CFPS Exam Free Questions: 20 Practice Questions with Answers and Exam Traps

Below are 20 free CFPS practice questions taken from the TPFE CFPS course question bank. Each one shows the correct answer, a short explanation, the NFPA Fire Protection Handbook reference (section, chapter and page) and the exam trap that catches most candidates. Like the real exam, they test whether you can find and understand the handbook, not long calculations.

Take the free CFPS Exam Simulator →

Video: CFPS Exam Preparation, how to prepare and pass the CFPS exam (TPFE lecture).

How to use these questions

• Answer all 5 questions in a set before you read the answers.
• Find each answer in your handbook. The page references below match the course bank.
• After each set, take one exam in the free simulator.
• New to the exam? Read the CFPS Exam Guide first.

Set 1: Fire science and hazardous materials

Question 1. Upward flame spread on a vertical surface, where the flame moves in the same direction as the hot gas flow, is called:

• A. Opposed-flow flame spread
• B. Concurrent flame spread
• C. Lateral flame spread
• D. Counter-current smoldering

Correct answer: B. Concurrent flame spread

Explanation: Upward (wind-aided) spread is concurrent: the flame and the buoyant gas flow move the same way, so it preheats the fuel ahead and spreads fast. Downward and lateral spread are opposed-flow.

Handbook reference: Section 2, Chapter 2, p. 2-23

Exam trap: Mixing up concurrent and opposed-flow. Ask: do the flame and the gas flow move the same way? If yes, it is concurrent.

Question 2. Which list gives the four stages of an enclosure fire in the right order?

• A. Ignition, flashover, fully developed, decay
• B. Incipient, growth, steady state, decay
• C. Smoldering, flaming, flashover, extinction
• D. Growth, flashover, steady state, burnout

Correct answer: B. Incipient, growth, steady state, decay

Explanation: The handbook describes an enclosure fire as incipient, growing, steady state (fully developed) and decay.

Handbook reference: Section 2, Chapter 4, p. 2-52

Exam trap: Picking an answer with flashover in it. Flashover is the transition into the steady-state stage, not one of the four stages.

Question 3. Inerting a vessel to prevent an explosion works mainly by reducing the:

• A. Fuel concentration
• B. Ignition energy
• C. Oxidant (oxygen) concentration
• D. Vessel pressure

Correct answer: C. Oxidant (oxygen) concentration

Explanation: Inerting adds an inert gas (nitrogen, CO₂) until the oxygen level is below the limiting oxidant concentration, so no flammable mixture can form.

Handbook reference: Section 7, Chapter 2, p. 7-26

Exam trap: Choosing fuel concentration. Inerting does not remove the fuel; it removes the oxygen.

Question 4. Under NFPA definitions, a liquid with a flash point at or above 100°F (37.8°C) is a:

• A. Flammable liquid
• B. Combustible liquid
• C. Class IB liquid
• D. Pyrophoric liquid

Correct answer: B. Combustible liquid

Explanation: Liquids with a flash point of 100°F (37.8°C) or higher are combustible liquids (Class II and III). Below 100°F they are flammable (Class I).

Handbook reference: Section 6, Chapter 12, p. 6-198

Exam trap: Thinking combustible means more hazardous than flammable. In NFPA language, flammable liquids are the more hazardous group.

Question 5. What type of electrical equipment is required in a Class I, Division 1 hazardous (classified) location?

• A. General-purpose equipment
• B. Dust-ignition-proof equipment
• C. Intrinsically safe equipment
• D. Weatherproof equipment

Correct answer: C. Intrinsically safe equipment

Explanation: In Class I, Division 1 an ignitable gas or vapour can be present in normal operation, so equipment must not be able to ignite it, for example intrinsically safe circuits (or explosionproof enclosures).

Handbook reference: Section 8, Chapter 13, p. 8-169

Exam trap: Picking dust-ignition-proof. That protection is for Class II (combustible dust) locations, not Class I (gases and vapours).

Finished Set 1? Take Practice Exam 1 in the free CFPS Exam Simulator →

Set 2: Detection and alarm

Question 6. A signal that tells occupants or staff about a fault in the fire alarm system, such as an open circuit, is a:

• A. Alarm signal
• B. Supervisory signal
• C. Trouble signal
• D. Pre-alarm signal

Correct answer: C. Trouble signal

Explanation: A trouble signal shows a fault in a monitored circuit or component. A supervisory signal shows an off-normal condition in a protection system (for example a closed sprinkler valve).

Handbook reference: Section 14, Chapter 1, p. 14-5

Exam trap: Mixing up trouble and supervisory. Trouble = the alarm system itself has a problem; supervisory = something it watches is off-normal.

Question 7. Which detector type responds best to the low-energy, smoldering fire signature (large visible smoke particles)?

