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EVT Fire Apparatus

F3 Fire Pumps & Accessories — practice test

Studying for F3 (Fire Pumps & Accessories)? Overhaul Prep has 238 verified F3 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

238F3 questions
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Sample F3 questions

Straight from the bank — answers highlighted, with the explanation underneath.

In a centrifugal fire pump operating at a constant engine (impeller) speed, as the volume of water being discharged increases, the discharge pressure will:

  1. Decrease
  2. Increase proportionally with flow
  3. Remain exactly constant
  4. Increase and then stabilize
WhyA centrifugal pump has an inverse pressure-volume relationship: pressure is highest at churn (no flow) and falls off as flow increases. Unlike a positive-displacement pump it traps no fixed volume, so pressure cannot stay constant or rise with flow.

A two-stage (series-parallel) centrifugal pump can be operated in either a volume or a pressure mode using the transfer valve. Technician A says that in the volume (parallel) position, each impeller draws from the intake and discharges together, so the pump's capacity is the sum of both impellers. Technician B says that in the pressure (series) position, the discharge of the first impeller feeds the eye of the second impeller, so the pressures of the two stages add together. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyBoth statements are correct: parallel (volume) mode adds the impellers' capacities at single-stage pressure, while series (pressure) mode routes flow through both impellers in sequence so their pressures combine at single-stage volume.

While supplying attack lines from draft, an operator advances the throttle to raise discharge pressure, but the pressure does not climb and a sound like gravel or marbles is heard inside the pump. This condition is MOST likely:

  1. Normal pressure-governor operation
  2. Cavitation caused by demanding more water than the supply can deliver
  3. Water hammer from a suddenly closed valve
  4. A collapsed tank-to-pump line
WhyCavitation occurs when the pump tries to move more water than the intake can supply; rpm climbs but pressure and flow do not, and collapsing vapor bubbles make a gravel/marble sound. Water hammer is a momentary surge from rapid valve closure, not a throttle-up symptom.

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