Fire Apparatus Driver/Operator Chapter 5
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Questions and Answers

When does cavitation occur in a fire pump system?

  • When attempting to flow water faster than it is being supplied to the pump (correct)
  • At any speed of the apparatus
  • During drafting operations only
  • When the pump pressure exceeds 200 psi

    • What is the minimum gauge pressure required for the pump and roll apparatus to pump at least 20 gpm while moving at a speed of 2 mph or less?

  • 80 psi (correct)
  • 150 psi
  • 50 psi
  • 100 psi

    • According to NFPA 1901, if a pumping system is rated at 3,000 gpm or less, it should be able to deliver water at what rate at 200 psi?

  • 80% of the rate capacity
  • 90% of the rate capacity
  • 60% of the rate capacity
  • 70% of the rate capacity (correct)

    • When drafting, a fire pump rated at less than 1500 gpm is capable of taking suction through how many feet of suction hose?

    <p>20 ft</p> Signup and view all the answers

    What type of pumps does the fire service primarily use?

    <p>Positive displacement and centrifugal pumps</p> Signup and view all the answers

    What is the function of a positive displacement pump in relation to a centrifugal pump?

    <p>It is used as a priming pump for a centrifugal pump</p> Signup and view all the answers

    What is the minimum requirement for baffling in water tanks as per NFPA 1901?

    <p>Two transverse or longitudinal vertical baffles covering at least 75% of the area</p> Signup and view all the answers

    What size should the removable pipe plugs be in cleanout sumps according to NFPA 1901?

    <p>3 inches or larger</p> Signup and view all the answers

    What type of flow does a positive displacement pump produce?

    <p>Flow by capturing a specific volume of fluid per pump revolution</p> Signup and view all the answers

    Why are positive displacement pumps considered ideal for use as priming pumps for centrifugal pumps?

    <p>They can move air or water with every revolution</p> Signup and view all the answers

    In what scenarios can positive displacement pumps be used apart from priming pumps for centrifugal pumps?

    <p>High-pressure auxiliary pumps or portable pumps</p> Signup and view all the answers

    What are the two types of positive displacement pumps?

    <p>Piston pumps and rotary pumps</p> Signup and view all the answers

    What is the most common type of fire pump used today?

    <p>Centrifugal fire pump</p> Signup and view all the answers

    In parallel/volume mode, what percentage of the pump's total capacity does each impeller pump?

    <p>50%</p> Signup and view all the answers

    What is the most common mode used on two-stage pumps?

    <p>Series/pressure mode</p> Signup and view all the answers

    To satisfy UL standards, what percentage of rated capacity must pumps produce at 200 psi for 10 minutes?

    <p>70%</p> Signup and view all the answers

    What is the minimum rate at which water must be delivered to the pump if the water tank has a capacity greater than 500 gallons?

    <p>500 gpm</p> Signup and view all the answers

    At what pressure should each discharge outlet valve be operable?

    <p>250 psi</p> Signup and view all the answers

    What size outlets are provided on a pump rated at less than 750 gpm?

    <p>One 2.5&quot; outlet</p> Signup and view all the answers

    When should the pressure relief system be installed on the pump system?

    <p>When the intakes are not valved</p> Signup and view all the answers

    What is the minimum requirement for the master pump intake gauge to measure?

    <p>30 inches Hg vacuum to at least a gauge pressure of 300 psi</p> Signup and view all the answers

    Where must the master pump discharge gauge be located in relation to the intake gauge?

    <p>Within 8&quot; of the master pump intake gauge</p> Signup and view all the answers

    What accuracy range do flowmeters generally boast?

    <p>1 - 3 percent</p> Signup and view all the answers

    What does the discharge pressure relief valve do?

    <p>Controls pressure by passing water from the discharge side of the pump back into the intake side of the pump</p> Signup and view all the answers

    What is the function of a pressure governor in a fire pump system?

    <p>Controls the engine speed which translates to pump pressure</p> Signup and view all the answers

    Where is the simplest form of power supply found?

    <p>Portable pump</p> Signup and view all the answers

    What is the maximum pressure rise the pump system must control automatically?

    <p>30 psi</p> Signup and view all the answers

    What type of lubricant must the priming system be capable of operating with?

    <p>Biodegradable nontoxic lubricant</p> Signup and view all the answers

    How does the discharge pressure relief valve control pressure?

    <p>By passing water from the discharge side of the pump back into the intake side of the pump</p> Signup and view all the answers

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