Class C Water Operator License Exam UPDATED ACTUAL Questions and
CORRECT Answers
1. Ammonia mixed with chlorine gas creates a white smoke
2. The most difficult part of a water distribution opera- furnish a continuous sup-
tor's job. ply
3. Physical connection between a safe and potentially cross connection
unsafe water source.
4. A distribution system is a looped system
5. Dead end mains should be flushed every month
6. Excess nitrate causes a condition called blue baby syndrome
7. Water hardness is caused by calcium and magnesium
8. Sewer mains should be ft away from water mains. 9
9. Water with a pH less than 7 is considered to be acidic
10. Bacti records are kept for yrs and chemical records 5, 10
are kept for yrs.
11. Bacti samples have to be returned to the lab within 30
hrs of the collection time.
12. Color in the water supply should be less than 15
units.
13. Chlorine is times heavier than air. 2.5
14. 90% of underground pipe failures are related to im- backfill and bedding
proper
15. 2
, The spoil bank should be located at least ft away
from the ditch.
16. The following minimum residuals is mg/L for .2, .5
free chlorine and mg/L for total chlorine.
17. Public opinion of the water utility is at a stand- never
still.
18. A bacti sample should be taken every ft of pipe. 1000
19. The most common collection point for a bacti sample outside the house
is the water tap .
20. A standpipe is considered ground storage unless it 80, service connection
exceeds ft above the highest .
21. protection is the electrochemical method for cathodic, corrosion
preventing of metal tanks.
22. The is the only cross connection control method air gap, tceq
approved by .
23. on a pipeline depend on the or coefficient friction loss, c factor
of pipe roughness.
24. occurs whenever there is a in the water hammer, sudden
velocity or direction of water flow. change
25. The water pressure required by the rules and minimum, 20
regulations is psi under any and all conditions.
26. 100, 150, 200 and 250 are approved classes of working pressure
.
CORRECT Answers
1. Ammonia mixed with chlorine gas creates a white smoke
2. The most difficult part of a water distribution opera- furnish a continuous sup-
tor's job. ply
3. Physical connection between a safe and potentially cross connection
unsafe water source.
4. A distribution system is a looped system
5. Dead end mains should be flushed every month
6. Excess nitrate causes a condition called blue baby syndrome
7. Water hardness is caused by calcium and magnesium
8. Sewer mains should be ft away from water mains. 9
9. Water with a pH less than 7 is considered to be acidic
10. Bacti records are kept for yrs and chemical records 5, 10
are kept for yrs.
11. Bacti samples have to be returned to the lab within 30
hrs of the collection time.
12. Color in the water supply should be less than 15
units.
13. Chlorine is times heavier than air. 2.5
14. 90% of underground pipe failures are related to im- backfill and bedding
proper
15. 2
, The spoil bank should be located at least ft away
from the ditch.
16. The following minimum residuals is mg/L for .2, .5
free chlorine and mg/L for total chlorine.
17. Public opinion of the water utility is at a stand- never
still.
18. A bacti sample should be taken every ft of pipe. 1000
19. The most common collection point for a bacti sample outside the house
is the water tap .
20. A standpipe is considered ground storage unless it 80, service connection
exceeds ft above the highest .
21. protection is the electrochemical method for cathodic, corrosion
preventing of metal tanks.
22. The is the only cross connection control method air gap, tceq
approved by .
23. on a pipeline depend on the or coefficient friction loss, c factor
of pipe roughness.
24. occurs whenever there is a in the water hammer, sudden
velocity or direction of water flow. change
25. The water pressure required by the rules and minimum, 20
regulations is psi under any and all conditions.
26. 100, 150, 200 and 250 are approved classes of working pressure
.
