Fire Apparatus Driver/Operator Exam Questions with Correct Answers 100% Verified By
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Aqueous dissolved in water
Dry-Barrel Hydrant Fire hydrant that has its operating valve located at the base or foot of
the hydrant rather than in the barrel of the hydrant. When operating properly, there is no
water in the barrel of the hydrant when it is not in use. These hydrants are used in areas where
freezing may occur.
Elevation pressure The amount of pressure created by gravity
Flow pressure Forward pressure at a discharge opening while water is flowing.
Hardness Mineral content of water, usually consisting of calcium and magnesium.
heat of vaporization The amount of energy required for the liquid at its boiling point to
become a gas
kinetic energy the energy an object has due to its motion
Normal operating pressure The observed static pressure in a water distribution system
during a period of normal demand.
Pitot gauge A type of gauge that is used to measure the velocity pressure of water that is
being discharged from an opening. It is used to determine the flow of water from a hydrant.
potential energy stored energy that results from the position or shape of an object
,Residual pressure The pressure that exists in the distribution system, measured at the
residual hydrant at the time the flow readings are taken at the flow hydrants.
specific heat index The amount of heat energy required to raise the temperature of a
substance. These values are determined experimentally and then made available in tabular
form.
surface tension Elastic like force at the surface of a liquid, which tends to minimize the
surface area, causing water droplets to form
Turbidity Amount of suspended particles in water
How often should dry hydrants be flow-tested? Annually
Class C fire hydrant color and flow Red; less than 500 gpm
A Class B hydrant has a flow rate of ___________ gallons per minute. Color? 500 to 999
gpm; orange
CLASS A HYDRANT COLOR AND GPM Green, 1000-1499 GPM
Class AA Hydrant 1 500 gpm (5 680 L/min) or greater. Light blue top and nozzles.
Which way should the fire hydrant connections, especially the large steamer connection, be
facing? Towards the street
How much clearance does NFPA 291 require the center of a hose outlet on a fire hydrant be
from the finish grade surface? A minimum of 8 inches
,How can you tell if a dry-barrel hydrant is fully drained before replacing caps? Placing a hand
over the outlet, if you feel suction, the hydrant has not finished draining
How far are fire hydrants placed apart? About 500 ft in residential areas and about 300 ft in
high value commercial or industrial areas
True or false; you should always fully open and fully close a dry barrel hydrant. True; A
partially opened valve on a dry barrel hydrant means the drain is also partially open, causing
the water to flow out. This can cause erosion of the soil and damage the base of the hydrant.
For the driver/operator, elevation refers to the position of the pump (above or below) as it
relates to the nozzle. Pressure will __________ when the nozzle is below the pump and
__________ when the nozzle is above the pump. Increase; decrease
How much does atmospheric pressure decrease (in psi) per 1000 ft the location rises above sea
level? 0.5 psi
In the fire service, what is the minimum usable residual pressure without risking damage to
underground pumps or water mains? 20 psi
What are the six principals of fluid pressure? 1: fluid pressure is exerted perpendicular to
any surface on which it acts
2: pressure in a fluid acts equally in all directions
3: pressure applied to a confined liquid from without is transmitted equally in all directions
4: pressure of a liquid in an open vessel is proportional to the depth of the liquid; pressure
increases and depth increases
5: the pressure of the liquid in an open container is proportional to the density of the liquid
6: liquid pressure at the bottom of a container is unaffected by the size and the shape of the
container; only the distance between the top and bottom matter
, If two or more hydrants on the same dead-end main are used to fight fire, the ________
hydrant will have more water and water pressure. Upstream
In general, what pressure does the water distribution system operate at the delivery point?
20-80 psi
True or false; H2O has a generally low ability to conduct electricity. True, the ability to
conduct electricity actually depends of the amount of dissolved solids in the water (turbidity)
What happens when two dissimilar metals are submersed in water Galvanic corrosion
Water at 32 degrees Fahrenheit is almost ________________ pounds per cubic foot heavier
than water at 100 degrees Fahrenheit. One half
What are the three primary reasons water is used to extinguish fires? 1. Water turns to
steam which is a volume of 1700 times greater than that of equal liquid water which displaces
oxygen and smothers the fire
2. Water absorbs heat and cools the air, smoke, room and contents, thus reducing ignition
temp and removing fuel source
3. Water molecules in steam carry elements of smoke with while being ventilated
Waters specific heat index is _____ 1
NFPA 1002 Standard for Fire Apparatus Driver/Operator Professional Qualifications
vehicle intercom system provides a headset and microphone for each rider on the fire
apparatus. enable the fire fighters on the apparatus to communicate clearly.
