2026-2027 Massachusetts Wastewater
Exam. Questions & Correct Verified
Answers. Graded A
a Comminutor is used to - ANSgrind and shred incoming wastewater
particles
A distinctive musty odor which is slightly offsensive means: - ANSseptic
wastewater
a good settling tank always: - ANSprovides detention time, has sufficient
weir length, and provides even distribution
a Parshall Flume is used to : - ANSMeasure flow
A person with an up to date certification in first aid is required for: -
ANSEach Shift
A primary clarifier can reduce BOD of raw wastewater by how much? -
ANS40-60%
A primary clarifier should produce sludge of what concentration? - ANS4-
8%
1
,A public water supply services at LEAST - ANS15 connections, 25 or more
people for more than 60 days per year
A reserve supply of all parts and supplies having a high replacement rate
shall: - ANSprevent maintenance problems
According to 314 CMR 12, a PM is: - ANSrequired
According to 314 CMR 12, instruction in the use of chlorine kits: - ANSis
strongly suggested
according to the USEPA, failure to comply with monitoring leaves: - ANS1
year to notify customers
Activated sludge is: - ANSBiological treatment
Activated sludge process that has a F/M of 0.05 and sludge age of 30 days
is an: - ANSoxidation ditch
Adequate tools, equipment, spare parts, and supplies shall be provided to:
- ANSMaintain and operate all appurtenances
Alarm systems provided by wastewater treatment facility operators shall be
tested: - ANSTwice Annually
All tidegates and flap valves shall be: - ANSMaintained in an operable
condition
2
, All wastewater personnel shall have immediate access to: - ANSan
approved first aid kit
Alum is only corrosive when mixed with: - ANSWater
Any POTW with a total design flow greater than this is required to have a
pretreatment program: - ANS5 MGD
Are pH and acidity critical in Nitrification? - ANSno
Are raw wastewater and effluent the same? - ANSno
At a grade 3 facility, what licenses do a Chief operator and an Assistant
chief operator need? - ANSGrade 3, Grade 2
Bar screens or racks should be cleaned: - ANSAs often as needed
Basic objective of activated sludge process is to maintain balanced
conditions in the aeration tank, this is called - ANSFood/Microorganism
ratio
BOD is: - ANSMeasure of oxygen required during the stabilization of
decomposable organic solids by aerobic action
Can a grade 6 operator sign a monthly permit report for a grade 4 plant? -
ANSNot enough information
3
Exam. Questions & Correct Verified
Answers. Graded A
a Comminutor is used to - ANSgrind and shred incoming wastewater
particles
A distinctive musty odor which is slightly offsensive means: - ANSseptic
wastewater
a good settling tank always: - ANSprovides detention time, has sufficient
weir length, and provides even distribution
a Parshall Flume is used to : - ANSMeasure flow
A person with an up to date certification in first aid is required for: -
ANSEach Shift
A primary clarifier can reduce BOD of raw wastewater by how much? -
ANS40-60%
A primary clarifier should produce sludge of what concentration? - ANS4-
8%
1
,A public water supply services at LEAST - ANS15 connections, 25 or more
people for more than 60 days per year
A reserve supply of all parts and supplies having a high replacement rate
shall: - ANSprevent maintenance problems
According to 314 CMR 12, a PM is: - ANSrequired
According to 314 CMR 12, instruction in the use of chlorine kits: - ANSis
strongly suggested
according to the USEPA, failure to comply with monitoring leaves: - ANS1
year to notify customers
Activated sludge is: - ANSBiological treatment
Activated sludge process that has a F/M of 0.05 and sludge age of 30 days
is an: - ANSoxidation ditch
Adequate tools, equipment, spare parts, and supplies shall be provided to:
- ANSMaintain and operate all appurtenances
Alarm systems provided by wastewater treatment facility operators shall be
tested: - ANSTwice Annually
All tidegates and flap valves shall be: - ANSMaintained in an operable
condition
2
, All wastewater personnel shall have immediate access to: - ANSan
approved first aid kit
Alum is only corrosive when mixed with: - ANSWater
Any POTW with a total design flow greater than this is required to have a
pretreatment program: - ANS5 MGD
Are pH and acidity critical in Nitrification? - ANSno
Are raw wastewater and effluent the same? - ANSno
At a grade 3 facility, what licenses do a Chief operator and an Assistant
chief operator need? - ANSGrade 3, Grade 2
Bar screens or racks should be cleaned: - ANSAs often as needed
Basic objective of activated sludge process is to maintain balanced
conditions in the aeration tank, this is called - ANSFood/Microorganism
ratio
BOD is: - ANSMeasure of oxygen required during the stabilization of
decomposable organic solids by aerobic action
Can a grade 6 operator sign a monthly permit report for a grade 4 plant? -
ANSNot enough information
3
