WASTEWATER (ONTARIO) CLASS 2 EXAM QUESTIONS
WITH ACCURATE SOLUTIONS
1) When does the process of disinfection take place at a wastewater treatment plant? --
Correct Answer ✔✔ The last process in wastewater treatment
2) A raw sewage sample can be obtained at which of the following process? -- Correct
Answer ✔✔ Primary clarifier
3) Regulation 129/04 under the OWRA is a regulation that: -- Correct Answer ✔✔
Explains the mandatory licensing of wastewater treatment operators
4) Which of the following chemical are not used to assist in chemical coagulation during
primary treatment process? -- Correct Answer ✔✔ Sodium hypochlorite
5) During the nitrification process, nitrifying bacteria are able to convert: -- Correct
Answer ✔✔ Ammonia (NH4) to Nitrite (NO2) and then to nitrates (NO3)
6) If a fuse continues to blow, an operator should: -- Correct Answer ✔✔ Inspect the
affected equipment to determine the cause
,7) A horizontal centrifugal pump has "rope" packing. When the pump is operating,
water slowly drips from the packing gland. This indicates that: -- Correct Answer
✔✔ Packing bolts or nuts on the packing gland are properly adjusted
8) When a high organic waste load reaches an activated sludge plant, the operator's
first indication is a decrease in: -- Correct Answer ✔✔ DO decrease in the aeration
tank
9) what is the reason that would cause a pump to not deliver liquid at all? -- Correct
Answer ✔✔ pump is not primed or has lostvots prime
10) during morning checks you notice that the bearings in the pump are running hot.
what can cause this? -- Correct Answer ✔✔ the bearings are over lubricated
11) over time you have noticed that the packing in a pump requires frequent
replacement. what can be the cause? -- Correct Answer ✔✔ there is insufficient seal
12) Operator checks state that the pump at the highlift building is excessively leaking out
of the stuffing box. What could be the source of the problem? -- Correct Answer
✔✔ Stuffing box is improperly packed
13) You have noticed the following when a centrifugal pump is operating: vibration, heat,
excessive noise and no flow. What could be causing these conditions? -- Correct
Answer ✔✔ The pump is cavitating
14) Under the Environmental Protection Act (EPA), to whom is notification of a spill
required? -- Correct Answer ✔✔ Ministry of the Environment
, 15) The activated sludge process is an _____________________ process. -- Correct
Answer ✔✔ Aerobic
16) What are the two commonly used seals in centrifugal pumps? -- Correct Answer
✔✔ Packing and mechanical seals
17) Select the most popular level control system used in pumping stations. -- Correct
Answer ✔✔ Ultrasonic transducers
18) Which of the following best describes the maintenance of a stabilization lagoon? --
Correct Answer ✔✔ Removing cattails and weed from the lagoon
19) In order to prevent the bacteria in the secondary treatment stage from dying off, an
ample supply of ______________________ must be supplied continuously. --
Correct Answer ✔✔ Food and oxygen
20) A simple method to measured dissolved oxygen in an aeration tank is to use: --
Correct Answer ✔✔ A dissolved oxygen meter
21) Which of the following best describes the next treatment process for raw sludge? --
Correct Answer ✔✔ Digester
22) Which of the following should be followed when providing first aid for burns? --
Correct Answer ✔✔ Flood with cold water
WITH ACCURATE SOLUTIONS
1) When does the process of disinfection take place at a wastewater treatment plant? --
Correct Answer ✔✔ The last process in wastewater treatment
2) A raw sewage sample can be obtained at which of the following process? -- Correct
Answer ✔✔ Primary clarifier
3) Regulation 129/04 under the OWRA is a regulation that: -- Correct Answer ✔✔
Explains the mandatory licensing of wastewater treatment operators
4) Which of the following chemical are not used to assist in chemical coagulation during
primary treatment process? -- Correct Answer ✔✔ Sodium hypochlorite
5) During the nitrification process, nitrifying bacteria are able to convert: -- Correct
Answer ✔✔ Ammonia (NH4) to Nitrite (NO2) and then to nitrates (NO3)
6) If a fuse continues to blow, an operator should: -- Correct Answer ✔✔ Inspect the
affected equipment to determine the cause
,7) A horizontal centrifugal pump has "rope" packing. When the pump is operating,
water slowly drips from the packing gland. This indicates that: -- Correct Answer
✔✔ Packing bolts or nuts on the packing gland are properly adjusted
8) When a high organic waste load reaches an activated sludge plant, the operator's
first indication is a decrease in: -- Correct Answer ✔✔ DO decrease in the aeration
tank
9) what is the reason that would cause a pump to not deliver liquid at all? -- Correct
Answer ✔✔ pump is not primed or has lostvots prime
10) during morning checks you notice that the bearings in the pump are running hot.
what can cause this? -- Correct Answer ✔✔ the bearings are over lubricated
11) over time you have noticed that the packing in a pump requires frequent
replacement. what can be the cause? -- Correct Answer ✔✔ there is insufficient seal
12) Operator checks state that the pump at the highlift building is excessively leaking out
of the stuffing box. What could be the source of the problem? -- Correct Answer
✔✔ Stuffing box is improperly packed
13) You have noticed the following when a centrifugal pump is operating: vibration, heat,
excessive noise and no flow. What could be causing these conditions? -- Correct
Answer ✔✔ The pump is cavitating
14) Under the Environmental Protection Act (EPA), to whom is notification of a spill
required? -- Correct Answer ✔✔ Ministry of the Environment
, 15) The activated sludge process is an _____________________ process. -- Correct
Answer ✔✔ Aerobic
16) What are the two commonly used seals in centrifugal pumps? -- Correct Answer
✔✔ Packing and mechanical seals
17) Select the most popular level control system used in pumping stations. -- Correct
Answer ✔✔ Ultrasonic transducers
18) Which of the following best describes the maintenance of a stabilization lagoon? --
Correct Answer ✔✔ Removing cattails and weed from the lagoon
19) In order to prevent the bacteria in the secondary treatment stage from dying off, an
ample supply of ______________________ must be supplied continuously. --
Correct Answer ✔✔ Food and oxygen
20) A simple method to measured dissolved oxygen in an aeration tank is to use: --
Correct Answer ✔✔ A dissolved oxygen meter
21) Which of the following best describes the next treatment process for raw sludge? --
Correct Answer ✔✔ Digester
22) Which of the following should be followed when providing first aid for burns? --
Correct Answer ✔✔ Flood with cold water