Experts| Latest Update Guaranteed Success
Aqueous dissolved in water
Dry-Barrel Hydrant Fire hydrant that has its operating valve located at the base or foot of
the hydrant rather than in the barrel of the hydrant. When operating properly, there is no
water in the barrel of the hydrant when it is not in use. These hydrants are used in areas where
freezing may occur.
Elevation pressure The amount of pressure created by gravity
Flow pressure Forward pressure at a discharge opening while water is flowing.
Hardness Mineral content of water, usually consisting of calcium and magnesium.
heat of vaporization The amount of energy required for the liquid at its boiling point to
become a gas
kinetic energy the energy an object has due to its motion
Normal operating pressure The observed static pressure in a water distribution system
during a period of normal demand.
Pitot gauge A type of gauge that is used to measure the velocity pressure of water that is
being discharged from an opening. It is used to determine the flow of water from a hydrant.
potential energy stored energy that results from the position or shape of an object
,Residual pressure The pressure that exists in the distribution system, measured at the
residual hydrant at the time the flow readings are taken at the flow hydrants.
specific heat index The amount of heat energy required to raise the temperature of a
substance. These values are determined experimentally and then made available in tabular
form.
surface tension Elastic like force at the surface of a liquid, which tends to minimize the
surface area, causing water droplets to form
Turbidity Amount of suspended particles in water
How often should dry hydrants be flow-tested? Annually
Class C fire hydrant color and flow Red; less than 500 gpm
A Class B hydrant has a flow rate of ___________ gallons per minute. Color? 500 to 999
gpm; orange
CLASS A HYDRANT COLOR AND GPM Green, 1000-1499 GPM
Class AA Hydrant 1 500 gpm (5 680 L/min) or greater. Light blue top and nozzles.
Which way should the fire hydrant connections, especially the large steamer connection, be
facing? Towards the street
How much clearance does NFPA 291 require the center of a hose outlet on a fire hydrant be
from the finish grade surface? A minimum of 8 inches
,How can you tell if a dry-barrel hydrant is fully drained before replacing caps? Placing a hand
over the outlet, if you feel suction, the hydrant has not finished draining
How far are fire hydrants placed apart? About 500 ft in residential areas and about 300 ft in
high value commercial or industrial areas
True or false; you should always fully open and fully close a dry barrel hydrant. True; A
partially opened valve on a dry barrel hydrant means the drain is also partially open, causing
the water to flow out. This can cause erosion of the soil and damage the base of the hydrant.
For the driver/operator, elevation refers to the position of the pump (above or below) as it
relates to the nozzle. Pressure will __________ when the nozzle is below the pump and
__________ when the nozzle is above the pump. Increase; decrease
How much does atmospheric pressure decrease (in psi) per 1000 ft the location rises above sea
level? 0.5 psi
In the fire service, what is the minimum usable residual pressure without risking damage to
underground pumps or water mains? 20 psi
What are the six principals of fluid pressure? 1: fluid pressure is exerted perpendicular to
any surface on which it acts
2: pressure in a fluid acts equally in all directions
3: pressure applied to a confined liquid from without is transmitted equally in all directions
4: pressure of a liquid in an open vessel is proportional to the depth of the liquid; pressure
increases and depth increases
5: the pressure of the liquid in an open container is proportional to the density of the liquid
6: liquid pressure at the bottom of a container is unaffected by the size and the shape of the
container; only the distance between the top and bottom matter
, If two or more hydrants on the same dead-end main are used to fight fire, the ________
hydrant will have more water and water pressure. Upstream
In general, what pressure does the water distribution system operate at the delivery point?
20-80 psi
True or false; H2O has a generally low ability to conduct electricity. True, the ability to
conduct electricity actually depends of the amount of dissolved solids in the water (turbidity)
What happens when two dissimilar metals are submersed in water Galvanic corrosion
Water at 32 degrees Fahrenheit is almost ________________ pounds per cubic foot heavier
than water at 100 degrees Fahrenheit. One half
What are the three primary reasons water is used to extinguish fires? 1. Water turns to
steam which is a volume of 1700 times greater than that of equal liquid water which displaces
oxygen and smothers the fire
2. Water absorbs heat and cools the air, smoke, room and contents, thus reducing ignition
temp and removing fuel source
3. Water molecules in steam carry elements of smoke with while being ventilated
Waters specific heat index is _____ 1
NFPA 1002 Standard for Fire Apparatus Driver/Operator Professional Qualifications
vehicle intercom system provides a headset and microphone for each rider on the fire
apparatus. enable the fire fighters on the apparatus to communicate clearly.
