MINNESOTA CLASS D WATER EXAM 163 QUESTIONS
AND ANSWERS NEW EDITION UPDATED
According to the Safe Drinking Water Act the basic definition of a public water supply system is
any water system that supplies water for human consumption that serves: - Ans 15 service
connection or over 25 persons for over 60 days a year
What federal law regulates public water supplies? - Ans Safe Drinking Water Act
What cause water to move through pores in soil and rocks ? - Ans Gravity
What are disease producing bacteria called? - Ans Pathogenic
A presence/absence coliform test utilizes - Ans color change
What are two main causes of harness in water? - Ans Calcium and magnesium
Which source of water has the greatest natural protection from bacterial contamination? - Ans
deep well in gravel
Which of the following terms refers to excessive internal pressure which may be several times
the normal operating pressure and can seriously damage hydropnematic tanks, valves, and
piping network. - Ans water hammer
What are the two most important safety concerns when entering a confined space? - Ans
hazardous gases and oxygen deficiency
, what piece of safety equipement must an operator wear when entering a confined space? -
Ans Harness
Which document provides a profile of hazardous substances? - Ans MSDS
What safety measure must ab operator follow prior to working on electrical equipment? - Ans
Lock out Tag out all electrical switches
what is the correct procedure for mixing acid an water - Ans Acid is ADDED SLOWLY to water
The major source of error when obtaining water quality information is improper - Ans
Sampling
Polyphosphates should be fed at which point? - Ans Before the addition of chlorine
After a new water main is installed and pressure is tested, it should be? - Ans 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 - Ans 10
feet
The health department requires a minimum of how much free chlorine residual at distant
points of the ditribution system? - Ans 0.2 ppm
A PH reading of 2 means the water is: - Ans Acidic
vent openings on reservoirs and clear wells should be: - Ans Screened
AND ANSWERS NEW EDITION UPDATED
According to the Safe Drinking Water Act the basic definition of a public water supply system is
any water system that supplies water for human consumption that serves: - Ans 15 service
connection or over 25 persons for over 60 days a year
What federal law regulates public water supplies? - Ans Safe Drinking Water Act
What cause water to move through pores in soil and rocks ? - Ans Gravity
What are disease producing bacteria called? - Ans Pathogenic
A presence/absence coliform test utilizes - Ans color change
What are two main causes of harness in water? - Ans Calcium and magnesium
Which source of water has the greatest natural protection from bacterial contamination? - Ans
deep well in gravel
Which of the following terms refers to excessive internal pressure which may be several times
the normal operating pressure and can seriously damage hydropnematic tanks, valves, and
piping network. - Ans water hammer
What are the two most important safety concerns when entering a confined space? - Ans
hazardous gases and oxygen deficiency
, what piece of safety equipement must an operator wear when entering a confined space? -
Ans Harness
Which document provides a profile of hazardous substances? - Ans MSDS
What safety measure must ab operator follow prior to working on electrical equipment? - Ans
Lock out Tag out all electrical switches
what is the correct procedure for mixing acid an water - Ans Acid is ADDED SLOWLY to water
The major source of error when obtaining water quality information is improper - Ans
Sampling
Polyphosphates should be fed at which point? - Ans Before the addition of chlorine
After a new water main is installed and pressure is tested, it should be? - Ans 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 - Ans 10
feet
The health department requires a minimum of how much free chlorine residual at distant
points of the ditribution system? - Ans 0.2 ppm
A PH reading of 2 means the water is: - Ans Acidic
vent openings on reservoirs and clear wells should be: - Ans Screened
