Wastewater Grade 1 Exam Questions
with All Correct Answers 2024 Latest
Update
Which of the following will not cause short-circuiting in a clarifier?
A. Uneven weir settings
B. Flow line of launder is low
C. Damaged or missing inlet line baffles
D. Velocity of wastewater is greater in some sections than in others - Answer-B
A grab sample is most suited for these constituents.
A. BOD
B. TSS
C. Suspended Solid Concentration
D. Residual Chlorine - Answer-D
The organic loading to a trickling filter is expressed as:
A. lbs BOD/day/1,000 ft3
B. lbs BOD/day/1,000 ft2
C. lbs BOD/day/ft2
D. lbs BOD/day/1,000 gallon - Answer-A
How often should the sludge at the bottom of a clarifier be pumped?
A. Once a week
B. Bi-weekly
C. Frequently throughout the day
D. Once every three days - Answer-C
Which of the following will not affect settling characteristic in a clarifier?
A. Temperature
B. Short Circuiting
C. Detention Time
D. Depth of lauder - Answer-D
The best way to evaluate the effluent TSS concentration from a plant is to:
A. Check the grab sample at the peak flow
B. Check the composite sample of the TSS
C. Check the grab sample at low flow
D. Check the grab sample at average flow - Answer-B
, Which of the following is not associated with an aeration tank?
A. RAS
B. WAS
C. RBS
D. MCRT - Answer-C
What creates hydrogen sulfide?
A. Excessive aeration
B. Surface active agents
C. Organic matter under aeration condition
D. Decomposing organic matter under anaerobic condition - Answer-D
A pond with a detention time of less than three days will perform similar to:
A. Sedimentation tank
B. Aeration tank
C. Trickling filter
D. RBC - Answer-C
Which type of bacteria is used for a trickling filter?
A. Anaerobic Bacteria
B. Anoxic Bacteria
C. Aerobic Bacteria
D. Facultative Bacteria - Answer-C
Which of the following is not associated with a trickling filter?
A. Media
B. Filamentations Bacteria
C. Zoogloeal Film
D. Recirculation - Answer-B
What is MCRT?
A. A calculation that indicates the tendency of activated sludge solids to thicken.
B. A measure of food provided to the bacteria in the aeration tank
C. The amount of volatile suspended solids in the mixed liquor of an aeration tank
D. An expression of the average time in a microorganism will spend in an activated
sludge process. - Answer-D
A flow rate of 1.1 MGD with a BOD of 150 mg/l and TSS concentration of 105 mg/l
enters a trickling filter, which is 60 feet in diameter and 5 feet deep calculate the organic
loading rate.
A. 150.4 lbs BOD/day/1,000 cubic ft (FT3)
B. 200.4 lbs BOD/day/1,000 cubic ft (FT3)
C. 47.4 lbs BOD/day/1,000 cubic ft (FT3)
D. 97.4 lbs BOD/day/1,000 cubic ft (FT3) - Answer-97.4 lbs BOD/day/1,000 cubic ft
with All Correct Answers 2024 Latest
Update
Which of the following will not cause short-circuiting in a clarifier?
A. Uneven weir settings
B. Flow line of launder is low
C. Damaged or missing inlet line baffles
D. Velocity of wastewater is greater in some sections than in others - Answer-B
A grab sample is most suited for these constituents.
A. BOD
B. TSS
C. Suspended Solid Concentration
D. Residual Chlorine - Answer-D
The organic loading to a trickling filter is expressed as:
A. lbs BOD/day/1,000 ft3
B. lbs BOD/day/1,000 ft2
C. lbs BOD/day/ft2
D. lbs BOD/day/1,000 gallon - Answer-A
How often should the sludge at the bottom of a clarifier be pumped?
A. Once a week
B. Bi-weekly
C. Frequently throughout the day
D. Once every three days - Answer-C
Which of the following will not affect settling characteristic in a clarifier?
A. Temperature
B. Short Circuiting
C. Detention Time
D. Depth of lauder - Answer-D
The best way to evaluate the effluent TSS concentration from a plant is to:
A. Check the grab sample at the peak flow
B. Check the composite sample of the TSS
C. Check the grab sample at low flow
D. Check the grab sample at average flow - Answer-B
, Which of the following is not associated with an aeration tank?
A. RAS
B. WAS
C. RBS
D. MCRT - Answer-C
What creates hydrogen sulfide?
A. Excessive aeration
B. Surface active agents
C. Organic matter under aeration condition
D. Decomposing organic matter under anaerobic condition - Answer-D
A pond with a detention time of less than three days will perform similar to:
A. Sedimentation tank
B. Aeration tank
C. Trickling filter
D. RBC - Answer-C
Which type of bacteria is used for a trickling filter?
A. Anaerobic Bacteria
B. Anoxic Bacteria
C. Aerobic Bacteria
D. Facultative Bacteria - Answer-C
Which of the following is not associated with a trickling filter?
A. Media
B. Filamentations Bacteria
C. Zoogloeal Film
D. Recirculation - Answer-B
What is MCRT?
A. A calculation that indicates the tendency of activated sludge solids to thicken.
B. A measure of food provided to the bacteria in the aeration tank
C. The amount of volatile suspended solids in the mixed liquor of an aeration tank
D. An expression of the average time in a microorganism will spend in an activated
sludge process. - Answer-D
A flow rate of 1.1 MGD with a BOD of 150 mg/l and TSS concentration of 105 mg/l
enters a trickling filter, which is 60 feet in diameter and 5 feet deep calculate the organic
loading rate.
A. 150.4 lbs BOD/day/1,000 cubic ft (FT3)
B. 200.4 lbs BOD/day/1,000 cubic ft (FT3)
C. 47.4 lbs BOD/day/1,000 cubic ft (FT3)
D. 97.4 lbs BOD/day/1,000 cubic ft (FT3) - Answer-97.4 lbs BOD/day/1,000 cubic ft
