Class C Water Operator License Exam
1. Ammonia mixed with chlorine gas creates a: white smoke
2. The most difficult part of a water distribution operator's job.: furnish a
continuous supply
3. Physical connection between a safe and potentially unsafe water
source.: cross connection
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 are kept for
___yrs.: 5, 10
11. Bacti samples have to be returned to the lab within ___hrs of the
collection time.: 30
12. Color in the water supply should be less than _____ units.: 15
13. Chlorine is ______ times heavier than air.: 2.5
14. 90% of underground pipe failures are related to improper: backfill and
bedding
15. The spoil bank should be located at least ___ft away from the ditch.: 2
16. The following minimum residuals is ______mg/L for free chlorine and
____mg/L for total chlorine.: .2, .5
17. Public opinion of the water utility is _______ at a standstill.: never
18. A bacti sample should be taken every ____ft of pipe.: 1000
19. The most common collection point for a bacti sample is the water tap
_______.: outside the house
20. A standpipe is considered ground storage unless it exceeds _____ft
above the highest ________.: 80, service connection
21. ________ protection is the electrochemical method for preventing
________ of metal tanks.: cathodic, corrosion
22. The _____ is the only cross connection control method approved by
_______.: air gap, tceq
23. _______ on a pipeline depend on the _____ or coefficient of pipe
roughness.: friction loss, c factor
24. __________ occurs whenever there is a ______ in the velocity or
direction of water flow.: water hammer, sudden change
Class C
, 25. The ______ water pressure required by the rules and regulations is
____psi under any and all conditions.: minimum, 20
26 100, 150, 200 and 250 are approved classes of _____ _____.: working
pressure
27. ______ is used to anchor pipe bends.: concrete
28. A general deposit of mineral particles evenly along the inside of the pipe
is ________.: tuberculation
29. Shoring should be used if a ditch is ___ft or deeper.: 5
30. A written sample writing plan is required for _______ monitoring.:
coliform
31. Ladders should be placed every ___ft in a ditch.: 25
32. An oxygen deficient atmosphere is defined as one which contains _____
than ______ % oxygen.: less, 19.5
33. Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________.: increases, decreases
34. The operator should leave a ________ of slack in flexible tubing.:
gooseneck
35. The most common type of water meter is the ____ ____ meter.: positive
displacement
36. Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a
____ton cylinder.: 40, 1
37. The most common valve is the _______.: gate valve
38. The most commonly used fire hydrants used in distribution systems are
the _________.: dry barrel
39. Hydrants have a _____ point in case the hydrant is struck by a vehicle.:
breakaway
40. Controlling valves regulate pressure flow ____ and flow _______.: rates,
direction
41. Electricity is the preferred power source for most distribution systems
because of ______, reliability and relatively low _______.: availability, cost
42. 5/8 meters need to be tested at least every _____ to _______ yrs.: 5, 10
43. When disinfecting a water line, use ____mg/L of chlorine in the main
and let stand for ____hrs.: 50, 24
44. When pressure testing the water main, the test pressure should be
___times as great as the ________ operating pressure.: 1.5, normal
45. Distribution systems are usually laid out in ____ and/or circular designs.:
loops
46. Dead ends in a system are usually located on ____ shaped or ____
designs.: tree, grid
Class C
1. Ammonia mixed with chlorine gas creates a: white smoke
2. The most difficult part of a water distribution operator's job.: furnish a
continuous supply
3. Physical connection between a safe and potentially unsafe water
source.: cross connection
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 are kept for
___yrs.: 5, 10
11. Bacti samples have to be returned to the lab within ___hrs of the
collection time.: 30
12. Color in the water supply should be less than _____ units.: 15
13. Chlorine is ______ times heavier than air.: 2.5
14. 90% of underground pipe failures are related to improper: backfill and
bedding
15. The spoil bank should be located at least ___ft away from the ditch.: 2
16. The following minimum residuals is ______mg/L for free chlorine and
____mg/L for total chlorine.: .2, .5
17. Public opinion of the water utility is _______ at a standstill.: never
18. A bacti sample should be taken every ____ft of pipe.: 1000
19. The most common collection point for a bacti sample is the water tap
_______.: outside the house
20. A standpipe is considered ground storage unless it exceeds _____ft
above the highest ________.: 80, service connection
21. ________ protection is the electrochemical method for preventing
________ of metal tanks.: cathodic, corrosion
22. The _____ is the only cross connection control method approved by
_______.: air gap, tceq
23. _______ on a pipeline depend on the _____ or coefficient of pipe
roughness.: friction loss, c factor
24. __________ occurs whenever there is a ______ in the velocity or
direction of water flow.: water hammer, sudden change
Class C
, 25. The ______ water pressure required by the rules and regulations is
____psi under any and all conditions.: minimum, 20
26 100, 150, 200 and 250 are approved classes of _____ _____.: working
pressure
27. ______ is used to anchor pipe bends.: concrete
28. A general deposit of mineral particles evenly along the inside of the pipe
is ________.: tuberculation
29. Shoring should be used if a ditch is ___ft or deeper.: 5
30. A written sample writing plan is required for _______ monitoring.:
coliform
31. Ladders should be placed every ___ft in a ditch.: 25
32. An oxygen deficient atmosphere is defined as one which contains _____
than ______ % oxygen.: less, 19.5
33. Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________.: increases, decreases
34. The operator should leave a ________ of slack in flexible tubing.:
gooseneck
35. The most common type of water meter is the ____ ____ meter.: positive
displacement
36. Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a
____ton cylinder.: 40, 1
37. The most common valve is the _______.: gate valve
38. The most commonly used fire hydrants used in distribution systems are
the _________.: dry barrel
39. Hydrants have a _____ point in case the hydrant is struck by a vehicle.:
breakaway
40. Controlling valves regulate pressure flow ____ and flow _______.: rates,
direction
41. Electricity is the preferred power source for most distribution systems
because of ______, reliability and relatively low _______.: availability, cost
42. 5/8 meters need to be tested at least every _____ to _______ yrs.: 5, 10
43. When disinfecting a water line, use ____mg/L of chlorine in the main
and let stand for ____hrs.: 50, 24
44. When pressure testing the water main, the test pressure should be
___times as great as the ________ operating pressure.: 1.5, normal
45. Distribution systems are usually laid out in ____ and/or circular designs.:
loops
46. Dead ends in a system are usually located on ____ shaped or ____
designs.: tree, grid
Class C
