MA WASTEWATER OPERATOR GRADE 6 TEST (SEE
DESCRIPTION) | FROM QUESTION TO PERFECTION| STUDY
WITH CONFIDENCE!
Course Code:
Course Title:
Programme:
Academic Year: 2026/2027.
Duration: 2 Hours.
Total Marks: 100.
Candidate Instructions:
1) Write your Registration Number on every answer booklet used.
2) Answer ALL questions in Section A and ANY TWO (2) questions in Section B.
3) Read each question carefully before answering.
4) Begin each question on a new page.
5) The marks for each question are indicated in brackets.
6) This paper consists of several printed pages, including this page.
7) Ensure your copy is complete before the examination begins.
8) Unauthorized materials and communication with other candidates are not permitted.
Turn Over.
APPHIA – Crafted with Care and Precision for Academic Excellence.
1
, When are monthly reports due to the MA DEP? Answer: The 15th day of every month.
What two chemicals are used for DE-CHLORINATION? Answer: Sulfur dioxide and sulfite
salts (including sodium sulfite, sodium bisulfite, and sodium metabisulfite).
How long are you required to keep MAINTENANCE records? Answer: Three years.
How long is an NPDES permit valid for before it must be renewed? Answer: Five years.
What test is used to determine coagulant levels for solids removal? Answer: Bench test.
What chemical is used to TEST for phosphorus in EFFLUENT? Answer: Ascorbic Acid.
What type of valve excels in applications of THROTTLING the flow of fluids? Answer:
Butterfly valve.
For UV treatment systems, how frequently must quartz sleeves be cleaned? Answer: Every six-
to-twelve months.
What are conductivity tests used to measure? Answer: Dissolved solids.
The presence of which gas is dangerous when MIXED with the emissions from an anaerobic
digester? Answer: Oxygen.
What are the three compounds used in wastewater treatment that increase alkalinity? Answer:
Bicarbonate, carbonate, and hydroxide.
What device is used to measure the flow of a gas? Answer: Orifice plate flow meter.
How long can FOG samples be kept if they are stored properly? Answer: 28 days.
Which class of organism present in wastewater is most resistant to chlorine disinfection?
Answer: Spores.
What happens to the chlorine demand of water after nitrification occurs? Answer: Chlorine
demand significantly increases after nitrification.
What is the target ratio of Carbon, Nitrogen, and Phosphorous for the activated sludge process?
Answer: 100C : 10N : 1P
What contaminants have the lowest pollutant limits? Answer: Nickel, Zinc, and Mercury.
As the amount of carbon dioxide in wastewater increases, the pH will... Answer: Decrease;
become more acidic.
What is "unity of command?" Answer: Employees should report to one singular "boss" whom
all direction comes from.
Describe the term "accuracy." Answer: Accuracy refers to how close a measurement is to its
true value.
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
DESCRIPTION) | FROM QUESTION TO PERFECTION| STUDY
WITH CONFIDENCE!
Course Code:
Course Title:
Programme:
Academic Year: 2026/2027.
Duration: 2 Hours.
Total Marks: 100.
Candidate Instructions:
1) Write your Registration Number on every answer booklet used.
2) Answer ALL questions in Section A and ANY TWO (2) questions in Section B.
3) Read each question carefully before answering.
4) Begin each question on a new page.
5) The marks for each question are indicated in brackets.
6) This paper consists of several printed pages, including this page.
7) Ensure your copy is complete before the examination begins.
8) Unauthorized materials and communication with other candidates are not permitted.
Turn Over.
APPHIA – Crafted with Care and Precision for Academic Excellence.
1
, When are monthly reports due to the MA DEP? Answer: The 15th day of every month.
What two chemicals are used for DE-CHLORINATION? Answer: Sulfur dioxide and sulfite
salts (including sodium sulfite, sodium bisulfite, and sodium metabisulfite).
How long are you required to keep MAINTENANCE records? Answer: Three years.
How long is an NPDES permit valid for before it must be renewed? Answer: Five years.
What test is used to determine coagulant levels for solids removal? Answer: Bench test.
What chemical is used to TEST for phosphorus in EFFLUENT? Answer: Ascorbic Acid.
What type of valve excels in applications of THROTTLING the flow of fluids? Answer:
Butterfly valve.
For UV treatment systems, how frequently must quartz sleeves be cleaned? Answer: Every six-
to-twelve months.
What are conductivity tests used to measure? Answer: Dissolved solids.
The presence of which gas is dangerous when MIXED with the emissions from an anaerobic
digester? Answer: Oxygen.
What are the three compounds used in wastewater treatment that increase alkalinity? Answer:
Bicarbonate, carbonate, and hydroxide.
What device is used to measure the flow of a gas? Answer: Orifice plate flow meter.
How long can FOG samples be kept if they are stored properly? Answer: 28 days.
Which class of organism present in wastewater is most resistant to chlorine disinfection?
Answer: Spores.
What happens to the chlorine demand of water after nitrification occurs? Answer: Chlorine
demand significantly increases after nitrification.
What is the target ratio of Carbon, Nitrogen, and Phosphorous for the activated sludge process?
Answer: 100C : 10N : 1P
What contaminants have the lowest pollutant limits? Answer: Nickel, Zinc, and Mercury.
As the amount of carbon dioxide in wastewater increases, the pH will... Answer: Decrease;
become more acidic.
What is "unity of command?" Answer: Employees should report to one singular "boss" whom
all direction comes from.
Describe the term "accuracy." Answer: Accuracy refers to how close a measurement is to its
true value.
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
