MINNESOTA CLASS D WATER EXAM UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

MINNESOTA CLASS D WATER EXAM UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. 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:
Answer:
15 service connection or over 25 persons for over 60 days a year

Question:
2. What federal law regulates public water supplies?
Answer:
Safe Drinking Water Act

Question:
3. What cause water to move through pores in soil and rocks ?
Answer:
Gravity

Question:
4. What are disease producing bacteria called?
Answer:
Pathogenic

Question:
5. A presence/absence coliform test utilizes
Answer:
color change

Question:
6. What are two main causes of harness in water?
Answer:
Calcium and magnesium

Question:
7. Which source of water has the greatest natural protection from bacterial contamination?
Answer:
deep well in gravel

Question:
8. 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.
Answer:
water hammer

,Question:
9. What are the two most important safety concerns when entering a confined space?
Answer:
hazardous gases and oxygen deficiency

Question:
10. what piece of safety equipement must an operator wear when entering a confined space?
Answer:
Harness

Question:
11. Which document provides a profile of hazardous substances?
Answer:
MSDS

Question:
12. What safety measure must ab operator follow prior to working on electrical equipment?
Answer:
Lock out Tag out all electrical switches

Question:
13. what is the correct procedure for mixing acid an water
Answer:
Acid is ADDED SLOWLY to water

Question:
14. The major source of error when obtaining water quality information is improper
Answer:
Sampling

Question:
15. Polyphosphates should be fed at which point?
Answer:
Before the addition of chlorine

Question:
16. After a new water main is installed and pressure is tested, it should be?
Answer:
Filled with a solution of 25 ppm to 50 ppm free chlorine for at least 24 hours before flushing

Question:
17. The minimum horizontal distance allowed between waterman and sanitary sewer is
Answer:
10 feet

, Question:
18. The health department requires a minimum of how much free chlorine residual at distant points of the
ditribution system?
Answer:
0.2 ppm

Question:
19. A PH reading of 2 means the water is:
Answer:
Acidic

Question:
20. vent openings on reservoirs and clear wells should be:
Answer:
Screened

Question:
21. How many pipe diameters should a meter be located in relationship to elbows or fittings?
Answer:
Three pipe diameters upstream, five pipe diameters downstream

Question:
22. chlorine leaks can be detected around a chlorine cylinder by the use of:
Answer:
Ammonia

Question:
23. The intake of a forced ventilation system for a chlorinator room should be located:
Answer:
Near the floors

Question:
24. If an operator hears a pinging sound coming from a pump what is the probable cause?
Answer:
Cavitation

Question:
25. A main break may cause low pressure in the distribution system which in turn may result in:
Answer:
Contamination of the system by backsiphonage

Question:
26. Chemicals added to groundwater supply should be added
Answer:
after the check valve