ch 7 test quiz Flashcards
What is an advantage of portable fire extinguishers over hose lines?
faster deployment
What is the most commonly used extinguishing agent for Class A fires?
Water
The traditional symbol for a Class D fire extinguisher is a(n):
yellow star
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
Use on that class of fire could be unsafe
Which is a primary factor when determining hazard classification for extinguisher selection and placement?
Amount of combustibles present
For the purpose of extinguisher selection and placement, a woodworking shop is a(n) __________ hazard environment.
extra
Which is one of the three basic components required for fire?
Oxygen
For an extinguishing agent to be approved for use on energized electrical equipment, it must:
not conduct electricity.
Which is a common dry chemical extinguishing agent?
potassium chloride
What is the term for a water-soluble flammable liquid?
Polar solvent
All portable fire extinguishers use which means for expelling their contents?
Pressure
What residue does a CO2 fire extinguisher leave when discharged?
None
What is the difference between dry powder and dry chemical extinguishing agents?
Each is rated for a different class of fire.
Which extinguishing agent is approved for use in a Class K system?
Wet chemical
A portable fire extinguisher is bested suited for which situation?
Fire in a wastebasket
class of fire image
burning trash can, and burning wood
class A
class of fire image
burning outlet
class C
class of fire image
burning gas can
class B
class of fire image
burning gear
class D
class of fire image
burning pan
class K
If a private residence has a single fire extinguisher, where should it be located?
Kitchen
Which is the most appropriate use for a portable fire extinguisher?
Situations in which the use of water is not recommended
What is an advantage of portable fire extinguishers over hose lines?
Faster deployment
Which class of fire includes cloth?
A
What is the most commonly used extinguishing agent for Class A fires?
Water
Which class of fire involves energized electrical equipment?
C
Which extinguishing agent is suitable for use on a Class C fire?
Carbon dioxide
Which class of fire extinguisher includes a number in its classification?
a
A Class C extinguisher is rated for use on:
energized electrical equipment.
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
Use on that class of fire could be unsafe
Which is a primary factor when determining hazard classification for extinguisher selection and placement?
Amount of combustibles present
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must:
be low combustibility.
For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class?
B
For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?
Classroom
For the purpose of extinguisher selection and placement, a woodworking shop is a(n) __________ hazard environment.
extra
Which is one of the three basic components required for fire?
Oxygen
Combustion begins when a fuel is heated to its:
ignition temperature.
For an extinguishing agent to be approved for use on energized electrical equipment, it must:
not conduct electricity.
Dry chemical extinguishers may be used on Class C fires because they:
do not conduct electricity.
Which is a common dry chemical extinguishing agent?
Potassium chloride
What is the term for a water-soluble flammable liquid?
Polar solvent
Which statement about the numerical rating of a Class K extinguisher is correct?
There is no numerical rating for a Class K extinguisher.
All portable fire extinguishers use which means for expelling their contents?
Pressure
What residue does a CO2 fire extinguisher leave when discharged?
None
In general, the maximum discharge range of a CO2 extinguisher is:
8 ft (2.5 m).
Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure?
Hydrostatic
The production and use of Halon extinguishing agents is limited because they are:
harmful to the earth’s ozone layer.
Bromochlorodifluoromethane is a _________ agent.
halon
What is the difference between dry powder and dry chemical extinguishing agents?
Each is rated for a different class of fire.
A loaded stream extinguisher is designed to:
resist freezing.
Which extinguishing agent is approved for use in a Class K system?
Wet chemical
A portable fire extinguisher is bested suited for which situation?
Fire in a wastebasket
Which is used to pressurize a stored-pressure water extinguisher?
Air
All fire extinguishers are classified according to:
the classes of fire on which they are safe and effective.
A Class C agent must:
not conduct electricity.
Class D agents work primarily by:
forming a crust over the fuel.
What is the best way to extinguish a Class C fire?
Shut off the power and treat it as a Class A or B fire
A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.
2.5 gal (9.5 L)
For an extinguishing agent to be rated for a particular class of fire, it must:
prevent rekindling.
Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
A
According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to:
occupancy type.
For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?
They are not necessarily related
For an area to qualify for the classification of “light hazard,” most of the combustibles present must be:
arranged so that a fire is unlikely to spread.
What is the term for the substance that puts out the fire?
Extinguishing agent
Which hazard category includes automotive service or repair facilities?
Extra
Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
Cutting off the oxygen supply
What is the primary extinguishing mechanism of halogenated agents?
Disrupting the molecular chain reaction
Which statement about dry chemical agents is correct?
Dry chemical agents are not subject to freezing.
How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
By forming a crust over the fuel
Which is a disadvantage of CO2 extinguishers?
Short discharge range
A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception.
Cooking oil
Class B foam fire extinguishers are also effective on:
Class A fires.
Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?
Twisting motion
Which part of a fire extinguisher contains the extinguishing agent?
Cylinder
What expels the extinguishing agent from a pump tank water extinguisher?
Manual effort
Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
After any discharge
A potential problem with application of a multipurpose dry chemical agent to a Class K fire is:
counteraction of other agents applied to the fire. / make fire worse
Which statement is correct regarding Class D extinguishing agents?
The specific agent must be matched to the specific fuel.
When approaching a fire with an extinguisher in hand, you should always have a(n):
exit route.
Which class of fire includes flammable and combustible liquids?
B
A Class K agent’s effect on the fuel is known as:
saponification.
Which class of fire includes combustible metals?
D
Which class of fire includes combustible cooking oils and fats?
K
What does a rating of 40 on a Class B extinguisher mean?
Sufficient extinguishing power for 40 ft² (4.7 m²) of burning fuel
Which class of fire is depicted in the pictograph system by a flame and gasoline can?
B
Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
C
Which class of fire is depicted in the pictograph system by a fire in a frying pan?
K
Requirements for placing and mounting portable fire extinguishers are found in NFPA:
10
Which fire extinguishing agent is best for use on sensitive electronic equipment?
Carbon dioxide
Which compound is added to a water extinguisher to improve penetration of fuel?
A wetting agent
The weight of carbon dioxide is about ___________ times the weight of air.
1.5
The “P” in the acronym PASS, used in reference to fire extinguisher operation, stands for:
pull.
The hydrostatic test interval for a dry chemical extinguisher with a stainless-steel shell is every _____ years.
5
Which agent is rated for use on Class A fires?
Ammonium phosphate
