California Water Distribution Operator D2 Practice Exam Questions 1-200 WITH ANSWERS ALREADY GRADED A+

California Water Distribution Operator D2
Practice Exam Questions 1-200 WITH
ANSWERS ALREADY GRADED A+



1. The primary purpose of a water distribution system is to:
A. Collect wastewater
B. Deliver potable water to customers
C. Treat raw water
D. Store sewage
Answer: B


2. Water pressure is commonly measured in:
A. GPM
B. PSI
C. MGD
D. NTU
Answer: B


3. PSI stands for:
A. Pressure System Index
B. Pounds per Square Inch
C. Potable Supply Indicator
D. Pump Station Index

,Answer: B


4. A fire hydrant is primarily used for:
A. Measuring flow
B. Fire protection and flushing
C. Chlorination
D. Sampling only
Answer: B


5. A gate valve is typically used to:
A. Throttle flow
B. Start or stop flow
C. Measure pressure
D. Detect leaks
Answer: B


6. A water main is:
A. A customer service line
B. A principal distribution pipe
C. A sewer line
D. A treatment basin
Answer: B


7. What is the primary purpose of a storage tank?
A. Remove bacteria
B. Store water for demand and emergencies

,C. Measure chlorine
D. Reduce pH
Answer: B


8. Cross-connections are dangerous because they may:
A. Increase pressure
B. Cause contamination
C. Improve flow
D. Lower chlorine demand
Answer: B


9. Backflow is:
A. Normal flow direction
B. Reverse flow of water
C. Water treatment
D. Fire flow
Answer: B


10. A backflow prevention assembly protects:
A. Pumps
B. Potable water supplies
C. Storage tanks
D. Meters
Answer: B


11. A dead-end main should be:

, A. Ignored
B. Flushed periodically
C. Pressurized above limits
D. Permanently closed
Answer: B


12. Water hammer is caused by:
A. Bacteria growth
B. Sudden velocity changes
C. Chlorination
D. Corrosion
Answer: B


13. Residual chlorine is:
A. Unused chlorine remaining in water
B. Chlorine gas
C. Raw chlorine
D. Chlorine removed by filtration
Answer: A


14. Chlorine residual testing helps verify:
A. Pipe size
B. Disinfection effectiveness
C. Pump speed
D. Tank level
Answer: B