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FDNY S18 Dry Chemical Fire Extinguishing Systems Inspection, Testing and Servicing Techn, Exams of Safety and Fire Engineering

Chamberlain College of NursingSafety and Fire Engineering

FDNY S18 Dry Chemical Fire Extinguishing Systems Inspection, Testing and Servicing Technician (Citywide) Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Typology: Exams

2025/2026

Available from 01/12/2026

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FDNY S18 Dry Chemical Fire Extinguishing
Systems Inspection, Testing and Servicing
Technician (Citywide) Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which type of fire is a dry chemical extinguisher most effective
against?
a) Class A only
b) Class B only
c) Class C only
d) Class B and C
Dry chemical extinguishers are designed to interrupt chemical
reactions in flammable liquids (Class B) and electrical fires (Class
C).
2. NFPA standards require dry chemical systems to be inspected how
often?
a) Monthly
b) Annually
c) Every 5 years
d) Every 10 years
Annual inspections are required to ensure system readiness and
compliance with NFPA 17 standards.
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Download FDNY S18 Dry Chemical Fire Extinguishing Systems Inspection, Testing and Servicing Techn and more Exams Safety and Fire Engineering in PDF only on Docsity!

FDNY S18 Dry Chemical Fire Extinguishing

Systems Inspection, Testing and Servicing

Technician (Citywide) Exam Questions And

Correct Answers (Verified Answers) Plus

Rationales 2026 Q&A | Instant Download Pdf

  1. Which type of fire is a dry chemical extinguisher most effective against? a) Class A only b) Class B only c) Class C only d) Class B and C Dry chemical extinguishers are designed to interrupt chemical reactions in flammable liquids (Class B) and electrical fires (Class C).
  2. NFPA standards require dry chemical systems to be inspected how often? a) Monthly b) Annually c) Every 5 years d) Every 10 years Annual inspections are required to ensure system readiness and compliance with NFPA 17 standards.
  1. What is the primary purpose of a hydrostatic test on a dry chemical cylinder? a) Clean the cylinder b) Refill the cylinder c) Verify structural integrity d) Adjust the nozzle Hydrostatic testing confirms that the cylinder can safely hold pressure without leaks or deformation.
  2. Which of the following components should be checked during a dry chemical system inspection? a) Only the agent b) Cylinders, valves, hoses, and nozzles c) Only the nozzles d) Only the control panel A complete inspection ensures all system components are functional and meet safety standards.
  3. A dry chemical cylinder that has been discharged should be: a) Reused immediately b) Refilled and inspected c) Left empty until the next inspection d) Painted to mark as discharged Discharged cylinders must be refilled and inspected before returning to service.
  4. Which type of dry chemical is commonly used in commercial fire suppression systems? a) Sodium bicarbonate b) Water-based powder

Documentation review ensures proper identification of system type, age, and maintenance history.

  1. When inspecting a dry chemical system, which of the following indicates potential corrosion? a) Normal paint wear b) Rust, pitting, or discoloration c) Slight dust accumulation d) Fingerprints on the cylinder Corrosion can compromise cylinder integrity and must be addressed immediately.
  2. What safety precaution should be taken when handling dry chemical cylinders? a) Wear casual clothing b) Use gloves and eye protection c) Only use a cloth to hold the cylinder d) No precautions are needed Dry chemical powders can irritate skin and eyes, and cylinders are pressurized.
  3. Which NFPA standard governs the installation and maintenance of dry chemical extinguishing systems? a) NFPA 10 b) NFPA 17 c) NFPA 13 d) NFPA 72 NFPA 17 specifically covers dry chemical extinguishing systems.
  4. What does a yellow tag on a dry chemical cylinder usually indicate?

a) Fully charged b) Needs service or inspection c) Recently inspected d) Not to be used Tag colors are used to indicate service status; yellow often signals inspection is due.

