NICET Special Hazards Systems Technician
Level II Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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Question 1:
Which type of fire extinguisher is specifically designed for Class B fires?
A. Water
B. Foam
C. Carbon dioxide
D. Wet chemical
Answer: B. Foam
Rationale: Foam extinguishers are designed to suppress flammable liquid
fires (Class B) by creating a barrier between the fuel and oxygen._
,Question 2:
What is the primary purpose of a pre-action fire suppression system?
A. Detect smoke after water release
B. Immediately release water when heat is detected
C. Prevent accidental discharge of water
D. Suppress fires with foam only
Answer: C. Prevent accidental discharge of water
Rationale: Pre-action systems require a detection event before water
enters the piping, minimizing the risk of accidental flooding._
Question 3:
Which agent is commonly used in total flooding clean agent systems?
A. Water mist
B. Carbon dioxide
C. FM-200 (HFC-227ea)
D. Dry powder
Answer: C. FM-200 (HFC-227ea)
Rationale: FM-200 is a widely used clean agent for total flooding because it
suppresses fire without leaving residue and is safe for occupied spaces._
Question 4:
The time delay in a pre-action system is primarily to:
,A. Increase water pressure
B. Allow verification of a fire event
C. Reduce water flow
D. Activate sprinklers immediately
Answer: B. Allow verification of a fire event
Rationale: Time delays prevent accidental discharge by ensuring the
detection system confirms an actual fire before water is released._
Question 5:
Which type of detector is best for environments with high air velocity?
A. Ionization smoke detector
B. Beam smoke detector
C. Thermal detector
D. Photoelectric detector
Answer: B. Beam smoke detector
Rationale: Beam detectors cover large spaces and are less affected by air
currents than point smoke detectors._
Question 6:
What is the main function of a flow switch in a sprinkler system?
A. Measure water temperature
B. Detect water movement in piping
, C. Activate alarms manually
D. Control pump operation only
Answer: B. Detect water movement in piping
Rationale: Flow switches sense water flow caused by sprinkler activation
and trigger alarms or control circuits._
Question 7:
Which hazard class is a wet chemical system primarily used for?
A. Class A
B. Class B
C. Class K
D. Class D
Answer: C. Class K
Rationale: Wet chemical systems are designed to suppress kitchen fires
involving cooking oils and fats._
Question 8:
In an FM-200 system, what triggers the discharge of the agent?
A. Manual pull station only
B. Sprinkler activation
C. Fire detection system (smoke/heat detectors)
D. Flow switch
Level II Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
Question 1:
Which type of fire extinguisher is specifically designed for Class B fires?
A. Water
B. Foam
C. Carbon dioxide
D. Wet chemical
Answer: B. Foam
Rationale: Foam extinguishers are designed to suppress flammable liquid
fires (Class B) by creating a barrier between the fuel and oxygen._
,Question 2:
What is the primary purpose of a pre-action fire suppression system?
A. Detect smoke after water release
B. Immediately release water when heat is detected
C. Prevent accidental discharge of water
D. Suppress fires with foam only
Answer: C. Prevent accidental discharge of water
Rationale: Pre-action systems require a detection event before water
enters the piping, minimizing the risk of accidental flooding._
Question 3:
Which agent is commonly used in total flooding clean agent systems?
A. Water mist
B. Carbon dioxide
C. FM-200 (HFC-227ea)
D. Dry powder
Answer: C. FM-200 (HFC-227ea)
Rationale: FM-200 is a widely used clean agent for total flooding because it
suppresses fire without leaving residue and is safe for occupied spaces._
Question 4:
The time delay in a pre-action system is primarily to:
,A. Increase water pressure
B. Allow verification of a fire event
C. Reduce water flow
D. Activate sprinklers immediately
Answer: B. Allow verification of a fire event
Rationale: Time delays prevent accidental discharge by ensuring the
detection system confirms an actual fire before water is released._
Question 5:
Which type of detector is best for environments with high air velocity?
A. Ionization smoke detector
B. Beam smoke detector
C. Thermal detector
D. Photoelectric detector
Answer: B. Beam smoke detector
Rationale: Beam detectors cover large spaces and are less affected by air
currents than point smoke detectors._
Question 6:
What is the main function of a flow switch in a sprinkler system?
A. Measure water temperature
B. Detect water movement in piping
, C. Activate alarms manually
D. Control pump operation only
Answer: B. Detect water movement in piping
Rationale: Flow switches sense water flow caused by sprinkler activation
and trigger alarms or control circuits._
Question 7:
Which hazard class is a wet chemical system primarily used for?
A. Class A
B. Class B
C. Class K
D. Class D
Answer: C. Class K
Rationale: Wet chemical systems are designed to suppress kitchen fires
involving cooking oils and fats._
Question 8:
In an FM-200 system, what triggers the discharge of the agent?
A. Manual pull station only
B. Sprinkler activation
C. Fire detection system (smoke/heat detectors)
D. Flow switch
