✔✔✔ANSWER-0.2 mg/L.
What is the minimum air gap when making water and wastewater connections? -
✔✔✔ANSWER-Minimum of one inch or twice the inlet pipe size whichever is
greater.
What is the minimum useful size pipe to prime a centrifugal pump? -
✔✔✔ANSWER-1 inch
An anaerobic digester must maintain an average year round temperature of -
✔✔✔ANSWER-95 degrees F.
How do you remove shoring from a trench? - ✔✔✔ANSWER-From the
bottom up
,Which of the following methods would you use to increase the degree of
nitrification in an activated sludge plant? - ✔✔✔ANSWER-increase dissolved
oxygen levels and increase the sludge age
Which of the following are considered normal operator controls on an activated
sludge plant? - ✔✔✔ANSWER-*aeration rates *return and wasting rates
Reducing the return sludge flow rate for an activated sludge system which has a
good settling sludge will ________. - ✔✔✔ANSWER-increase the RAS
concentration and the clarifier sludge blanket thickness
An extended air 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 ________. -
✔✔✔ANSWER-* reduce the MCRT by wasting more
* increase the F/M ratio by wasting more
The primary causes of wastewater stoppages are ________. - ✔✔✔ANSWER-
roots and grease
The inside diameter of a manhole must be how wide? - ✔✔✔ANSWER-48
inches
On a construction job site, equipment booms must maintain at least how many feet
of clearance from overhead electric lines? - ✔✔✔ANSWER-10 feet
, Digester gas should contain about ________. - ✔✔✔ANSWER-a. 65% - 75%
methane
A treatment plant has two primary clarifiers. Each has a diameter of 40 feet and a
depth of 12 feet. If the design flow is 1.2 mgd, find the surface loading on each
clarifier in gallons/ft2/day. Assume the flow is equally split between the two
clarifiers.
3.14 x 20 x 20 = 1256
1,200,000 /2
= 600,000 gallons each
600,000/ 1256 - ✔✔✔ANSWER-b. 478 gallons/ft2/day
Distilled water used for the BOD analysis should not exceed ________. -
✔✔✔ANSWER-0.2 mg/L depletion
One element of being an effective communicator is to ________. -
✔✔✔ANSWER-a. be a good listener
In order to promote a collaborative management style, one thing a supervisor can
do is ________. - ✔✔✔ANSWER-join the team as a member rather than as
boss