• A. Ionization smoke detector
• B. Photoelectric smoke detector
• C. Fixed-temperature heat detector
• D. UV flame detector

Correct answer: B. Photoelectric smoke detector

Explanation: Photoelectric detectors respond better to the larger, visible particles from low-energy smoldering fires. Ionization detectors respond better to the small particles from fast, flaming fires.

Handbook reference: Section 14, Chapter 2, p. 14-21

Exam trap: Picking ionization because it is the most common smoke detector. Match the detector to the particle size, not to popularity.

Question 8. A rate-of-rise heat detector typically operates when the temperature rises faster than about:

• A. 5°F (3°C) per minute
• B. 12–15°F (7–8°C) per minute
• C. 30°F (17°C) per minute
• D. 50°F (28°C) per minute

Correct answer: B. 12–15°F (7–8°C) per minute

Explanation: Rate-of-rise detectors usually operate at a rise of about 12–15°F per minute, whatever the starting temperature. They also reset after operation.

Handbook reference: Section 14, Chapter 2, p. 14-17

Exam trap: Answering with a fixed temperature. A rate-of-rise detector reacts to speed of rise, not to a set temperature.

Question 9. For heat detectors on a smooth ceiling 30 ft (9.1 m) high, the listed spacing must be multiplied by about:

• A. 1.00
• B. 0.70
• C. 0.34
• D. 0.50

Correct answer: C. 0.34

Explanation: Heat rising to a high ceiling is diluted and cooled, so the listed spacing is reduced with ceiling height. At 30 ft the multiplier is 0.34.

Handbook reference: Section 14, Chapter 2, p. 14-27

Exam trap: Using 0.7. That is the "0.7 × S" coverage rule for the furthest point, not the ceiling-height reduction.

Question 10. Smoke alarms in one- and two-family dwellings should be replaced when they are:

• A. 5 years old
• B. 8 years old
• C. 10 years old
• D. 15 years old

Correct answer: C. 10 years old

Explanation: Smoke alarms should be replaced no later than 10 years from the date of manufacture, even if they still respond to a test.

Handbook reference: Section 14, Chapter 5, p. 14-86

Exam trap: Thinking a passed test means the alarm can stay. Age is a replacement trigger on its own.

Finished Set 2? Take Practice Exam 2 in the free CFPS Exam Simulator →

Set 3: Water supplies and suppression

Question 11. On a fire pump test, the overload point is defined as:

• A. 100% of rated flow at 100% of rated head
• B. 150% of rated flow at not less than 65% of rated total head
• C. 150% of rated flow at not less than 50% of rated head
• D. Churn at not more than 140% of rated head

Correct answer: B. 150% of rated flow at not less than 65% of rated total head

Explanation: At 150% of rated capacity the pump must still give at least 65% of its rated total head. Churn (no flow) must not exceed 140% of rated head.

Handbook reference: Section 15, Chapter 6, p. 15-92

Exam trap: Picking the churn limit. Churn is the zero-flow point; overload is the 150% flow point.

Question 12. In sprinkler hydraulic design, the minimum operating pressure at any sprinkler is generally:

• A. 5 psi (0.34 bar)
• B. 7 psi (0.48 bar)
• C. 10 psi (0.69 bar)
• D. 15 psi (1.0 bar)

Correct answer: B. 7 psi (0.48 bar)

Explanation: A minimum of 7 psi at the sprinkler gives a properly developed spray pattern, unless the sprinkler listing requires more.

Handbook reference: Section 15, Chapter 4, p. 15-66

Exam trap: Choosing a higher round number. 7 psi is the general minimum; special sprinklers (ESFR, some storage sprinklers) need more by listing.

Question 13. The most important extinguishing mechanism of dry chemical agents is:

• A. Cooling
• B. Smothering
• C. Chain-breaking reaction (flame inhibition)
• D. Radiation shielding

Correct answer: C. Chain-breaking reaction (flame inhibition)

Explanation: Dry chemicals work mainly by interrupting the chemical chain reaction in the flame. Smothering, cooling and radiation shielding add a little.

Handbook reference: Section 17, Chapter 2, p. 17-19

Exam trap: Choosing smothering because the powder "covers" the fire. That effect is minor compared with chain breaking.

Question 14. A multipurpose (ABC) dry chemical extinguisher uses:

• A. Sodium bicarbonate
• B. Potassium bicarbonate
• C. Monoammonium phosphate
• D. Potassium chloride

Correct answer: C. Monoammonium phosphate

Explanation: Monoammonium phosphate melts and forms a coating on Class A fuels, which is why it is rated A, B and C.

Handbook reference: Section 17, Chapter 1, p. 17-6

Exam trap: Picking a bicarbonate. Sodium and potassium bicarbonate are B:C agents with no Class A rating.

