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Driver/Operator Pumper Exam Questions And 100% Correct Answers
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Driver/Operator Pumper Exam Questions And100% Correct Answers
Water - ANSWER - most commonly used extinguishing agent
- noncombustible
- absorbs large amounts of heat
Waters Boiling Point - ANSWER 212° F
Waters freezing point - ANSWER 32°F
Waters Expansion Rate - ANSWER 1,700 to 1 at 500° F
Law of Specific Heat - ANSWER Measures the ability of any substance to absorb heat
Measured in BTUs (British Thermal Units)
1 BTU = the amount of heat required to raise 1lb of water 1°F
Law of Latent Heat of Vaporization - ANSWER Quantity of heat needed to transform a
liquid into a vapor
1 BTU to elevate 1lb of water 1 degree up to 212° F
Adjustable Fog Nozzle - ANSWER Straight Stream
Narrow Fog
,Wide Fog
All 3 discharge at a rate of 100 gpm
The wider the pattern, the shorter the period of time to fill a room with steam.
Advantages of Water - ANSWER 1. Can absorb large volumes of heat
2. As surface area increases, so does heat absorption
3. Water is available in abundant supplies in most areas
4. Steam expands to 1,700 times its volume as water
Disadvantages of Water - ANSWER 1. High surface tension restricts its penetration into
densely packed materials
2. Incompatible with or reactive to some fuels and combustible materials
3. Ice makes roofs and ladders slippery and can make equipment malfunction
4. Conducts electricity and makes work with energized electrical equipment dangerous
Water Pressure - ANSWER The force of water per unit area
PSI - ANSWER pounds per square inch
The elevation of water defines psi
Column of water = 1 in x 1 in x 12 in = 0.434 psi
Height determines psi
6 Characteristics of Water - ANSWER BED PAD
Bottom
Equal
Depth
Perpendicular
All
Density
, Bottom - ANSWER The pressure at the bottom is independent of the shape of the liquid
container above it
Equal - ANSWER The pressure transmitted to a confirmed amount of water is
transmitted equally in all directions
Depth - ANSWER The pressure of water in an open container is proportional to its depth
Perpendicular - ANSWER The pressure on an amount of water is perpendicular to any
surface it acts on
All - ANSWER At any point in the water in a container, pressure is equal in ALL
directions - including upwards
Density - ANSWER The pressure of a liquid in an open container is proportional to the
density of the liquid
Density = the materials weight compared to that of an equal quantity of water
6 Types of Pressure - ANSWER 1. Atmospheric
2. Head
3. Static
4. Flow
5. Residual
6. Normal operating
Atmospheric Pressure - ANSWER The pressure the atmosphere experts on earth
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