Water Distribution Network Design and Installation: Master the Basics

Question 1

The Darcy-Weisbach equation is used to determine:

Accepted Answer

Pressure drop in a pipe

Answer

Pipe size

Answer

Flow rate

Answer

Water quality

Question 2

In residential areas, which pipe material is most commonly used for water distribution networks?

Accepted Answer

CPVC

Answer

Galvanized steel

Answer

Copper

Answer

Polybutylene

Question 3

Which factor is the primary determinant of a water distribution pipe's size?

Accepted Answer

Flow rate

Answer

Length of the pipe

Answer

Pressure drop

Answer

Material of the pipe

Question 4

In a water distribution network, what is the primary purpose of a pressure-reducing valve?

Accepted Answer

Reduce system pressure

Answer

Increase system pressure

Answer

Prevent backflow

Answer

Control flow rate

Question 5

When disinfecting a newly installed water distribution pipe, which method is commonly used?

Accepted Answer

Chlorination

Answer

Boiling

Answer

Ultraviolet radiation

Answer

Ozonation

Question 6

Which of the following is not an advantage of using polyethylene (PE) pipes in water distribution systems?

Accepted Answer

Exceptional strength

Answer

Flexibility

Answer

Corrosion resistance

Answer

Low cost

Question 7

In a water distribution system, what is the main function of a backflow preventer?

Accepted Answer

Prevent water from flowing in reverse direction

Answer

Control pressure

Answer

Disinfect water

Answer

Reduce sediment

Question 8

According to fire protection guidelines, what is the recommended water flow rate for a residential fire hydrant?

Accepted Answer

750 gallons per minute (gpm)

Answer

500 gallons per minute (gpm)

Answer

1000 gallons per minute (gpm)

Answer

1250 gallons per minute (gpm)

Question 9

When designing water distribution networks, which factor is most crucial in determining the appropriate pipe diameter?

Accepted Answer

Flow rate needed to meet demand

Answer

Pipe length

Answer

Pipe material type

Answer

System pressure

Question 10

Which type of pipe material is commonly used for high-pressure water distribution mains due to its strength and durability?

Accepted Answer

Ductile iron

Answer

Polyethylene (PE)

Answer

Polyvinyl chloride (PVC)

Answer

Copper

Question 11

What is the formula used to calculate the velocity of water flowing through a pipe?

Accepted Answer

V = Q/A

Answer

V = A/Q

Answer

V = PQ

Answer

V = Q^2/A

Question 12

Which type of valve is primarily used to isolate sections of a water distribution network for maintenance or repairs?

Accepted Answer

Gate valve

Answer

Ball valve

Answer

Check valve

Answer

Pressure reducing valve

Question 13

What is the main purpose of a backflow preventer in a water distribution system?

Accepted Answer

To prevent contaminated water from flowing back into the clean water supply

Answer

To increase water pressure throughout the system

Answer

To reduce water leaks and conserve water

Answer

To improve the taste and quality of the water

Question 14

Which step is NOT part of preparing a trench for installing water distribution pipes?

Accepted Answer

Backfilling the trench around the pipe

Answer

Leveling the trench bottom

Answer

Providing a sand bed for the pipe

Answer

Compacting the soil around the pipe

Question 15

Which pipe material is known for its high durability and resistance to corrosion, making it suitable for underground water distribution networks?

Accepted Answer

Ductile iron pipe

Answer

PVC pipe

Answer

Copper pipe

Question 16

The Hazen-Williams equation primarily calculates:

Accepted Answer

Head loss in a pipe

Answer

Water pressure

Answer

Flow velocity

Answer

Pipe diameter

Question 17

Which pipeline installation method involves excavating a trench and directly placing the pipe in the ground?

Accepted Answer

Direct burial

Answer

Horizontal directional drilling

Answer

Bore and jack

Answer

Auger boring

Question 18

The primary purpose of a fire hydrant in a water distribution network is to:

Accepted Answer

Provide water for firefighting

Answer

Control water flow

Answer

Reduce water pressure

Question 19

When selecting pipe material, which of the following factors should NOT be taken into consideration?

Accepted Answer

Pipe color

Answer

Pipe diameter

Answer

Water quality

Answer

Corrosion resistance

Question 20

In designing a water main, the most critical factor to consider is:

Accepted Answer

Peak water demand

Answer

Pipe material

Answer

Pipe length

Answer

Pipe installation depth

Question 21

The primary function of a water meter in a water distribution network is to:

Accepted Answer

Measure water consumption

Answer

Protect the system from backflow

Answer

Store water in emergencies

Answer

Regulate water flow

Question 22

For water distribution networks in cold climates, a primary design consideration is to:

Accepted Answer

Prevent pipe freezing

Answer

Increase pipe diameter

Answer

Reduce flow velocity

Answer

Use corrosion-resistant materials