Minnesota Class D Water Exam 163 QUESTIONS AND
ANSWERS NEW EDITION UPDATED
According to the Safe Drinking Water Act the basic defini on of a public water supply system is
any water system that supplies water for human consump on that serves: - Ans 15 service
connec on 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 u lizes - Ans color change
What are two main causes of harness in water? - Ans Calcium and magnesium
Which source of water has the greatest natural protec on from bacterial contamina on? - Ans
deep well in gravel
Which of the following terms refers to excessive internal pressure which may be several mes
the normal opera ng pressure and can seriously damage hydropnema c 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 informa on is improper - Ans
Sampling
Polyphosphates should be fed at which point? - Ans Before the addi on of chlorine
A8er a new water main is installed and pressure is tested, it should be? - Ans Filled with a
solu on 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 ditribu on 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
ANSWERS NEW EDITION UPDATED
According to the Safe Drinking Water Act the basic defini on of a public water supply system is
any water system that supplies water for human consump on that serves: - Ans 15 service
connec on 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 u lizes - Ans color change
What are two main causes of harness in water? - Ans Calcium and magnesium
Which source of water has the greatest natural protec on from bacterial contamina on? - Ans
deep well in gravel
Which of the following terms refers to excessive internal pressure which may be several mes
the normal opera ng pressure and can seriously damage hydropnema c 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 informa on is improper - Ans
Sampling
Polyphosphates should be fed at which point? - Ans Before the addi on of chlorine
A8er a new water main is installed and pressure is tested, it should be? - Ans Filled with a
solu on 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 ditribu on 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