Question 15. Halocarbon clean agent systems are designed to discharge their agent within about:

• A. 10 seconds
• B. 30 seconds
• C. 60 seconds
• D. 2 minutes

Correct answer: A. 10 seconds

Explanation: A fast discharge (about 10 seconds for halocarbon agents) limits the time the agent spends in the flame, which limits decomposition products.

Handbook reference: Section 17, Chapter 6, p. 17-179

Exam trap: Confusing it with inert gas systems, which discharge more slowly (about 60 seconds), or with CO₂ systems.

Finished Set 3? Take Practice Exam 3 in the free CFPS Exam Simulator →

Set 4: Life safety and building construction

Question 16. Under NFPA 220 construction types, Type V construction is:

• A. Fire-resistive
• B. Noncombustible
• C. Heavy timber
• D. Wood frame

Correct answer: D. Wood frame

Explanation: Type V is wood frame construction: structural elements are wholly or partly wood or other approved combustible material.

Handbook reference: Section 19, Chapter 1, p. 19-8

Exam trap: Picking heavy timber. Heavy timber is Type IV, not Type V.

Question 17. Structural steel loses a large part of its strength at about:

• A. 300°C (570°F)
• B. 538°C (1000°F)
• C. 800°C (1470°F)
• D. 1100°C (2010°F)

Correct answer: B. 538°C (1000°F)

Explanation: Steel loses a large part of its load-carrying strength at about 538°C (1000°F), which is why exposed steel needs fire protection.

Handbook reference: Section 19, Chapter 2, p. 19-51

Exam trap: Thinking steel must melt to fail. It loses strength long before it melts (about 1500°C).

Question 18. The Steiner tunnel test (ASTM E84 / UL 723) for flame spread of interior finish lasts:

• A. 5 minutes
• B. 10 minutes
• C. 20 minutes
• D. 30 minutes

Correct answer: B. 10 minutes

Explanation: The tunnel test exposes the specimen for 10 minutes and gives a flame spread index and a smoke-developed index.

Handbook reference: Section 18, Chapter 2, p. 18-26

Exam trap: Confusing it with fire resistance tests (ASTM E119), which run for hours. The tunnel test measures surface flame spread, not fire resistance.

Question 19. The force needed to release the latch of a door in a means of egress should not exceed:

• A. 5 lbf (22 N)
• B. 15 lbf (67 N)
• C. 30 lbf (133 N)
• D. 50 lbf (222 N)

Correct answer: B. 15 lbf (67 N)

Explanation: The latch must release with no more than 15 lbf. Separate, higher limits apply to setting the door in motion and opening it fully.

Handbook reference: Section 4, Chapter 3, p. 4-84

Exam trap: Picking 30 lbf. That is the limit to set the door in motion, not to release the latch.

Question 20. Emergency lighting for a means of egress must operate for at least:

• A. 30 minutes
• B. 1 hour
• C. 1½ hours (90 minutes)
• D. 2 hours

Correct answer: C. 1½ hours (90 minutes)

Explanation: Emergency lighting must give the required illumination for at least 1½ hours after normal power fails.

Handbook reference: Section 4, p. 4-89

Exam trap: Picking 1 hour. The required duration is 1½ hours, so a 1-hour battery unit does not comply.

How did you score?

These 20 questions are a small sample. The CFPS exam preparation course has 600+ practice questions, 3 mock exams and 25 hours of lectures, for USD 350. More than 200 engineers from 26 countries have used it, with a 94% pass rate. Need the book? Read how to get the NFPA Fire Protection Handbook, 21st Edition. Not sure CFPS is for you? Read Is CFPS certification worth it? and the top 5 CFPS questions.

CFPS exam free questions: FAQ

Are these the real CFPS exam questions? No. NFPA does not publish its exam questions. These are practice questions from the TPFE CFPS course question bank, written in the exam style and referenced to the NFPA Fire Protection Handbook.

How many questions are on the CFPS exam? 100 multiple-choice questions in 3 hours, taken at a test centre. It is open book: you may bring an original printed copy of the NFPA Fire Protection Handbook, 21st Edition.

Is there a free CFPS practice exam? Yes. The free TPFE CFPS Exam Simulator has 3 practice exams of 10 questions each, with answers and exam traps.

Are there many calculations on the CFPS exam? Most CFPS questions test whether you can find and apply information in the handbook, such as definitions, limits, tables and classifications. Practise finding answers in the book quickly.

How much does the CFPS exam cost? The fee is USD 499. You can retake up to 2 times a year at USD 249 each.

Sources

• NFPA, Fire Protection Handbook, 21st Edition: section, chapter and page shown under each question
• NFPA, official CFPS practice exam
• TPFE CFPS course question bank