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What is the primary purpose of a fire pump on an apparatus?
A. To transport water
B. To increase water pressure for firefighting operations
C. To cool the engine
D. To store foam concentrate
Answer: B. To increase water pressure for firefighting operations
Rationale: The fire pump's primary function is to increase water pressure from the water
source so it can be delivered effectively through hoselines, master streams, and other
firefighting appliances. Without adequate pressure, water cannot reach the intended
target or overcome friction loss.
Which component prevents debris from entering the fire pump during drafting
operations?
A. Relief valve
B. Intake strainer
C. Priming pump
D. Pressure governor
Answer: B. Intake strainer
Rationale: An intake strainer is attached to the hard suction hose during drafting to
prevent debris, rocks, and other foreign materials from entering and damaging the
pump. This protects internal pump components and ensures reliable operation.
,What does PSI stand for?
A. Pumping System Indicator
B. Pounds per Square Inch
C. Pressure Supply Index
D. Pump Safety Inspection
Answer: B. Pounds per Square Inch
Rationale: PSI is the standard unit of pressure measurement in the fire service. It
indicates the amount of force exerted on one square inch of area and is essential for
calculating discharge pressures and monitoring system performance.
Which type of fire pump is most commonly used on modern fire apparatus?
A. Rotary gear pump
B. Centrifugal pump
C. Piston pump
D. Diaphragm pump
Answer: B. Centrifugal pump
Rationale: Centrifugal pumps are preferred because they provide a smooth, continuous
flow of water, require less maintenance, and are highly efficient under a wide range of
operating conditions.
During drafting, atmospheric pressure can theoretically lift water a maximum of
approximately:
A. 14 feet
B. 24 feet
C. 34 feet
D. 50 feet
Answer: C. 34 feet
, Rationale: Under ideal conditions at sea level, atmospheric pressure can lift water
approximately 34 feet. In actual fireground operations, practical lift is usually limited to
about 20 to 25 feet due to friction loss and equipment limitations.
Cavitation occurs when:
A. Pump pressure is too high
B. Water boils inside the pump due to insufficient intake pressure
C. The engine overheats
D. Air enters the fuel system
Answer: B. Water boils inside the pump due to insufficient intake pressure
Rationale: Cavitation develops when the pressure inside the pump drops below the
vapor pressure of water, causing vapor bubbles to form and collapse violently. This can
severely damage the pump impeller and casing.
What is the standard operating pressure for a smooth bore handline nozzle?
A. 50 psi
B. 75 psi
C. 100 psi
D. 150 psi
Answer: A. 50 psi
Rationale: Smooth bore handline nozzles are designed to operate efficiently at 50 psi
nozzle pressure. This pressure provides optimal stream quality, reach, and flow.
What is the standard operating pressure for a fog nozzle on a handline?
A. 50 psi
B. 75 psi
C. 100 psi