NFPA NFPA-CFPS Online Practice Questions and Exam Preparation

NFPA NFPA-CFPS Online Questions & Answers

• Question 1:

  Wet chemical extinguishing agents when sprayed on a grease fire, extinguish the fire by _____

  A. Smothering and cooling
  B. Removal of the radical free agent
  C. Radiation shielding
  D. Removal of the fuel
  A. Smothering and cooling

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  explanation:

  Explanation

  Wet chemical extinguishing agents, such as potassium acetate and potassium citrate, when sprayed on a grease fire, extinguish the fire by smothering and cooling. The wet chemical agent reacts with the hot grease and forms a layer of soap-like foam on the surface of the fat, which acts as an insulation between the hot grease and the atmosphere, preventing the escape of combustible vapors and oxygen supply.The wet chemical agent also absorbs heat from the grease and lowers its temperature below the ignition point

  References: What is the Difference Between a Wet and Dry Chemical Fire ... Wet Chemical (Class K) Fire Extinguisher - Portable - WFX

• Question 2:

  When using water mist as an extinguishing mechanism, the effectiveness of a fine mist depends on _____

  A. the ability of the mist to directly spray on the fire.
  B. how much mist diverts to the compartment boundaries.
  C. how much conductive heat the mist system will absorb.
  D. the momentum and direction of the spray relative to the fire.
  D. the momentum and direction of the spray relative to the fire.

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  explanation:

  Explanation

  When using water mist as an extinguishing mechanism, the effectiveness of a fine mist depends on the momentum and direction of the spray relative to the fire. The momentum and direction of the spray determine how well the mist can penetrate the fire plume and reach the flame zone, where the mist droplets can evaporate and cool the fire, displace oxygen, and dilute the fuel vapors. The mist spray should have sufficient momentum to overcome the buoyancy and entrainment of the fire plume, and the direction of the spray should be aligned with the fire plume to avoid deflection and dispersion. The ability of the mist to directly spray on the fire, how much mist diverts to the compartment boundaries, and how much conductive heat the mist system will absorb are not the main factors affecting the extinguishing effectiveness of a fine mist.

  References:Water Mist Systems Overview | NFPA;Engineering Relations for Water Mist Fire Suppression Systems;Effectiveness of Swirl Water Mist Nozzles for Fire Suppression

• Question 3:

  What is the background color used from the source to the outlets of a nitrous oxide medical gas system?

  A. Black
  B. Yellow
  C. Blue
  D. Gray/black
  C. Blue

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  explanation:

  Explanation

  The background color used from the source to the outlets of a nitrous oxide medical gas system is blue. This is the standard color coding for nitrous oxide cylinders and pipelines in medical gas pipeline systems. The color coding helps to

  identify the gas type and prevent accidental misconnections or cross-contamination. The color coding also indicates the pressure and flow characteristics of the gas system.

  References:

  Colour coding of copper pipes in Medical gas pipeline system according ... Doc 177 20 Medical Gas Cylinders Colour Coding - EIGA Medical Gas Coding Color Chart and

  Explanation - Bay Corporation Medical gases Health Technical

  Memorandum 02-01: Medical gas pipeline ...

• Question 4:

  Which foam extinguishing agent can be proportioned into final concentrations of 1%, 3%, and 6%?

  A. Film-Forming Fluoroprotein Agents (FFFP)
  B. Low-Temperature Foaming Agents
  C. Protein Foaming Agents (P)
  D. Aqueous Film-Forming Agents (AFFF)
  D. Aqueous Film-Forming Agents (AFFF)

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  explanation:

  Explanation

  Aqueous film-forming agents (AFFF) are synthetic foam concentrates that can be proportioned into final concentrations of 1%, 3%, and 6%, depending on the type of fuel and application method. AFFF forms a thin aqueous film on the surface

  of the flammable liquid, which prevents vapor release and provides rapid fire knockdown and extinguishment. AFFF is suitable for Class B fires involving hydrocarbon fuels such as gasoline, diesel, kerosene, etc.

  References:

  Fire Fighting Foams - Chemguard

  Extinguishing foam: types, operation and application areas

  [NFPA 11: Standard for Low-, Medium-, and High-Expansion Foam]

• Question 5:

  Which type of roof covering is most effective in preventing the spread of fires from flying brands?

  A. Class A
  B. Class B
  C. Class C
  D. Class D
  A. Class A

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  explanation:

  Explanation

  Class A roof coverings are the most effective in preventing the spread of fires from flying brands. Flying brands are burning embers or pieces of combustible material that are carried by the wind and can ignite other combustible materials or structures. Class A roof coverings are tested to withstand severe fire exposure from simulated fire sources, such as large burning brands, and do not produce flying brands themselves. Class A roof coverings include materials such as asphalt shingles, metal sheets, clay or concrete tiles, slate, and some types of synthetic membranes.

  References: Class A, B, and C Roof Ratings - UL Fire-Resistant Roofs - Fire Safe Marin

• Question 6:

  Which type of heat detector automatically resets after operation, when the ambient temperature drops below the operating temperature?

  A. Rate-of-Rise
  B. Rate compensation
  C. Electronic spot-type
  D. lonization
  A. Rate-of-Rise

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  explanation:

  Explanation

  A rate-of-rise heat detector is a type of heat detector that automatically resets after operation, when the ambient temperature drops below the operating temperature. This is because a rate-of-rise heat detector operates on a rapid rise in element temperature of 6.7° to 8.3°C (12° to 15°F) increase per minute, irrespective of the starting temperature If the temperature rise stops or reverses, the detector will reset itself and stop sending an alarm signal to the control panel A rateof-rise heat detector can also have a fixed temperature element that will trigger an alarm at a specified temperature, but this element is not selfresetting and requires replacement after activation

  References: Heat Detectors Selection Guide: Types, Features, Applications - GlobalSpec Heat detector - Wikipedia1

• Question 7:

  When evaluating the hydraulic properties of water for fire protection system, what is the measurement of a fluid's resistance to flow?

