TEXAS WASTEWATER CLASS A NEWEST
ACTUAL EXAM COMPLETE 200 QESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+
Why is recirculation needed in a trickling filter? - ANSWER- a.
Keep the media wet b. Further reduce BOD c. Flood the filter
to control ponding and filter flies 15.
What type of fire extinguisher would be used on an electrical
control panel that has been de-energized? - ANSWER- f. a
class a and d class c Disinfection with chlorine is the most
effective at a pH of - ANSWER- 6.0 17. The biomass on a
normal functioning RBC has what appearance? - ANSWER-
,Grey to brown and 0.05 to 0.1 inch thick The sludge from a
primary clarifier should contain what percent solids? -
ANSWER- b. 4% to 6% 2 | P a g e What is eutrophication in a
pond system? - ANSWEREnrichment with nitrogen and
phosphorous Causes algae blooms 20. A wastewater
stabilization pond has 130,680 sq. ft. It has a three to one
slope on the embankment and has an average depth of 5 ft.
Approximately how many people will this pond provide
wastewater treatment for? 130,680 sq ft = 3 acres x 35 lbs /
BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person 43,560
sq ft l acre - ANSWER- d. 600 A"Racetrack" is what type of
Activate Sludge treatment? - ANSWER- Extended air Which
form of activated sludge must have primary clarifiers? -
ANSWER- Conventional What is the relationship between
F/M ratio and MCRT? - ANSWER- Indirect; if one goes up, the
other goes down Which activated sludge process does not
achieve complete nitrification? - ANSWER- Contact
stabilization Which form of activated sludge does the better
job of handling shock or toxic loads? - ANSWER- Complete
mix 3 | P a g e Which of activated sludge has two aeration
basins per single treatment unit? - ANSWER- Contact
stabilization 27. A complete mix activated sludge plant has a
fast settling sludge and high amounts of pin floc leaving the
clarifier. One method of correcting the problem is to -
ANSWER- Increase F/M ratio by wasting more problem is
Testing of mixed liquor indicates the MLSS is 2500 mg/L and
the settling test shows that a 1000 ml sample settles to 400
mls after 30 minutes. What is the SVI? 400 x 1000 2500 160 -
ANSWER- 160 In the problem above, what the sludge
,quality? - ANSWERBulking Which activated sludge process
has 18 to 20 + hours detention time in the aeration basin? -
ANSWER- Extended air What is the minimum clearance from
the sidewall of a pipe to the trench wall in an excavation? -
ANSWER- 4 inches 4 | P a g e What is the definition of pH? -
ANSWER- The logarithm of the reciprocal of the hydrogen ion
concentration The negative logarithm of the hydrogen ion
concentration How often should pH meters be calibrated? -
ANSWER- Daily trench is 4,100 feet long, four 4 wide and 6
feet deep. There is a 12-inch diameter pipe in the bottom of
the trench. How many cubic yards of material were removed
from the trench? 4x6x4,100 3,644 27 - ANSWER- 3,644 In the
problem above, how many cubic yards of material will be
required to fill the trench? 3.14x0.5 x0.5 x 4,100 =119cu yds
27 3,644 -119 = 3,525 - ANSWER- 3,525 What is the standard
chlorine residual and contact time on Texas discharge
permits? - ANSWER- e. None of the above organization
increases, As the complexity of an organization increases,
what management function becomes most important? –
ANSWER Planning
, Seeding of BOD samples is necessary when samples-
(answer)-(All of the above) have a chlorine residual, have a
previously 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
treatment system?-(answer)-Summer
20. A wastewater stabilization pond has 130,680 sq. ft. It has
a three to one slope on the embankment and has an average
depth of 5 ft. Approximately how many people will this pond
provide wastewater treatment for? 130,680 sq ft = 3 acres x
35 lbs / BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person
43,560 sq ft l acre-(answer)-d. 600
A"Racetrack" is what type of Activate Sludge treatment?-
(answer)-Extended air
Which form of activated sludge must have primary clarifiers?-
(answer)-Conventional
What is the relationship between F/M ratio and MCRT?-
(answer)-Indirect; if one goes up, the other goes down
A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of
ACTUAL EXAM COMPLETE 200 QESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+
Why is recirculation needed in a trickling filter? - ANSWER- a.
