Water Distribution Actual Exam Questions and
Answers Verified 100% Correct
Centrifugal pumps must be ______ before being used. - ANSWER Primed
On a Centrifugal pump where should the check valve be? - ANSWER Discharge side
of the pump
Meter registers may be_________ or__________ driven. - ANSWER Mechanical or
Magnetically
Service meters are called? - ANSWER Totalizing Water Service Meters
What is the ACCURACY of a Small Meter? - ANSWER 98.5 - 101.5
What is the ACCURACY of a large meter? - ANSWER 97- 103
How much HEAD LOSS in a small meters? - ANSWER 15 PSI
How much HEAD LOSS in a Larger meters? - ANSWER 20 PSI
Velocity type meter are known as? - ANSWER Current Meter
What valve is BEST to regulate flow? - ANSWER Globe Vavle?
,How often should SMALL METERS be tested? - ANSWER Every 5 to 10 years
How often should LARGE METERS BE tested? - ANSWER Every 1 to 4 years
How often do Residential Dual Check have to be changed? - ANSWER Should be
changed every 5 years
What is used to test a dual check? - ANSWER Manometer Tube
What is the BEST form of backflow protection? - ANSWER Air Gap
What is the BEST MECHANICAL Backflow prevention? - ANSWER R.P.
What is used to test an R.P. - ANSWER Differential Tubes
What does an R.P.Z. consist of? - ANSWER 2 Spring and a relief port
What are the R.P.Z. spring weights? - ANSWER #1 Spring
5lbs #2 Spring 1lb (Buffer between 3lbs) #3 Spring 2lbs
When testing an R.P.Z. which valvemust be shut? - ANSWER #2
Name 2 water color problems and what cause them. - ANSWER Red- Iron
Black- Manganese
, What formula is used to find the smoothness of a pipe? ( - ANSWER The Hassen William
Formula (C Factor of a pipe)
What is the C Factor of Poly? - ANSWER 150 (Poly has the highest C Factor)
What is the C Factor of PVC? - ANSWER 140
For a water distribution you are required to have: - ANSWER • 50% Fire Flow
• 25% Average
• 25% Peak
How many consecutive hours for fire? - ANSWER 4 consecutive hours
When are the OFF PEAK hours? - ANSWER Between 10pm and 6am
3 What Quality problems - ANSWER •Microbiological
•Chemical
•Physical
3 Major Hydraulic Concerns - ANSWER •Whether water will flow
•In what direction will it flow
•Adequate Pressure
Hydrant has 4 Major parts: - ANSWER •Inlet pipe connection
•Main Valve
Answers Verified 100% Correct
Centrifugal pumps must be ______ before being used. - ANSWER Primed
On a Centrifugal pump where should the check valve be? - ANSWER Discharge side
of the pump
Meter registers may be_________ or__________ driven. - ANSWER Mechanical or
Magnetically
Service meters are called? - ANSWER Totalizing Water Service Meters
What is the ACCURACY of a Small Meter? - ANSWER 98.5 - 101.5
What is the ACCURACY of a large meter? - ANSWER 97- 103
How much HEAD LOSS in a small meters? - ANSWER 15 PSI
How much HEAD LOSS in a Larger meters? - ANSWER 20 PSI
Velocity type meter are known as? - ANSWER Current Meter
What valve is BEST to regulate flow? - ANSWER Globe Vavle?
,How often should SMALL METERS be tested? - ANSWER Every 5 to 10 years
How often should LARGE METERS BE tested? - ANSWER Every 1 to 4 years
How often do Residential Dual Check have to be changed? - ANSWER Should be
changed every 5 years
What is used to test a dual check? - ANSWER Manometer Tube
What is the BEST form of backflow protection? - ANSWER Air Gap
What is the BEST MECHANICAL Backflow prevention? - ANSWER R.P.
What is used to test an R.P. - ANSWER Differential Tubes
What does an R.P.Z. consist of? - ANSWER 2 Spring and a relief port
What are the R.P.Z. spring weights? - ANSWER #1 Spring
5lbs #2 Spring 1lb (Buffer between 3lbs) #3 Spring 2lbs
When testing an R.P.Z. which valvemust be shut? - ANSWER #2
Name 2 water color problems and what cause them. - ANSWER Red- Iron
Black- Manganese
, What formula is used to find the smoothness of a pipe? ( - ANSWER The Hassen William
Formula (C Factor of a pipe)
What is the C Factor of Poly? - ANSWER 150 (Poly has the highest C Factor)
What is the C Factor of PVC? - ANSWER 140
For a water distribution you are required to have: - ANSWER • 50% Fire Flow
• 25% Average
• 25% Peak
How many consecutive hours for fire? - ANSWER 4 consecutive hours
When are the OFF PEAK hours? - ANSWER Between 10pm and 6am
3 What Quality problems - ANSWER •Microbiological
•Chemical
•Physical
3 Major Hydraulic Concerns - ANSWER •Whether water will flow
•In what direction will it flow
•Adequate Pressure
Hydrant has 4 Major parts: - ANSWER •Inlet pipe connection
•Main Valve
