Chapter 7 Portable Fire Extinguishers exam with complete solutions.
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Course
CFO - Chief Fire Officer
Institution
CFO - Chief Fire Officer
5. For an extinguishing agent to be approved for use on energized electrical equipment, it must:
A) not conduct electricity.
B) leave no residue.
C) be non-corrosive.
D) be safe for use in a closed room.
2
28. What is the primary extinguishing mechanism of halogenated agents?
A) Suppressing ...
Chapter 7 Portable Fire Extinguishers
exam with complete solutions
1. Which class of fire is depicted in the pictograph system by a fire in a frying pan?
A) K
B) B
C) C
D) D - ANSWER-A) K
2. Which test is required to measure the ability of an extinguisher cylinder to withstand
steady internal pressure?
A) Static
B) Pneumatic
C) Fatigue
D) Hydrostatic - ANSWER-D) Hydrostatic
3. The "P" in the acronym PASS, used in reference to fire extinguisher operation, stands
for:
A) point.
B) pick.
C) pause.
D) pull. - ANSWER-D) pull.
4. What is the term for the substance that puts out the fire?
A) Propellant
B) Extinguishing agent
C) Dry charge
D) Live load - ANSWER-B) Extinguishing agent
5. For an extinguishing agent to be approved for use on energized electrical equipment,
it must:
A) not conduct electricity.
B) leave no residue.
C) be non-corrosive.
, D) be safe for use in a closed room. - ANSWER-A) not conduct electricity.
6. A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.
A) 1.0 gal (3.8 L)
B) 1.5 gal (5.7 L)
C) 2.0 gal (7.6 L)
D) 2.5 gal (9.5 L) - ANSWER-D) 2.5 gal (9.5 L)
7. What does a rating of 40 on a Class B extinguisher mean?
A) BTU absorption comparable to 40 gallons (150 L) of water
B) Sufficient extinguishing power for 40 ft² (4.7 m²) of burning fuel
C) Sufficient extinguishing power for 40 gallons (150 L) of burning fuel
D) Discharge duration of at least 40 seconds - ANSWER-B) Sufficient extinguishing
power for 40 ft² (4.7 m²) of burning fuel
8. A potential problem with application of a multipurpose dry chemical agent to a Class
K fire is:
A) counteraction of other agents applied to the fire.
B) production of toxic gas.
C) spitting and splattering of fuel.
D) sudden flare-up of the fire. - ANSWER-A) counteraction of other agents applied to
the fire.
9. Which extinguishing method is being used when a foam blanket is placed over the
surface of a burning liquid?
A) Cutting off the oxygen supply
B) Inhibiting the chemical chain reaction
C) Diluting the fuel
D) Cooling the fuel - ANSWER-A) Cutting off the oxygen supply
10. Which is a disadvantage of CO2 extinguishers?
A) Electrical conductivity
B) Cost
C) Short discharge range
D) Corrosive residue - ANSWER-C) Short discharge range
11. A Class K agent's effect on the fuel is known as:
A) emulsification.
B) saponification.
C) dissolution.
D) hydrolyzation. - ANSWER-B) saponification.
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