CO Fire Suppression Systems
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A |
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1. Which of the following is the primary purpose of a fire suppression
system?
A) To alert occupants of a fire
B) To extinguish or control fires
C) To provide emergency lighting
D) To detect smoke only
B) To extinguish or control fires
Rationale: The main goal of fire suppression systems is to control or
extinguish fires to prevent property damage and save lives.
2. What type of agent is typically used in a wet-pipe sprinkler system?
A) Carbon dioxide
B) Water
C) Foam
D) Dry chemical
B) Water
Rationale: Wet-pipe sprinkler systems are filled with water at all
times, making water the primary extinguishing agent.
3. In a dry-pipe sprinkler system, what prevents water from filling the
pipes until the system is activated?
A) Pressure gauge
B) Alarm valve
C) Air pressure
D) Fusible link
C) Air pressure
, Rationale: Dry-pipe systems are filled with pressurized air or
nitrogen, which holds back water until a sprinkler head opens.
4. Which component in a sprinkler head melts to release water during a
fire?
A) Deflector
B) Fusible link
C) Pendent arm
D) Valve
B) Fusible link
Rationale: Fusible links are designed to melt at a specific
temperature, allowing water to flow through the sprinkler head.
5. What is the minimum water pressure required for a typical residential
sprinkler system?
A) 10 psi
B) 15 psi
C) 7 psi
D) 50 psi
B) 15 psi
Rationale: Most residential sprinkler systems require a minimum of
15 psi to ensure adequate water flow for fire suppression.
6. Which class of fire involves ordinary combustibles such as wood and
paper?
A) Class A
B) Class B
C) Class C
D) Class D
A) Class A
Rationale: Class A fires involve materials like wood, paper, and cloth,
which can be extinguished with water or foam.
7. Carbon dioxide fire suppression systems are primarily used for which
type of hazard?
A) Class A fires
B) Class B fires
C) Class C fires
D) Class D fires
C) Class C fires
, Rationale: CO2 systems are electrically non-conductive, making them
suitable for fires involving electrical equipment (Class C).
8. Which NFPA standard governs the installation of sprinkler systems?
A) NFPA 13
B) NFPA 72
C) NFPA 25
D) NFPA 70
A) NFPA 13
Rationale: NFPA 13 provides the standards for the design and
installation of automatic sprinkler systems.
9. What is the function of a fire department connection (FDC) on a
sprinkler system?
A) To drain the system
B) To allow firefighters to supplement water supply
C) To test the system alarm
D) To release water pressure
B) To allow firefighters to supplement water supply
Rationale: The FDC allows firefighters to pump water into the
sprinkler system to boost pressure during a fire.
10. In a foam suppression system, which type of foam is most
suitable for hydrocarbon fires?
A) Aqueous film-forming foam (AFFF)
B) Alcohol-resistant foam
C) High-expansion foam
D) Protein foam
A) Aqueous film-forming foam (AFFF)
Rationale: AFFF is effective on flammable liquid fires
(hydrocarbons) by creating a film that suppresses vapor release.
11. Which type of valve is used to control the water supply in a wet-
pipe sprinkler system?
A) Gate valve
B) Alarm valve
C) Check valve
D) Butterfly valve
B) Alarm valve
Rationale: The alarm valve controls water flow into the system and
activates alarms when a sprinkler operates.
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which of the following is the primary purpose of a fire suppression
system?
A) To alert occupants of a fire
B) To extinguish or control fires
C) To provide emergency lighting
D) To detect smoke only
B) To extinguish or control fires
Rationale: The main goal of fire suppression systems is to control or
extinguish fires to prevent property damage and save lives.
2. What type of agent is typically used in a wet-pipe sprinkler system?
A) Carbon dioxide
B) Water
C) Foam
D) Dry chemical
B) Water
Rationale: Wet-pipe sprinkler systems are filled with water at all
times, making water the primary extinguishing agent.
3. In a dry-pipe sprinkler system, what prevents water from filling the
pipes until the system is activated?
A) Pressure gauge
B) Alarm valve
C) Air pressure
D) Fusible link
C) Air pressure
, Rationale: Dry-pipe systems are filled with pressurized air or
nitrogen, which holds back water until a sprinkler head opens.
4. Which component in a sprinkler head melts to release water during a
fire?
A) Deflector
B) Fusible link
C) Pendent arm
D) Valve
B) Fusible link
Rationale: Fusible links are designed to melt at a specific
temperature, allowing water to flow through the sprinkler head.
5. What is the minimum water pressure required for a typical residential
sprinkler system?
A) 10 psi
B) 15 psi
C) 7 psi
D) 50 psi
B) 15 psi
Rationale: Most residential sprinkler systems require a minimum of
15 psi to ensure adequate water flow for fire suppression.
6. Which class of fire involves ordinary combustibles such as wood and
paper?
A) Class A
B) Class B
C) Class C
D) Class D
A) Class A
Rationale: Class A fires involve materials like wood, paper, and cloth,
which can be extinguished with water or foam.
7. Carbon dioxide fire suppression systems are primarily used for which
type of hazard?
A) Class A fires
B) Class B fires
C) Class C fires
D) Class D fires
C) Class C fires
, Rationale: CO2 systems are electrically non-conductive, making them
suitable for fires involving electrical equipment (Class C).
8. Which NFPA standard governs the installation of sprinkler systems?
A) NFPA 13
B) NFPA 72
C) NFPA 25
D) NFPA 70
A) NFPA 13
Rationale: NFPA 13 provides the standards for the design and
installation of automatic sprinkler systems.
9. What is the function of a fire department connection (FDC) on a
sprinkler system?
A) To drain the system
B) To allow firefighters to supplement water supply
C) To test the system alarm
D) To release water pressure
B) To allow firefighters to supplement water supply
Rationale: The FDC allows firefighters to pump water into the
sprinkler system to boost pressure during a fire.
10. In a foam suppression system, which type of foam is most
suitable for hydrocarbon fires?
A) Aqueous film-forming foam (AFFF)
B) Alcohol-resistant foam
C) High-expansion foam
D) Protein foam
A) Aqueous film-forming foam (AFFF)
Rationale: AFFF is effective on flammable liquid fires
(hydrocarbons) by creating a film that suppresses vapor release.
11. Which type of valve is used to control the water supply in a wet-
pipe sprinkler system?
A) Gate valve
B) Alarm valve
C) Check valve
D) Butterfly valve
B) Alarm valve
Rationale: The alarm valve controls water flow into the system and
activates alarms when a sprinkler operates.
