TCEQ CLASS D WATER LICENSE MINNESOTA EXAM
QUESTION WITH SOLUTIONS A+ 2025
After a new water main is installed and pressure is tested, it should be? - Filled with a
solution of 25 ppm to 50 ppm free chlorine for at least 24 hours before flushing
The minimum horizontal distance allowed between waterman and sanitary sewer is - 10
feet
The health department requires a minimum of how much free chlorine residual at distant
points of the ditribution system? - 0.2 ppm
A PH reading of 2 means the water is: - Acidic
vent openings on reservoirs and clear wells should be: - Screened
How many pipe diameters should a meter be located in relationship to elbows or
fittings? - Three pipe diameters upstream, five pipe diameters downstream
chlorine leaks can be detected around a chlorine cylinder by the use of: - Ammonia
The intake of a forced ventilation system for a chlorinator room should be located: -
Near the floors
If an operator hears a pinging sound coming from a pump what is the probable cause? -
Cavitation
A main break may cause low pressure in the distribution system which in turn may
result in: - Contamination of the system by backsiphonage
Chemicals added to groundwater supply should be added - after the check valve
What is the minimum pipe diameter for fire protection is: - 6 inches
Sodium thiosulfate is used to - Neutralize chlorine residuals
distribution system pressure during a fire should never drop below: - 20 PSI
High nitrates contents in water can affect: - Infants
The state agency that regulates public water systems is: - Minnesota department of
Health
A connection between non potable and potable water supple is called: - Cross
connection
, The ______ is the most positive back flow prevention measure - Air Gap
The feet of drawdown in a well is the distance between the static groundwater level and
the pumping level - True
A National Secondary Drinking Water Regulation is a legally-enforceable standard that
applies to public water systems - false
The greatest amount of particular contaiminant allowed in drinking water by EPA is
known as: - Maximum contaminant Level
Water samples collected for coliform bacteria monitoring must be analyzed by the
laboratory within: - 30 hours
Current regulations require that id a routine coliform bacteria sample is positive the
water supplier must take _____ more samples - Four- New standard is 5
Increased lead levels in water can cause impaired mental function in children and
increased blood pressure or kidney problems in adults - True
For community water supplies, the well casing vent shall end at least ____ above the
finished floor elevation - 18 inches
Sodium hypochlorite is commonly called: - Liquid bleach
A gas chlorine room shall be enclosed and separated from other operating areas.
WHAT NINE THINGS MUST IT HAVE? - - Shatterproof glass
- vents
- eyewash stations
- danger signs
-emergency Kits
-MSDS
-Vaccuum ejector
-lead gasket
- scale
- fusible plug
- cylinder
-main valve
Chlorine gas cylinders have a ___ which is set to melt at 158 F to 165 F to prevent
buildup of pressure and the possibilty of rupture due to a fire or high surrounding
temptures - Fusible plug
To prevent dental decay _____ is added to drinking water - Fluoride
QUESTION WITH SOLUTIONS A+ 2025
After a new water main is installed and pressure is tested, it should be? - Filled with a
solution of 25 ppm to 50 ppm free chlorine for at least 24 hours before flushing
The minimum horizontal distance allowed between waterman and sanitary sewer is - 10
feet
The health department requires a minimum of how much free chlorine residual at distant
points of the ditribution system? - 0.2 ppm
A PH reading of 2 means the water is: - Acidic
vent openings on reservoirs and clear wells should be: - Screened
How many pipe diameters should a meter be located in relationship to elbows or
fittings? - Three pipe diameters upstream, five pipe diameters downstream
chlorine leaks can be detected around a chlorine cylinder by the use of: - Ammonia
The intake of a forced ventilation system for a chlorinator room should be located: -
Near the floors
If an operator hears a pinging sound coming from a pump what is the probable cause? -
Cavitation
A main break may cause low pressure in the distribution system which in turn may
result in: - Contamination of the system by backsiphonage
Chemicals added to groundwater supply should be added - after the check valve
What is the minimum pipe diameter for fire protection is: - 6 inches
Sodium thiosulfate is used to - Neutralize chlorine residuals
distribution system pressure during a fire should never drop below: - 20 PSI
High nitrates contents in water can affect: - Infants
The state agency that regulates public water systems is: - Minnesota department of
Health
A connection between non potable and potable water supple is called: - Cross
connection
, The ______ is the most positive back flow prevention measure - Air Gap
The feet of drawdown in a well is the distance between the static groundwater level and
the pumping level - True
A National Secondary Drinking Water Regulation is a legally-enforceable standard that
applies to public water systems - false
The greatest amount of particular contaiminant allowed in drinking water by EPA is
known as: - Maximum contaminant Level
Water samples collected for coliform bacteria monitoring must be analyzed by the
laboratory within: - 30 hours
Current regulations require that id a routine coliform bacteria sample is positive the
water supplier must take _____ more samples - Four- New standard is 5
Increased lead levels in water can cause impaired mental function in children and
increased blood pressure or kidney problems in adults - True
For community water supplies, the well casing vent shall end at least ____ above the
finished floor elevation - 18 inches
Sodium hypochlorite is commonly called: - Liquid bleach
A gas chlorine room shall be enclosed and separated from other operating areas.
WHAT NINE THINGS MUST IT HAVE? - - Shatterproof glass
- vents
- eyewash stations
- danger signs
-emergency Kits
-MSDS
-Vaccuum ejector
-lead gasket
- scale
- fusible plug
- cylinder
-main valve
Chlorine gas cylinders have a ___ which is set to melt at 158 F to 165 F to prevent
buildup of pressure and the possibilty of rupture due to a fire or high surrounding
temptures - Fusible plug
To prevent dental decay _____ is added to drinking water - Fluoride
