Fire Apparatus Driver-Operator - Pumper Module 4 Questions and Answers Fully Solved
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FIRE APPARATUS DRIVER/OPERATOR - PUMPER
Fire Apparatus Driver-Operator - Pumper Module 4 Questions and Answers Fully Solved
One gallon of water weighs?
8.33 lbs
Water freeze and boil temperatures?
Freezes: 32° F
Boils: 212° F
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law of specific heat ability of any substance to a
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Fire Apparatus Driver-Operator - Pumper
Module 4 Questions and Answers Fully
Solved
One gallon of water weighs? - answer8.33 lbs
Water freeze and boil temperatures? - answerFreezes: 32° F
Boils: 212° F
Water expansion ratio at 500° F. - answer1,700 to 1
Law of Specific Heat - answerAbility of any substance to absorb heat. Water is the
standard for measuring specific heat and is given a value of 1.0
Specific heat is measured in British Thermal Unites (BTUs).
Latent Heat of Vaporization - answerThe amount of heat needed to turn a liquid into a
vapor.
It takes one BTU to raise one pound of water 1°, up to 212° F. Once water reaches 212°
F, each pound requires an additional 970 BTUs to convert it to steam.
Knowledge Check 1
1. Most extinguishing agents require less than one BTU to raise their temperature 1° F.
2. This is the heat absorbing capacity of a substance.
3. Water absorbs over 950 additional BTUs going from 212° F to steam.
4. This is the amount of heat needed to turn a liquid into a vapor. - answerLaw of
specific Heat
1&2
Law of Latent Heat of Vaporization
3&4
Heat Absorption - answerSpeed at which water absorbs heat depends upon the amount
of water surface exposed to the heat.
,Example
Fog nozzle flowing at 100 gpm for a room 96x50x10 will fill a room with steam using the
different patterns. - answerStraight Stream: 9 Minutes
Narrow Fog: 6 Minutes
Wide Fog: 1.5 Minutes
Advantages of water as an extinguishing agent - answerCan absorb large amount of
heat before turning to steam
As surface area increases, heat absorption speeds up
Steam occupies 1,700 times its original volume as water
Water is plentiful in most areas.
Disadvantages of water as an extinguish agent - answerHigh surface tension limits its
penetration into dense materials
Incompatible with or reactive to certain fuels and combustible metals
Ice makes roofs and ladders slippery an can make equipment malfunction
Conducts electricity and makes work with energized electrical equipment dangerous.
Knowledge Check 2
1. Water can absorb large amount of heat before turning to steam
2. Water is reactive to certain combustible metals
3. As water's surface area increases, its heat absorption increases
4. Water has a high surface tension - answerAdvantage
1&3
Disadvantage
2&4
Water Pressure - answerColumn of water
one inch (W) x one inch (L) x 12 inches (H) = 0.434 psi
12 inches (W) x 12 inches (L) x 12 inches (H) = 0.434 psi
,one inch (W) x one inch (L) x 24 inches (H) = 0.868 psi
Characteristics of Water Pressure - answerB = Bottom
E = Equal
D = Depth
P = Perpendicular
A = All
D = Density
Characteristics of Water Pressure Definitions - answerBottom = Pressure at the bottom
of a container
Equal = Pressure transmitted to a confined amount of water is transmitted equally in all
directions.
Depth = Pressure of water in an open container is proportional to its depth
Perpendicular = Pressure on an amount of water is perpendicular to any surface it acts
on
All = At any point in the water in a container, pressure is equal in all directions, including
upwards.
Density = Pressure of a liquid in an open container is proportional to the density of the
liquid. The density of a liquid refers to the material's weight compared to that of an equal
quantity of water. Water is given the weight of "one"; other materials are either lighter
(<1) or heavier than water (>1).
Knowledge Check 3
You're presented with a column of water three feet by three feet, with a height of one
foot. The water pressure of this column equals: - answerA. 0.145 psi
B. 0.434 psi (Correct Answer)
C. 0.868 psi
D. 1.302 psi
Knowledge Check 4
, Identify Two characteristics of water pressure - answerA. The pressure on water is
parallel to any surface it acts on.
B. The water in two containers with the same height but different bottoms dimensions
will have the same pressure at the bottom no matter what the shape of the container.
(Correct Answer)
C. Pressure, when transmitted to a confined amount of water, is greatest in the direction
of gravity.
D. In two containers with the same bottom dimensions and both containing water, but
with unequal heights, the pressure of the water at the bottom of each container is still
equal.
E. The pressure of a liquid in an open container is proportional to the density of the
liquid. (Correct Answer)
Type of Pressure Definitions - answerHead Pressures = Forced created by the height of
a water supply above the discharge point. (calculate by dividing height by 2.3)
Static Pressure = Pressure at discharge point without water flowing
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