Keep the media wet b. Further reduce BOD c. Flood the filter
to control ponding and filter flies 15.
What type of fire extinguisher would be used on an electrical
control panel that has been de-energized? - ANSWER- f. a
class a and d class c Disinfection with chlorine is the most
effective at a pH of - ANSWER- 6.0 17. The biomass on a
normal functioning RBC has what appearance? - ANSWER-
,Grey to brown and 0.05 to 0.1 inch thick The sludge from a
primary clarifier should contain what percent solids? -
ANSWER- b. 4% to 6% 2 | P a g e What is eutrophication in a
pond system? - ANSWEREnrichment with nitrogen and
phosphorous Causes algae blooms 20. A wastewater
stabilization pond has 130,680 sq. ft. It has a three to one
slope on the embankment and has an average depth of 5 ft.
Approximately how many people will this pond provide
wastewater treatment for? 130,680 sq ft = 3 acres x 35 lbs /
BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person 43,560
sq ft l acre - ANSWER- d. 600 A"Racetrack" is what type of
Activate Sludge treatment? - ANSWER- Extended air Which
form of activated sludge must have primary clarifiers? -
ANSWER- Conventional What is the relationship between
F/M ratio and MCRT? - ANSWER- Indirect; if one goes up, the
other goes down Which activated sludge process does not
achieve complete nitrification? - ANSWER- Contact
stabilization Which form of activated sludge does the better
job of handling shock or toxic loads? - ANSWER- Complete
mix 3 | P a g e Which of activated sludge has two aeration
basins per single treatment unit? - ANSWER- Contact
stabilization 27. A complete mix activated sludge plant has a
fast settling sludge and high amounts of pin floc leaving the
clarifier. One method of correcting the problem is to -
ANSWER- Increase F/M ratio by wasting more problem is
Testing of mixed liquor indicates the MLSS is 2500 mg/L and
the settling test shows that a 1000 ml sample settles to 400
mls after 30 minutes. What is the SVI? 400 x 1000 2500 160 -
ANSWER- 160 In the problem above, what the sludge
,quality? - ANSWERBulking Which activated sludge process
has 18 to 20 + hours detention time in the aeration basin? -
ANSWER- Extended air What is the minimum clearance from
the sidewall of a pipe to the trench wall in an excavation? -
ANSWER- 4 inches 4 | P a g e What is the definition of pH? -
ANSWER- The logarithm of the reciprocal of the hydrogen ion
concentration The negative logarithm of the hydrogen ion
concentration How often should pH meters be calibrated? -
ANSWER- Daily trench is 4,100 feet long, four 4 wide and 6
feet deep. There is a 12-inch diameter pipe in the bottom of
the trench. How many cubic yards of material were removed
from the trench? 4x6x4,100 3,644 27 - ANSWER- 3,644 In the
problem above, how many cubic yards of material will be
required to fill the trench? 3.14x0.5 x0.5 x 4,100 =119cu yds
27 3,644 -119 = 3,525 - ANSWER- 3,525 What is the standard
chlorine residual and contact time on Texas discharge
permits? - ANSWER- e. None of the above organization
increases, As the complexity of an organization increases,
what management function becomes most important? –
ANSWER Planning
, Seeding of BOD samples is necessary when samples-
(answer)-(All of the above) have a chlorine residual, have a
previously 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
treatment system?-(answer)-Summer
20. A wastewater stabilization pond has 130,680 sq. ft. It has
a three to one slope on the embankment and has an average
depth of 5 ft. Approximately how many people will this pond
provide wastewater treatment for? 130,680 sq ft = 3 acres x
35 lbs / BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person
43,560 sq ft l acre-(answer)-d. 600
A"Racetrack" is what type of Activate Sludge treatment?-
(answer)-Extended air
Which form of activated sludge must have primary clarifiers?-
(answer)-Conventional
What is the relationship between F/M ratio and MCRT?-
(answer)-Indirect; if one goes up, the other goes down
A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of
