Class C Water Operator License Exam
1. _____ all shoring from the top down and _____ from the bottom up:
A) Remove, install
B) Install, remove
C) Build, destroy
D) Place, take
Answer: B) Install, remove
2. ______ is the last barrier between the public and giardia or cryptosporidium:
A) Chlorination
B) Sedimentation
C) Filtration
D) Coagulation
Answer: C) Filtration
3. ______ is used to anchor pipe bends:
A) Steel
B) Wood
C) Concrete
D) Plastic
Answer: C) Concrete
4. _______ on a pipeline depend on the _____ or coefficient of pipe roughness:
A) Pressure loss, friction factor
,B) Friction loss, C factor
C) Water hammer, velocity
D) Flow rate, diameter
Answer: B) Friction loss, C factor
5. ________ protection is the electrochemical method for preventing ________ of
metal tanks:
A) Anodic, rusting
B) Cathodic, corrosion
C) Chemical, oxidation
D) Physical, degradation
Answer: B) Cathodic, corrosion
6. __________ occurs whenever there is a ______ in the velocity or direction of
water flow:
A) Cavitation, change
B) Turbulence, shift
C) Water hammer, sudden change
D) Pressure surge, gradual change
Answer: C) Water hammer, sudden change
7. _____% of all the water on earth is saltwater:
A) 85%
B) 90%
C) 95%
D) 97%
,Answer: D) 97%
8. _____% of the earth's surface is ocean:
A) 50%
B) 65%
C) 75%
D) 85%
Answer: C) 75%
9. 100, 150, 200 and 250 are approved classes of:
A) Pipe diameter
B) Working pressure
C) Flow rate
D) Pipe length
Answer: B) Working pressure
10. 5/8 meters need to be tested at least every _____ to _______ yrs:
A) 3 to 5 years
B) 5 to 10 years
C) 10 to 15 years
D) 15 to 20 years
Answer: B) 5 to 10 years
11. 90% of underground pipe failures are related to improper:
A) Installation
, B) Material selection
C) Backfill and bedding
D) Welding
Answer: C) Backfill and bedding
12. A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have
approved ____:
A) 20 feet, barriers
B) 25 feet, shoring
C) 30 feet, fencing
D) 35 feet, signage
Answer: B) 25 feet, shoring
13. A bacti sample should be taken every ____ft of pipe:
A) 500 ft
B) 750 ft
C) 1000 ft
D) 1500 ft
Answer: C) 1000 ft
14. A commonly used method to test for chlorine residual in water is called the ____
method:
A) Titration
B) DPD
C) Colorimetric
D) Spectrophotometric
1. _____ all shoring from the top down and _____ from the bottom up:
A) Remove, install
B) Install, remove
C) Build, destroy
D) Place, take
Answer: B) Install, remove
2. ______ is the last barrier between the public and giardia or cryptosporidium:
A) Chlorination
B) Sedimentation
C) Filtration
D) Coagulation
Answer: C) Filtration
3. ______ is used to anchor pipe bends:
A) Steel
B) Wood
C) Concrete
D) Plastic
Answer: C) Concrete
4. _______ on a pipeline depend on the _____ or coefficient of pipe roughness:
A) Pressure loss, friction factor
,B) Friction loss, C factor
C) Water hammer, velocity
D) Flow rate, diameter
Answer: B) Friction loss, C factor
5. ________ protection is the electrochemical method for preventing ________ of
metal tanks:
A) Anodic, rusting
B) Cathodic, corrosion
C) Chemical, oxidation
D) Physical, degradation
Answer: B) Cathodic, corrosion
6. __________ occurs whenever there is a ______ in the velocity or direction of
water flow:
A) Cavitation, change
B) Turbulence, shift
C) Water hammer, sudden change
D) Pressure surge, gradual change
Answer: C) Water hammer, sudden change
7. _____% of all the water on earth is saltwater:
A) 85%
B) 90%
C) 95%
D) 97%
,Answer: D) 97%
8. _____% of the earth's surface is ocean:
A) 50%
B) 65%
C) 75%
D) 85%
Answer: C) 75%
9. 100, 150, 200 and 250 are approved classes of:
A) Pipe diameter
B) Working pressure
C) Flow rate
D) Pipe length
Answer: B) Working pressure
10. 5/8 meters need to be tested at least every _____ to _______ yrs:
A) 3 to 5 years
B) 5 to 10 years
C) 10 to 15 years
D) 15 to 20 years
Answer: B) 5 to 10 years
11. 90% of underground pipe failures are related to improper:
A) Installation
, B) Material selection
C) Backfill and bedding
D) Welding
Answer: C) Backfill and bedding
12. A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have
approved ____:
A) 20 feet, barriers
B) 25 feet, shoring
C) 30 feet, fencing
D) 35 feet, signage
Answer: B) 25 feet, shoring
13. A bacti sample should be taken every ____ft of pipe:
A) 500 ft
B) 750 ft
C) 1000 ft
D) 1500 ft
Answer: C) 1000 ft
14. A commonly used method to test for chlorine residual in water is called the ____
method:
A) Titration
B) DPD
C) Colorimetric
D) Spectrophotometric
