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MA Industrial Wastewater Treatment Plant Operator
Grade 2 Practice Exam 200 Questions with Answers &
Detailed Explanations ||Verified Exam!!||(2026 Edition)
pdf||Newest Exam!!!
The flow delivered to a treatment plant can be measured
by a: - Answer-Parshall Flume
The most reliable type of wastewater flow measuring
device is a - Answer-Mag Meter
Wastewater flow measurements are commonly used to: -
Answer-Establish the amount of pollutants for mass-based
discharge standards
A Rotameter is a reliable device for measuring flows of -
Answer-Treated wastewater
The head on a wastewater flow measuring flume can be
monitored by a - Answer-Bourdon tube
Conductivity tubes are used to maintain, repair, and
troubleshoot - Answer-Water systems
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A PLC could typically control - Answer-The addition of acid
or caustic to a tank
Floats and level probes should be checked to make sure
the motors are starting and stopping at the correct liquid
level and/ or also - Answer-Tested weekly for proper
operation
You walk into the treatment room and notice the pH chart
is fixed at 7, what should you check first? - Answer-pH
probe wiring
The alarms keep going off for a pH system. When you
check the system, you notice that Tank 2's pH is 5.00 and
the final pH is 10.5. What should you check first - Answer-
Tank 2's mixer
You walk into the treatment room and notice the alarm
going off and Tank 1, Tank 2, and the final pH all read the
same: 11.00. Both acid pumps (Tank 1 and Tank 2) are
running. What do you check first - Answer-Reagent level
and reagent pump prime
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When calibrating pH probes always - Answer-Clean before
calibration
You calibrated a pH probe and the response was slow.
What is the cause - Answer-Bulb is coated
Which of the following wastewater characteristics can be
monitored continuously - Answer-pH
The disadvantages of ion exchange process include? -
Answer-It may require dilution to prevent attack on resins
Why is the handling and disposal of sludge a complicated
problem? - Answer-Sludge often consists of toxic
chemicals
What adjustments should be made to a firm, dry cake, as
it related to sludge dewatering? - Answer-Generally
speaking, no adjustments are necessary
Successful operation of gravity filters depends on: -
Answer-Even dispersal of wastewater throughout the filter
, 4|Page
Unit processes often used for sludge dewatering are: -
Answer-Pressure filtration
A Parshall Flume is generally used to: - Answer-Measure
flow
The following is NOT an example of a flow measuring
device: - Answer-Manometer
What is the difference between digital and analog meters -
Answer-Digital is easier to read
A pH recorder indicated a 10.0 when a pH of 8.0 is
desired. Adding acid makes no difference. A portable pH
meter indicated the pH is less than 10. Which item would
you check first - Answer-Sensor
Sulfide precipitation of metal is - Answer-More expensive
than hydroxide precipitation
MA Industrial Wastewater Treatment Plant Operator
Grade 2 Practice Exam 200 Questions with Answers &
Detailed Explanations ||Verified Exam!!||(2026 Edition)
pdf||Newest Exam!!!
The flow delivered to a treatment plant can be measured
by a: - Answer-Parshall Flume
The most reliable type of wastewater flow measuring
device is a - Answer-Mag Meter
Wastewater flow measurements are commonly used to: -
Answer-Establish the amount of pollutants for mass-based
discharge standards
A Rotameter is a reliable device for measuring flows of -
Answer-Treated wastewater
The head on a wastewater flow measuring flume can be
monitored by a - Answer-Bourdon tube
Conductivity tubes are used to maintain, repair, and
troubleshoot - Answer-Water systems
,2|Page
A PLC could typically control - Answer-The addition of acid
or caustic to a tank
Floats and level probes should be checked to make sure
the motors are starting and stopping at the correct liquid
level and/ or also - Answer-Tested weekly for proper
operation
You walk into the treatment room and notice the pH chart
is fixed at 7, what should you check first? - Answer-pH
probe wiring
The alarms keep going off for a pH system. When you
check the system, you notice that Tank 2's pH is 5.00 and
the final pH is 10.5. What should you check first - Answer-
Tank 2's mixer
You walk into the treatment room and notice the alarm
going off and Tank 1, Tank 2, and the final pH all read the
same: 11.00. Both acid pumps (Tank 1 and Tank 2) are
running. What do you check first - Answer-Reagent level
and reagent pump prime
,3|Page
When calibrating pH probes always - Answer-Clean before
calibration
You calibrated a pH probe and the response was slow.
What is the cause - Answer-Bulb is coated
Which of the following wastewater characteristics can be
monitored continuously - Answer-pH
The disadvantages of ion exchange process include? -
Answer-It may require dilution to prevent attack on resins
Why is the handling and disposal of sludge a complicated
problem? - Answer-Sludge often consists of toxic
chemicals
What adjustments should be made to a firm, dry cake, as
it related to sludge dewatering? - Answer-Generally
speaking, no adjustments are necessary
Successful operation of gravity filters depends on: -
Answer-Even dispersal of wastewater throughout the filter
, 4|Page
Unit processes often used for sludge dewatering are: -
Answer-Pressure filtration
A Parshall Flume is generally used to: - Answer-Measure
flow
The following is NOT an example of a flow measuring
device: - Answer-Manometer
What is the difference between digital and analog meters -
Answer-Digital is easier to read
A pH recorder indicated a 10.0 when a pH of 8.0 is
desired. Adding acid makes no difference. A portable pH
meter indicated the pH is less than 10. Which item would
you check first - Answer-Sensor
Sulfide precipitation of metal is - Answer-More expensive
than hydroxide precipitation