  1. What type of test confirms that a system’s nozzles discharge correctly? a) Hydrostatic test b) Visual inspection c) Flow test or discharge test d) Pressure gauge check Discharge tests ensure the system releases the agent effectively and covers the protected area.
  2. How should a leaking dry chemical cylinder be handled? a) Attempt to patch it b) Remove from service and mark as defective c) Shake to redistribute pressure d) Use it in an emergency only A leaking cylinder is unsafe and must be replaced or serviced immediately.
  3. During a dry chemical system inspection, which is a common sign of mechanical damage? a) Faded labels b) Slight dust c) Dents or cracks in the cylinder or valve d) Minor paint scratches
  1. What is the typical life expectancy of a dry chemical cylinder before replacement? a) 5 years b) 10 years c) 12–20 years depending on inspection and condition d) 30 years Proper maintenance and inspection extend cylinder life, but NFPA sets maximum service periods.
  2. A dry chemical cylinder pressure gauge in the red zone indicates: a) Fully charged b) Undercharged or unsafe c) Overcharged d) Normal condition Pressure in the red zone signals the cylinder may not function properly.
  3. Which type of dry chemical system is often installed in commercial kitchens? a) Water mist b) Foam c) Wet chemical and dry chemical combo systems d) CO₂ only Dry chemical is effective on grease and flammable liquid fires, sometimes combined with wet chemical systems.
  4. What is the primary hazard of inhaling dry chemical agent? a) Allergic reaction b) Respiratory irritation

c) Electrical shock d) Burns Dry chemical powders can irritate lungs and mucous membranes.

  1. What is required after replacing a cylinder in a dry chemical system? a) Only update records b) Nothing c) Conduct inspection and function test d) Paint the cylinder Verification ensures the new cylinder operates correctly within the system.
  2. Which type of record must be maintained for dry chemical system inspections? a) Only purchase receipts b) Inspection, testing, and service records c) Employee attendance d) Cleaning logs NFPA requires documentation to demonstrate compliance and system readiness.
  3. When performing a hydrostatic test, what is being measured? a) Agent color b) Valve function c) Cylinder’s ability to hold pressure without deformation d) Nozzle spray pattern Hydrostatic tests verify structural integrity under pressure.

d) Do not label Service tags provide traceable maintenance records.

  1. During inspection, what is the purpose of checking mounting brackets? a) Aesthetic reasons b) Prevent theft c) Ensure cylinders remain securely in place d) Check agent quantity Loose or damaged brackets could cause cylinders to fall or become damaged.
  2. What is the most common cause of dry chemical agent caking? a) High humidity b) Low temperature c) Moisture contamination d) Overcharging the cylinder Moisture causes the dry chemical to clump, reducing discharge effectiveness.
  3. Which personal protective equipment is essential when servicing dry chemical systems? a) Hard hat only b) Gloves, eye protection, and respirator if needed c) Ear plugs d) None Protection prevents injury from powder, high-pressure cylinders, and accidental discharge.
  1. What is the significance of the NFPA 17 color code for cylinders? a) Cylinder age b) Agent type c) Installation location d) Inspection date Color coding helps quickly identify the type of extinguishing agent in the cylinder.
  2. Which tool is commonly used to check cylinder threads during maintenance? a) Hammer b) Thread gauge c) Wrench only d) Screwdriver Thread gauges ensure secure fitting of valves and hoses without leaks.
  3. How should a dry chemical system be activated for a functional test? a) Without protective equipment b) Indoors near combustible materials c) In a controlled environment following NFPA guidelines d) Only after painting the cylinder Controlled activation prevents injury and property damage while confirming system operation.
  4. Which inspection is required monthly for dry chemical extinguishers in a facility? a) Hydrostatic
  1. How often should pressure gauges on dry chemical cylinders be calibrated? a) Never b) Every 10 years c) Annually d) Every 20 years Annual calibration ensures accurate pressure readings for safe operation.
  2. Which factor can reduce the effectiveness of a dry chemical agent? a) Proper storage b) Correct agent type c) Moisture contamination or caking d) Monthly inspections Moisture or caking can prevent proper discharge during a fire emergency.
  3. What should be verified after servicing the system? a) Cylinder color b) Label legibility c) System pressure, agent quantity, and proper operation d) Location of fire exits Verification ensures the system is fully operational and code- compliant.
  4. Which type of fire is NOT effectively controlled by dry chemical systems? a) Class B b) Class C

c) Deep-seated Class A fires without surface fuel d) Flammable liquid fires Deep-seated Class A fires may require water-based systems for effective suppression.

