Minnesota Class D Water Exam Questions with Complete Solutions 2023/202

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: - Correct Answer 15 service connection or over 25 persons for over 60 days a year What federal law regulates public water supplies? - Correct Answer Safe Drinking Water Act What cause water to move through pores in soil and rocks ? - Correct Answer Gravity What are disease producing bacteria called? - Correct Answer Pathogenic A presence/absence coliform test utilizes - Correct Answer color change What are two main causes of harness in water? - Correct Answer Calcium and magnesium Which source of water has the greatest natural protection from bacterial contamination? - Correct Answer 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. - Correct Answer water hammer What are the two most important safety concerns when entering a confined space? - Correct Answer hazardous gases and oxygen deficiency what piece of safety equipement must an operator wear when entering a confined space? - Correct Answer Harness Which document provides a profile of hazardous substances? - Correct Answer MSDS What safety measure must ab operator follow prior to working on electrical equipment? - Correct Answer Lock out Tag out all electrical switches what is the correct procedure for mixing acid an water - Correct Answer Acid is ADDED SLOWLY to water The major source of error when obtaining water quality information is improper - Correct Answer Sampling Polyphosphates should be fed at which point? - Correct Answer Before the addition of chlorine