TEXAS WASTEWATER CLASS C EXAM
2024-2025 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY
GRADED A+|NEWEST|GUARANTEED
PASS |LATEST UPDATE
What device(s) can be used as an emergency shut-off for the drive unit of a circular clarifier?
Shear Pins
You are the operator-on-duty. The alarm for the fire detector in the Belt Filter Press Control Room goes
off. What type of fire extinguisher would you take to respond to this alarm?
Class C
When working in an area with two or more floor coverings (for example, grating and checker-plate), be
sure that they are always _____.
Secured together
When working in confined spaces where flammable gases may be present, use only toolsmade of
A non sparking alloy
A treatment plant should have a valve exercise program in which all plant valves are exercised (opened
and closed)
Once a year
Immediate first aid for burns is to?
Flood with cold water
Recommended personal hygiene practices to minimize the risk of being infected by wastewater
pathogens include
1|Page
,Changing out of your work clothes and showering before leaving work
What is the best protection against the risk of exposure to infections and disease at a wastewater plant?
Personal Hygenie
Regarding fire extinguisher training in the workplace. The employer must provide what?
A written and practiced emergency action plan.
The combination of methane and which other gas can be very combustible?
Oxygen
In what location of the sewer manhole would methane gas be found?
At the top
Which type of fire is safe for a pressurized water extinguisher or water hose to be used on?
Brush
Mixing dry granular chlorine (HTH) with petroleum products can cause which of the following?
Create a fire or explosive condition
The fusible plugs found on a 150lb cylinders and one-ton chlorinecontainers are designed to melt at
what temperature range?
158-165 degrees Fahrenheit
In the event of a large leak of chlorine is occurring, what is the first action the operator should take?
Immediately notify local fire and police departments
A Class C type fire involves?
Electrical equipment
A common fire extinguisher is AB or ABC type. What is the media contained inside these fire
extinguishers?
Dry Powder
This toxic gas impairs one's sense of smell rapidly at high concentrations as it paralyses the respiratory
organs. At lower concentrations it has a rotten egg odor.
Hydrogen Sulfide Gas
Coliform bacteria are:
More resistant to chlorination than pathogenic bacteria
Coliform bacteria are:
Indicators
2|Page
, E. Coli results must always be higher or lower than fecal coliform results?
Lower
Waterborne diseases and illnesses common to the wastewater industryinclude dysentery, hepatitis,
polio, typhoid, and what other disease?
Cholera
How many fusible plugs are in a 1 ton chlorine container?
6
What is the proper amount of oxygen to enter a confined space?
19.5% - 23.5%
Which safety procedure can prevent accidental re-energizing of electrical energy while maintaining a
piece of equipment?
Use proper LO/TO procedures
If a leak of liquid chlorine occurs, one part of the liquid chlorine can expand to how many parts of
gaseous chlorine at room temperature and average barometric pressure?
457 parts of gas.
Chlorine gas is how many times heavier than air?
2.5 times
Methane gas is lighter than air
True
A pump's seal water pressure should be set at
5 to 10 psi more than the pump operating discharge pressure
What does a gradual increase in the bearing temperature of a centrifugal blower indicate?
There is a problem with the bearing lubrication or connection
How often should the packing on a gate valve be replaced?
As required
What is surging in a centrifugal blower?
When the blower's discharge pressure is less than the aeration system's backpressure
Pumps are often required to bring wastewater into a treatment plant. What types of pumps are typically
used to lift influent wastewater?
Centrifugal
3|Page
2024-2025 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY
GRADED A+|NEWEST|GUARANTEED
PASS |LATEST UPDATE
What device(s) can be used as an emergency shut-off for the drive unit of a circular clarifier?
Shear Pins
You are the operator-on-duty. The alarm for the fire detector in the Belt Filter Press Control Room goes
off. What type of fire extinguisher would you take to respond to this alarm?
Class C
When working in an area with two or more floor coverings (for example, grating and checker-plate), be
sure that they are always _____.
Secured together
When working in confined spaces where flammable gases may be present, use only toolsmade of
A non sparking alloy
A treatment plant should have a valve exercise program in which all plant valves are exercised (opened
and closed)
Once a year
Immediate first aid for burns is to?
Flood with cold water
Recommended personal hygiene practices to minimize the risk of being infected by wastewater
pathogens include
1|Page
,Changing out of your work clothes and showering before leaving work
What is the best protection against the risk of exposure to infections and disease at a wastewater plant?
Personal Hygenie
Regarding fire extinguisher training in the workplace. The employer must provide what?
A written and practiced emergency action plan.
The combination of methane and which other gas can be very combustible?
Oxygen
In what location of the sewer manhole would methane gas be found?
At the top
Which type of fire is safe for a pressurized water extinguisher or water hose to be used on?
Brush
Mixing dry granular chlorine (HTH) with petroleum products can cause which of the following?
Create a fire or explosive condition
The fusible plugs found on a 150lb cylinders and one-ton chlorinecontainers are designed to melt at
what temperature range?
158-165 degrees Fahrenheit
In the event of a large leak of chlorine is occurring, what is the first action the operator should take?
Immediately notify local fire and police departments
A Class C type fire involves?
Electrical equipment
A common fire extinguisher is AB or ABC type. What is the media contained inside these fire
extinguishers?
Dry Powder
This toxic gas impairs one's sense of smell rapidly at high concentrations as it paralyses the respiratory
organs. At lower concentrations it has a rotten egg odor.
Hydrogen Sulfide Gas
Coliform bacteria are:
More resistant to chlorination than pathogenic bacteria
Coliform bacteria are:
Indicators
2|Page
, E. Coli results must always be higher or lower than fecal coliform results?
Lower
Waterborne diseases and illnesses common to the wastewater industryinclude dysentery, hepatitis,
polio, typhoid, and what other disease?
Cholera
How many fusible plugs are in a 1 ton chlorine container?
6
What is the proper amount of oxygen to enter a confined space?
19.5% - 23.5%
Which safety procedure can prevent accidental re-energizing of electrical energy while maintaining a
piece of equipment?
Use proper LO/TO procedures
If a leak of liquid chlorine occurs, one part of the liquid chlorine can expand to how many parts of
gaseous chlorine at room temperature and average barometric pressure?
457 parts of gas.
Chlorine gas is how many times heavier than air?
2.5 times
Methane gas is lighter than air
True
A pump's seal water pressure should be set at
5 to 10 psi more than the pump operating discharge pressure
What does a gradual increase in the bearing temperature of a centrifugal blower indicate?
There is a problem with the bearing lubrication or connection
How often should the packing on a gate valve be replaced?
As required
What is surging in a centrifugal blower?
When the blower's discharge pressure is less than the aeration system's backpressure
Pumps are often required to bring wastewater into a treatment plant. What types of pumps are typically
used to lift influent wastewater?
Centrifugal
3|Page
