WorksheetsChapter 9: Portable Fire Extinguishers
Total questions: 38
Worksheet time: 38mins
What are the two primary purposes of portable fire extinguishers?
To extinguish incipient stage fires and to control fires where traditional fire suppression methods are not recommended
To prevent fires from starting and to clean up after fires
To provide water supply and to cool down buildings
To alert the fire department and to evacuate people
Which of the following is NOT one of the five classes of fires classified by the rating system for portable fire extinguishers?
Class A: Ordinary combustibles
Class B: Flammable or combustible liquids or gases
Class E: Explosive materials
Class K: Cooking oils and fats
Fill in the blank: The rating for Class B extinguishers correlates to the ______ of fire an average user could extinguish.
size
color
temperature
duration
Which of the following is a method by which portable fire extinguishers suppress fire?
Cooling the fuel source below its ignition temperature
Increasing the oxygen supply
Adding more fuel
Removing the fire extinguisher
Class A fires involve which of the following?
Flammable liquids such as gasoline
Ordinary combustibles such as wood, cloth, paper, rubber, and plastics
Energized electrical equipment
Cooking oils and fats
Which type of extinguisher is recommended for Class B fires?
Water, wetting agents
Dry chemical, halogenated agents, Class B foam
Carbon dioxide
Special dry powder agents
Class D fires involve which type of material?
Cooking oils and fats
Combustible metals such as magnesium and sodium
Ordinary combustibles
Flammable liquids
Which class of fire extinguisher is rated only with a letter and not a number? Select all that apply.
Class A
Class B
Class C
Class D
Class K
Fill in the blank: A 2-A rating on a Class A extinguisher equals ____ gallons of water firefighting capability.
2.5
1.0
5.0
0.5
Which of the following is a method used to label fire extinguishers?
Colored letters correlating to the class of fire
Pictograms showing the class of fire pictorially
Both A and B
Fire extinguishers are designed with which of the following basic components?
Cylinder, handle, nozzle, and extinguishing agent
Battery, wires, and bulb
Fan, filter, and motor
Screen, keyboard, and processor
According to NFPA 10, what is the maximum height above the floor that the top of a fire extinguisher weighing up to 40 pounds (18 kg) can be mounted?
3.5 feet (1 m)
4 inches (10 cm)
5 feet (2 m)
6 feet (1.8 m)
What does the cylinder of a fire extinguisher hold?
The extinguishing agent.
Compressed air only.
Water only.
Electrical wires.
Which part of a fire extinguisher is used to carry and hold the extinguisher?
Carrying handle.
Nozzle.
Pressure gauge.
Safety pin.
What does the trigger on a fire extinguisher do?
It is pressed to release the agent by opening the discharge valve.
It is used to refill the extinguisher with agent.
It is used to check the pressure of the extinguisher.
It is used to lock the safety pin in place.
What is the purpose of the locking mechanism on a fire extinguisher?
It prevents accidental discharge.
It increases the pressure inside the extinguisher.
It helps to identify the type of fire extinguisher.
It makes the extinguisher lighter to carry.
What does the pressure indicator on a fire extinguisher show?
It shows if the extinguisher is adequately pressurized and ready for use.
It shows the type of fire the extinguisher can put out.
It shows the amount of chemical left in the extinguisher.
It shows the last inspection date of the extinguisher.
Which agent in fire extinguishers separates the fuel from oxygen?
Class B foam.
Water mist.
Carbon dioxide.
Dry powder.
Which agent in fire extinguishers interrupts chemical reaction?
Dry chemicals.
Water.
Carbon dioxide.
Foam.
Which agent in fire extinguishers creates a soapy foam?
Wet chemicals.
Carbon dioxide.
Dry powder.
Halon.
Which agent in fire extinguishers displaces oxygen?
CO₂.
Water
Sand
Foam
Which operating system stores the agent and expellant together in a fire extinguisher?
Stored pressure.
Cartridge operated.
Water mist.
Clean agent.
What does the acronym PASS stand for in operating a portable fire extinguisher?
Pull pin, Aim at the base of the fire, Squeeze the lever slowly, Sweep side to side.
Push lever, Alert authorities, Spray water, Stand back.
Press pin, Aim high, Squeeze hard, Spin around.
Pull lever, Aim at the top, Squeeze gently, Sweep upward.
What does the care and maintenance of fire extinguishers involve?
Inspecting
Maintaining
Recharging
All of the above
Hydrostatic testing of fire extinguishers is required to verify the ______ and strength of the cylinder and valve components.
integrity
color
weight
temperature
What is the term for the following definition? A concentrate that when combined with water reduces the surface tension of the water and creates a foam. Also called wet water.
Class A foam concentrate
Dry chemical powder
Halotron agent
Carbon dioxide extinguisher
What is the term for the following definition? Electrically nonconducting, volatile, or gaseous fire extinguishant that does not leave a residue upon evaporation. (NFPA 10)
clean agent
dry chemical
foam
water mist
What is the term for the following definition? Solid materials in powder or granular form designed to extinguish Class D combustible metal fires by crusting, smothering, or heat-transferring means. (NFPA 10)
dry powder
foam
carbon dioxide
wet chemical
Fill in the blank: The grip used for holding and carrying a portable fire extinguisher is called the _________.
handle
nozzle
lever
pin
Fill in the blank: Pressure testing of a fire extinguisher to verify its strength against unwanted rupture is called _________.
hydrostatic testing
visual inspection
leakage test
functional check
Fill in the blank: An occupancy where the quantity, combustibility, and heat release of the materials is low, and the majority of materials are arranged so that a fire is not likely to spread is called a _________?
light hazard area
ordinary hazard area
high hazard area
special hazard area
A device for use in applications requiring special water discharge patterns, directional spray, or other unusual discharge characteristics. (NFPA 13) What is this device called?
nozzle
sprinkler head
hydrant
valve
A dry chemical fire extinguisher rated for only Class B and Class C fires is called what?
ordinary dry-chemical fire extinguisher
water fire extinguisher
carbon dioxide fire extinguisher
wet chemical fire extinguisher
What is the acronym for the steps involved in operating a portable fire extinguisher?
PASS
SAFE
FIRE
STOP
A document developed by gathering general and detailed data that is used by responding personnel in effectively managing emergencies for the protection of occupants, responding personnel, property, and the environment. (NFPA 1660) What is this document called?
preincident plan
incident action report
emergency evacuation map
hazardous materials manifest
The process of converting the fatty acids in cooking oils or fats to soap or foam; the action caused by a Class K fire extinguisher is called what?
saponification
emulsification
oxidation
fermentation
A retaining device that breaks when the locking mechanism is released. Fill in the blank: The term described above is _______.
tamper seal
padlock
hinge pin
spring clip
The button or lever used to discharge the agent from a portable fire extinguisher. The term described is:
trigger
nozzle
cylinder
hose
