Fire Apparatus Driver/Operator Chapter 4

What is the weight of water in its liquid form per gallon?

8.34 pounds

What is the amount of particulate matter suspended in water?

Turbidity

Where are the water source, treatment plant, and storage facilities located in a gravity-feed system?

On high ground

What are the three components of a municipal water system?

Water source, treatment plant, distribution system Signup and view all the answers

What is the recommended minimum operating pressure for hydrants in the distribution system?

20 psi Signup and view all the answers

What is the range of system pressures at the delivery point?

20 to 80 psi Signup and view all the answers

What do primary feeders in a municipal water supply system do?

Carry large quantities of water to a section of the town Signup and view all the answers

What is the function of secondary feeders in a municipal water supply system?

Distribute water to a smaller area Signup and view all the answers

What type of energy does water have when it is not moving in a municipal water supply system?

Potential energy Signup and view all the answers

In which direction is fluid pressure exerted on any surface?

Perpendicular to the surface Signup and view all the answers

What happens to the pressure of a liquid in an open vessel as the depth of the liquid increases?

It increases proportionally Signup and view all the answers

How is the pressure applied to a confined liquid from outside of the container transmitted?

Equally in all directions Signup and view all the answers

What is residual pressure in a water distribution system?

The amount of pressure that remains in the system when the water is flowing Signup and view all the answers

What is the minimum usable residual pressure in a water distribution system?

20 psi Signup and view all the answers

What causes water hammer in a municipal water supply system?

A pressure surge or wave caused by the kinetic energy of a fluid in motion when it is forced to stop or change direction suddenly Signup and view all the answers

What happens to atmospheric pressure as altitude increases?

It decreases by approximately 0.5 psi for every 1,000 ft above sea level Signup and view all the answers

What does normal operating pressure refer to in a water distribution system?

The amount of water pressure during a period of normal consumption Signup and view all the answers

What type of hydrants are used in climates where temperatures can be expected to fall below the freezing?

Dry barrel Signup and view all the answers

What is the recommended distance between the center of a hose outlet on a hydrant and the finished grade (ground) according to NFPA 291?

18 inches Signup and view all the answers

When should hydrant flow testing be conducted?

During peak flow times Signup and view all the answers

In which areas are hydrants usually placed every 300 ft?

High-value commercial and industrial areas Signup and view all the answers

What is the typical distance between hydrants in residential areas?

500 ft Signup and view all the answers