Water distribution Exam Questions and
Answers 100% Solved
A fluids resistance to moving through the piping system? - ANSWER-flow resistance
Name four categories of water supply systems - ANSWER-1. surface water
2. ground water
3. purchased water
4. rural water .... supply systems
Name three classifications of distribution system layouts - ANSWER-1. arterial loop
system
2. grid system
3. tree system
Where in the distribution system should shut off valves be? - ANSWER-At regular
intervals and at all branches from the arterial main. Also, where mains intersect in a
grid , at least two (better 3) of the branch lines should have valves. The distribution
system should be planned so that most of the flow will be maintained if any one
section of the system is taken out of service.
What is the minimum static pressure required at all fire hydrants? - ANSWER-35 psi/
or higher
What are four general types of piping systems used by water utilities? - ANSWER-1.
transmission lines(from source to treatment)
2. in-plant piping systems(pipes located in pump stations and treatment plants)
3. distribution mains
4. service lines
What are four principle uses of valves? - ANSWER-1. start and stop flow
2. regulate pressure and throttle flow
3. prevent back flow
4. relieve pressure
Name 6 out of 10 types of water utility valves - ANSWER-1. gate 2. globe(ball) 3.
needle 4. relief 5. butterfly
6. air and vacuum relief 7.check 8. rotary 9. pinch
10. diaphragm
A valve controls flow through one of four basic closure methods. Describe one. -
ANSWER-1. A disc or plug moves against or into an opening
2. A flat, cylindrical or spherical surface slides across an opening.
3. A disc or ellipse rotates across the diameter of a pipe or circular element.
4. A flexible material moves into a flow passage.
Answers 100% Solved
A fluids resistance to moving through the piping system? - ANSWER-flow resistance
Name four categories of water supply systems - ANSWER-1. surface water
2. ground water
3. purchased water
4. rural water .... supply systems
Name three classifications of distribution system layouts - ANSWER-1. arterial loop
system
2. grid system
3. tree system
Where in the distribution system should shut off valves be? - ANSWER-At regular
intervals and at all branches from the arterial main. Also, where mains intersect in a
grid , at least two (better 3) of the branch lines should have valves. The distribution
system should be planned so that most of the flow will be maintained if any one
section of the system is taken out of service.
What is the minimum static pressure required at all fire hydrants? - ANSWER-35 psi/
or higher
What are four general types of piping systems used by water utilities? - ANSWER-1.
transmission lines(from source to treatment)
2. in-plant piping systems(pipes located in pump stations and treatment plants)
3. distribution mains
4. service lines
What are four principle uses of valves? - ANSWER-1. start and stop flow
2. regulate pressure and throttle flow
3. prevent back flow
4. relieve pressure
Name 6 out of 10 types of water utility valves - ANSWER-1. gate 2. globe(ball) 3.
needle 4. relief 5. butterfly
6. air and vacuum relief 7.check 8. rotary 9. pinch
10. diaphragm
A valve controls flow through one of four basic closure methods. Describe one. -
ANSWER-1. A disc or plug moves against or into an opening
2. A flat, cylindrical or spherical surface slides across an opening.
3. A disc or ellipse rotates across the diameter of a pipe or circular element.
4. A flexible material moves into a flow passage.
