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Fire Apparatus Driver/Operator Chapter 7

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Questions and Answers

What is the ultimate goal of the driver in fire service hydraulics?

To calculate theoretical hydraulics
To provide the correct flow to the nozzle (correct)
To minimize friction loss
To study water characteristics

What is the total pressure needed to overcome all friction, appliance, and elevation loss in fireground operations?

Scientific hydraulics
Pump discharge pressure (correct)
Friction loss
Nozzle pressure

What is the pressure required at the nozzle for fog nozzles traditionally?

80 psi
50 psi
100 psi (correct)
120 psi

What is nozzle reaction in fireground operations?

The opposing reaction that occurs as water is expelled from the nozzle (B) Signup and view all the answers

FL varies in direct proportion to what?

The length of the hose (D) Signup and view all the answers

What happens to FL when the flow is doubled?

FL is quadrupled (C) Signup and view all the answers

What is the pressure exerted by water per 1 ft of water column?

0.434 psi (B) Signup and view all the answers

At what rate does the pressure change for each floor of elevation in residential structures?

5 psi (B) Signup and view all the answers

What is the appliance loss for master streams with a flow of 350 gpm or more?

25 psi (D) Signup and view all the answers

When should the PDP not exceed 200 psi as a general rule?

Unless you know the system is designed to handle the pressure (B) Signup and view all the answers

What is the purpose of pressure reducing valves in standpipe risers?

To regulate pressure when static pressures exceed 175 psi (C) Signup and view all the answers

How are high rise buildings typically spaced in terms of elevation?

In 12-14 ft increments (A) Signup and view all the answers

What method is used to determine FL in 2.5" lines only flowing 160 gpm or greater?

Minus 10 method (B) Signup and view all the answers

What is the formula for FL in a 3.5" line according to the given information?

$FL = Q^2/3$ (A) Signup and view all the answers

When should NFPA 14 require the installation of a device at the outlet to restrict or reduce the flow pressure?

When pressures while flowing exceed 100 psi (C) Signup and view all the answers

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