  1. Which NFPA publication provides guidance for inspection, testing, and maintenance of extinguishing systems? a) NFPA 70 b) NFPA 17 and NFPA 25 c) NFPA 10 only d) NFPA 13 only NFPA 17 covers dry chemical systems, and NFPA 25 covers maintenance of water-based suppression systems.
  2. What is the proper action if a dry chemical system is discharged accidentally during service? a) Ignore it b) Shake the cylinder c) Follow emergency procedures, notify authorities, and clean the area d) Replace the cylinder immediately without reporting Proper reporting ensures safety and compliance with regulatory requirements.
  3. Which environmental condition is most damaging to dry chemical cylinders? a) Low light b) Cold temperature c) High humidity and moisture exposure d) Indoor air circulation
  1. Which of the following is an indication that a cylinder has been over-pressurized? a) Normal gauge reading b) Light surface rust c) Bulging or deformation of the cylinder body d) Faded labels Over-pressurization can cause permanent cylinder deformation, making it unsafe.
  2. What is the primary function of the discharge hose in a dry chemical system? a) Store the chemical agent b) Direct the agent to the fire area c) Measure pressure d) Prevent accidental discharge Hoses ensure the agent reaches the fire safely and effectively.
  3. During an inspection, a technician notices a cracked nozzle. The correct action is to: a) Paint over it b) Replace the nozzle immediately c) Ignore it d) Continue service A cracked nozzle can disrupt the discharge pattern and reduce effectiveness.
  4. Which type of fire is a purple K-class dry chemical agent designed for? a) Class A b) Class B

c) Commercial kitchen grease fires (Class K) d) Electrical fires (Class C) Purple K agents are specifically formulated for high-temperature cooking oil fires.

  1. What is the significance of the cylinder hydrostatic test date stamped on the body? a) Manufacturing date b) Last refill date c) Date when the cylinder passed a hydrostatic pressure test d) Expiration date of the chemical The stamp indicates the cylinder was tested and approved for safe pressurization.
  2. When replacing a cylinder in a dry chemical system, what must be verified first? a) Cylinder color b) Gauge position c) Correct agent type and size per system specifications d) Wall mounting location Incorrect agent or cylinder size can result in system failure during a fire.
  3. Which inspection checks for leaks in valves or hoses without discharging the agent? a) Hydrostatic test b) Pressure decay or leak test c) Visual inspection d) Flow test
  1. How should dry chemical powders be stored before use? a) In a humid area b) Near heat sources c) In a dry, sealed container d) Directly on the floor Moisture and contamination can degrade the chemical, reducing effectiveness.
  2. Which NFPA standard specifies inspection intervals for dry chemical systems? a) NFPA 10 b) NFPA 13 c) NFPA 17 d) NFPA 72 NFPA 17 covers installation, maintenance, and inspection schedules for dry chemical systems.
  3. What is the purpose of the system control panel in a dry chemical system? a) Store chemical agent b) Mount the cylinder c) Monitor system status and activate discharge d) Clean the nozzle The control panel allows monitoring and automatic activation in emergencies.
  4. Which of the following can cause dry chemical caking inside a cylinder? a) Low humidity b) Proper storage

c) Moisture ingress d) Correct agent type Moisture causes clumping that can block the discharge nozzle.

  1. How often must dry chemical cylinders be weighed to ensure proper agent quantity? a) Daily b) Monthly c) Annually or as per NFPA guidelines d) Never Periodic weighing ensures cylinders contain the correct amount of agent for effective fire suppression.
  2. What is the main hazard associated with dry chemical agent discharge? a) Electrical shock b) Respiratory irritation and reduced visibility c) Burns from heat d) Chemical explosion The powder can irritate the lungs and obscure vision during discharge.
  3. What is the proper procedure for testing a system’s alarm or signal during inspection? a) Ignore the alarm b) Activate without preparation c) Follow NFPA guidelines and notify occupants before testing d) Only test during an actual fire Prevention of false alarms and safety during testing is required.