  A. Velocity
  B. Viscosity
  C. Pressure
  D. Density
  B. Viscosity

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  explanation:

  Explanation

  The measurement of a fluid's resistance to flow is calledviscosity.Viscosity is the property of a fluid that describes how easily it can deform or move when subjected to a shear stress, such as the force exerted by a pipe wall or a pump1. A fluid with high viscosity, such as honey, resists flow and requires more pressure to overcome the friction between its layers.A fluid with low viscosity, such as water, flows easily and has less frictional resistance2.Viscosity affects the hydraulic properties of water for fire protection systems, such as the flow rate, pressure loss, and pump power. Viscosity is usually expressed in units of pascal-second (Pa s) or centipoise (cP) for liquids, and is dependent on the temperature and composition of the fluid.

  References: Viscosity | Definition, Facts, Formula, Units, and Examples Viscosity ?The Physics Hypertextbook Fire Pump Types | NFPA

  [12.4: Viscosity and Laminar Flow; Poiseuille's Law]

• Question 8:

  The goals of the first edition of NFPA 13D were to provide sufficient time for safe egress or rescue, economic viability, and

  A. alert the fire department.
  B. limit water damage.
  C. limit damage to the dwelling.
  D. prevent flashover.
  C. limit damage to the dwelling.

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  explanation:

  Explanation

  the goals of the first edition of NFPA 13D were to provide sufficient time for safe egress or rescue, economic viability, and limit damage to the dwelling. The first edition of NFPA 13D was published in 1975 and was based on the concept of a "life safety" sprinkler system that was intended to protect the occupants of one- and two-family dwellings and manufactured homes from fire.The first edition of NFPA 13D stated that the system was not designed to protect the property or contents from fire damage, but rather to provide a tenable environment for escape or rescue.The first edition of NFPA 13D also recognized the need for economic viability of the system, and therefore allowed for reduced water supply and piping requirements compared to other sprinkler standards.The first edition of NFPA 13D did not explicitly state the goal of limiting damage to the dwelling, but it implied that the system would have some beneficial effect on the fire spread and severity by stating that the system was designed to prevent flashover in the room of fire origin.

  References: NFPA 13D: Standard for the Installation of Sprinkler Systems in One- and Two- Family Dwellings and Manufactured Homes, 1975 Edition, Section 1-11 Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.2.1.22

• Question 9:

  Which factor plays a significant role in most industrial fire and explosion losses?

  A. Process
  B. Mechanical
  C. Human
  D. External
  C. Human

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  explanation:

  Explanation

  The answer is

  C. Human factor plays a significant role in most industrial fire and explosion losses.According to a study by Allianz Global Corporate and Specialty (AGCS), human error is the cause of 80% of all industrial accidents, including fires and explosions1. Human error can include mistakes, negligence, violations, or sabotage. Some examples of human errors that can lead to fires and explosions are: Improper handling or storage of flammable or combustible materials Failure to follow safety procedures or regulations Lack of training or supervision Poor maintenance or inspection of equipment or machinery Ignoring or disabling alarms or warning systems Smoking or using open flames near hazardous areas Intentional or accidental ignition of explosives or incendiaries To prevent or reduce the impact of human errors, industrial facilities should implement effective risk management strategies, such as: Providing regular and adequate training and education for workers and managers Establishing and enforcing clear and consistent safety policies and rules Conducting thorough and frequent audits and inspections Installing and maintaining reliable fire protection systems and equipment Developing and practicing emergency response and evacuation plans Encouraging a positive safety culture and communication among all stakeholders

• Question 10:

  After an emergency incident has occurred, a post-incident critique of the emergency preparedness procedure shouldbe conducted covering the detection of the incident, implementation of incident command, and

  A. cause of the incident.
  B. notification, alerting and warning procedures.
  C. total time of the incident.
  D. where the incident occurred.
  B. notification, alerting and warning procedures.

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  explanation:

  Explanation

  After an emergency incident has occurred, a post-incident critique of the emergency preparedness procedure should be conducted covering the detection of the incident, implementation of incident command, andnotification, alerting and

  warning procedures. These are some of the key elements of an effective emergency response that need to be evaluated and improved after an incident.A post-incident critique is a systematic review of the actions and decisions taken during

  an emergency incident, with the aim of identifying lessons learned, best practices, gaps, and corrective actions.A post-incident critique should involve all the relevant stakeholders, such as emergency responders, emergency managers, facility

  managers, and affected community members.A post- incident critique should also follow a structured format, such as the one suggested by the Federal Emergency Management Agency (FEMA):

  Introduction: The facilitator introduces the purpose, objectives, ground rules, and agenda of the critique session.

  Incident Overview: The facilitator provides a brief summary of the incident, including the date, time, location, type, size, and impact of the incident. Timeline Review: The facilitator leads a chronological review of the major events and actions

  that occurred during the incident, using a timeline or a log as a reference.

  Strengths and Areas for Improvement: The facilitator solicits feedback from the participants on what went well and what needs to be improved, focusing on the following topics:

  Action Plan: The facilitator summarizes the main findings and recommendations from the critique session, and assigns responsibilities and deadlines for implementing the corrective actions.

  Conclusion: The facilitator thanks the participants for their contributions, and provides information on how the results of the critique will be documented and shared.