Firefighter Mechanical Aptitude · Question
What is the primary function of a positive displacement pump on a fire truck?
Positive displacement pumps deliver a constant rate of flow for a given speed, moving a discrete volume of fluid with each cycle regardless of output pressure (
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Question: What is the primary function of a positive displacement pump on a fire truck?
Answer options:
- To increase the fluid temperature.
- To create a vacuum for suction. ✅ To move a fixed volume of fluid with each revolution or cycle.
- To filter impurities from the fluid.
Correct answer: To move a fixed volume of fluid with each revolution or cycle.
Explanation: Positive displacement pumps deliver a constant rate of flow for a given speed, moving a discrete volume of fluid with each cycle regardless of output pressure (within design limits).
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- Scenario 1: Which simple machine uses a fulcrum to multiply force or change the direction of force?
- Scenario 2: If a hydraulic jack has a small piston with an area of 5 cm² and a large piston with an area of 50
- Scenario 3: Which of the following would require the MOST force to move?
- Scenario 4: A rope is tied to a heavy box. Instead of pulling the box directly, a firefighter wraps the rope a
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