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Driver- Operator Pumper Questions with Accurate Answers
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Driver- Operator Pumper
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Driver- Operator PumperWater - answer- most commonly used extinguishing agent
- noncombustible
- absorbs large amounts of heat
Waters Boiling Point - answer212° F
Waters freezing point - answer32°F
Waters Expansion Rate - answer1,700 to 1 at 500° F
Law of Specific Heat - answerMeasures 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 - answerThe amount of heat needed to turn a liquid
into a vapor
1 BTU to raise 1lb of water 1 degree up to 212° F
Adjustable Fog Nozzle - answerStraight Stream
Narrow Fog
Wide Fog
All 3 discharge at a rate of 100 gpm
The wider the pattern, the shorter the time span to fill a room with steam.
Advantages of Water - answer1. Can absorb large amounts of heat
2. As surface area increases, heat absorption increases
3. Water is plentiful in most areas
4. Steam occupies 1,700 times its original volume as water
Disadvantages of Water - answer1. High surface tension limits its penetration into
dense materials
2. Incompatible with or reactive to certain 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 - answerThe force of water per unit area
,PSI - answerpounds 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 - answerBED PAD
Bottom
Equal
Depth
Perpendicular
All
Density
Bottom - answerThe pressure at the bottom is independent of the shape of the liquid
container above it
Equal - answerThe pressure transmitted to a confirmed amount of water is transmitted
equally in all directions
Depth - answerThe pressure of water in an open container is proportional to its depth
Perpendicular - answerThe pressure on an amount of water is perpendicular to any
surface it acts on
All - answerAt any point in the water in a container, pressure is equal in ALL directions -
including upwards
Density - answerThe 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 - answer1. Atmospheric
2. Head
3. Static
4. Flow
5. Residual
6. Normal operating
Atmospheric Pressure - answerThe pressure the atmosphere experts on earth
, Sea level = 14.7 psi
Pounds Per Square Inch Gauge - answerPSIG
Shows with atmospheric pressure included in the reading
Pounds Per Square Inch Absolute - answerPSIA
The atmospheric pressure is included, so 14.7 should be subtracted from the overall
reading to obtain the true pressure
Head Pressure - answerBased on the force created by the height of a water supply
above the discharge point
To calculate = divide the head height by 2.3
Static Pressure - answeravailable pressure at a discharge point without water flowing
Residual Pressure - answerwater pressure in a distribution system that is still available
when a hydrant is flowing
Flow Pressure - answerthe forward velocity of water at the discharge point
Measured in a pitot tube and gauge
If diameter of the discharge point is known, the gpm can be calculated
Normal Operating Pressure - answerwater pressure in a distribution system during
regular consumption without any hydrants flowing
Friction Loss - answerThe pressure lost that occurs between the pump and the nozzle
due to hose length and diameter
Reasons for Friction Loss - answer1. Control Valves
2. Hose and Coupling
3. Bends
4. Kinks
5. Adapters
6. Nozzle
7. In Line Gauge
Control Valves - answerWater molecules run against the inside surface of the valves
Hose and Coupling - answerThe smoother the hose lining the less the loss
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