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?

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

FL varies in direct proportion to what?

<p>The length of the hose (D)</p> Signup and view all the answers

What happens to FL when the flow is doubled?

<p>FL is quadrupled (C)</p> Signup and view all the answers

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

<p>0.434 psi (B)</p> Signup and view all the answers

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

<p>5 psi (B)</p> Signup and view all the answers

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

<p>25 psi (D)</p> Signup and view all the answers

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

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

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

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

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

<p>In 12-14 ft increments (A)</p> Signup and view all the answers

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

<p>Minus 10 method (B)</p> Signup and view all the answers

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

<p>$FL = Q^2/3$ (A)</p> 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?

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

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