FIRE FIGHTER 1 - CHAPTER 7
PORTABLE FIRE EXTINGUISHERS
EXAM QUESTIONS WITH RIGHT
ANSWERS \LATEST UPDATE .
A Class C extinguisher is rated for use on: - Correct Answer -energized electrical equipment.
The weight of carbon dioxide is about ___________ times the weight of air. - Correct Answer -1.5
For an area to qualify for the classification of "light hazard," most of the combustibles present must
be: - Correct Answer -arranged so that a fire is unlikely to spread.
Which class of fire is depicted in the pictograph system by a fire in a frying pan? - Correct Answer -K
A Class C agent must: - Correct Answer -not conduct electricity.
What does it mean when a fire extinguisher has a pictograph with a red slash through it? - Correct
Answer -Use on that class of fire could be unsafe
Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
- Correct Answer -C
What is the best way to extinguish a Class C fire? - Correct Answer -Shut off the power and treat it as
a Class A or B fire
A Class B foam extinguisher is effective on all of the following fuels except one. Choose the
exception. - Correct Answer -Cooking oil
Which is a disadvantage of CO2 extinguishers? - Correct Answer -Short discharge range
1
, Which motion best accomplishes the removal of the pin and tamper seal from a portable fire
extinguisher? - Correct Answer -Twisting motion
Which compound is added to a water extinguisher to improve penetration of fuel? - Correct Answer
-A wetting agent
What is the primary extinguishing mechanism of halogenated agents? - Correct Answer -Disrupting
the molecular chain reaction
Which class of fire includes combustible cooking oils and fats? - Correct Answer -K
Which is a primary factor when determining hazard classification for extinguisher selection and
placement? - Correct Answer -Amount of combustibles present
What is the term for the substance that puts out the fire? - Correct Answer -Extinguishing agent
What does a rating of 40 on a Class B extinguisher mean? - Correct Answer -Sufficient extinguishing
power for 40 ft² (4.7 m²) of burning fuel
Dry chemical extinguishers may be used on Class C fires because they: - Correct Answer -do not
conduct electricity.
Which part of a fire extinguisher contains the extinguishing agent? - Correct Answer -Cylinder
The production and use of Halon extinguishing agents is limited because they are: - Correct Answer -
harmful to the earth's ozone layer.
Which statement best summarizes when a dry chemical extinguisher should be serviced and
recharged? - Correct Answer -After any discharge
For the purpose of fire extinguisher placement, what is the relationship between occupancy use
category and hazard classification? - Correct Answer -They are not necessarily related
2
PORTABLE FIRE EXTINGUISHERS
EXAM QUESTIONS WITH RIGHT
ANSWERS \LATEST UPDATE .
A Class C extinguisher is rated for use on: - Correct Answer -energized electrical equipment.
The weight of carbon dioxide is about ___________ times the weight of air. - Correct Answer -1.5
For an area to qualify for the classification of "light hazard," most of the combustibles present must
be: - Correct Answer -arranged so that a fire is unlikely to spread.
Which class of fire is depicted in the pictograph system by a fire in a frying pan? - Correct Answer -K
A Class C agent must: - Correct Answer -not conduct electricity.
What does it mean when a fire extinguisher has a pictograph with a red slash through it? - Correct
Answer -Use on that class of fire could be unsafe
Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
- Correct Answer -C
What is the best way to extinguish a Class C fire? - Correct Answer -Shut off the power and treat it as
a Class A or B fire
A Class B foam extinguisher is effective on all of the following fuels except one. Choose the
exception. - Correct Answer -Cooking oil
Which is a disadvantage of CO2 extinguishers? - Correct Answer -Short discharge range
1
, Which motion best accomplishes the removal of the pin and tamper seal from a portable fire
extinguisher? - Correct Answer -Twisting motion
Which compound is added to a water extinguisher to improve penetration of fuel? - Correct Answer
-A wetting agent
What is the primary extinguishing mechanism of halogenated agents? - Correct Answer -Disrupting
the molecular chain reaction
Which class of fire includes combustible cooking oils and fats? - Correct Answer -K
Which is a primary factor when determining hazard classification for extinguisher selection and
placement? - Correct Answer -Amount of combustibles present
What is the term for the substance that puts out the fire? - Correct Answer -Extinguishing agent
What does a rating of 40 on a Class B extinguisher mean? - Correct Answer -Sufficient extinguishing
power for 40 ft² (4.7 m²) of burning fuel
Dry chemical extinguishers may be used on Class C fires because they: - Correct Answer -do not
conduct electricity.
Which part of a fire extinguisher contains the extinguishing agent? - Correct Answer -Cylinder
The production and use of Halon extinguishing agents is limited because they are: - Correct Answer -
harmful to the earth's ozone layer.
Which statement best summarizes when a dry chemical extinguisher should be serviced and
recharged? - Correct Answer -After any discharge
For the purpose of fire extinguisher placement, what is the relationship between occupancy use
category and hazard classification? - Correct Answer -They are not necessarily related
2
