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Key Facts: NV Fixed Fire Extinguishing Systems Exam

45 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

32 of 45 points

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-41B Fixed Fire Extinguishing Systems Contractor Examination is the official NSCB/PSI open book exam: 45 questions, 32 of 45 points, 1.5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV Fixed Fire Extinguishing Systems Practice Questions

Try these sample questions to review concepts for the NV Fixed Fire Extinguishing Systems exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under NFPA 17 (2009), what is a dry chemical extinguishing agent?
A.A powder of very small particles, usually sodium bicarbonate-, potassium bicarbonate-, or ammonium phosphate-based, treated to resist packing and moisture
B.A liquid potassium-acetate or potassium-citrate solution listed for commercial cooking
C.A liquefied compressed gas stored at 850 psi and 70°F
D.A protein hydrolysate mixed with water at 3 percent or 6 percent
Explanation: NFPA 17 (2009) defines dry chemical as a powder of very small particles, usually sodium bicarbonate-, potassium bicarbonate-, or ammonium phosphate-based, with additives that resist packing, moisture absorption (caking), and give proper flow. That definition is the C-41B dry-chemical agent, not wet chemical, carbon dioxide, or foam concentrate.
2Which dry chemical is the multipurpose (ABC) agent used on ordinary combustibles as well as flammable liquids and energized electrical equipment?
A.Sodium bicarbonate
B.Monoammonium phosphate
C.Potassium bicarbonate (Purple-K)
D.Urea-based potassium bicarbonate only
Explanation: Monoammonium phosphate is the multipurpose ABC dry chemical. It melts and coats Class A fuels and is also listed for Class B liquids and Class C energized electrical equipment. Sodium bicarbonate, potassium bicarbonate, and urea-based potassium bicarbonate are BC agents and do not provide that Class A coating action.
3What is a local-application dry chemical system under NFPA 17 (2009)?
A.A system that fills an entire enclosure to a uniform extinguishing concentration
B.A wheeled or hand-carried dry chemical extinguisher with no fixed piping
C.A supply of dry chemical permanently piped to nozzles that discharge directly onto the fire
D.A water-sprinkler system with dry-pipe valves and dry chemical additive
Explanation: NFPA 17 (2009) defines a local-application system as a supply of dry chemical permanently connected to fixed piping with nozzles arranged to discharge directly onto the fire. Total flooding fills an enclosure. Portable extinguishers and water sprinklers are outside that definition and, for water sprinklers, outside the C-41B scope.
4What is a total-flooding dry chemical system intended to do?
A.Cool a flammable-liquid surface with a floating aqueous film
B.Reduce oxygen in the room to about 15 percent using stored nitrogen
C.Deliver water through closed-head sprinklers at a listed density
D.Create a fire-extinguishing concentration of dry chemical in all parts of an enclosure
Explanation: NFPA 17 (2009) requires the quantity of dry chemical and the flow rate to be sufficient to create a fire-extinguishing concentration in all parts of the enclosure. The extinguishing action is transient, so sources of reignition must be considered. Film-forming foam, inert-gas oxygen reduction, and water sprinklers are different systems.
5Which expellant must be used when recharging a dry chemical extinguishing cylinder unless the manufacturer recommends otherwise?
A.Nitrogen or approved dry air
B.Carbon dioxide from a high-pressure cylinder
C.Ordinary shop compressed air with no dryer
D.Steam or moist plant air
Explanation: NAC 477.410 and NFPA 17 (2009) require nitrogen or approved dry air as the expellant for dry chemical unless the manufacturer specifies otherwise. Moisture in ordinary shop air cakes the powder and can freeze or clog the discharge path. Carbon dioxide is a different extinguishing agent, not the dry-chemical expellant.
6How often must the owner perform the NFPA 17 (2009) “quick check” inspection of a dry chemical system?
A.Only after a discharge
B.At least monthly
C.Once every 12 years at hydrostatic test
D.Only when the AHJ requests it
Explanation: NFPA 17 (2009) defines inspection as a quick check by the system owner that the system is in place, has not been actuated or tampered with, and has no obvious damage. That owner inspection is required at least monthly. Semiannual maintenance by a qualified person and 12-year hydrostatic testing are separate duties.
7What is a pre-engineered dry chemical system under NFPA 17 (2009) and NAC 477.180?
A.Any system whose pipe sizes are calculated from first principles on every job
B.A portable extinguisher mounted on a vehicle
C.A packaged, listed system installed only within the manufacturer’s pretested limitations
D.A foam-water deluge system listed to NFPA 16
Explanation: A pre-engineered system is a packaged set of listed components installed only within the manufacturer’s pretested limits — pipe size and length, fitting count, nozzle type and number, and protected volume or area. Engineered (special-hazard) systems are individually calculated. Foam-water deluge and portable extinguishers are different products.
8Why must personnel-warning devices be provided on many dry chemical total-flooding and local-application systems?
A.Dry chemical is always lethal at the listed design concentration
B.NFPA 17 requires a wintergreen odorizer on every dry chemical cylinder
C.Dry chemical reduces oxygen to below 12 percent in every enclosure
D.A dry chemical discharge can obscure vision and impair breathing in the protected space
Explanation: NFPA 17 (2009) requires alarms or other warning where personnel could be exposed to a discharge. The powder cloud sharply reduces visibility and can irritate the respiratory tract, so people must leave before or as the system operates. Dry chemical is not an asphyxiant like CO2 and does not use a wintergreen odorizer.
9Which Class B/C dry chemical is commonly called Purple-K?
A.Potassium bicarbonate
B.Sodium bicarbonate
C.Monoammonium phosphate
D.Potassium acetate wet chemical
Explanation: Purple-K is potassium bicarbonate-based dry chemical, a high-performance BC agent widely used on flammable-liquid and gas hazards such as fueling, dip tanks, and transformers. Sodium bicarbonate is ordinary BC, MAP is ABC, and potassium acetate is a wet chemical, not a dry chemical.
10For an NFPA 17 (2009) total-flooding enclosure, unclosable openings up to what fraction of the total enclosure surface (sides, top, and bottom) need no extra dry chemical?
A.5 percent
B.1 percent
C.15 percent
D.25 percent
Explanation: NFPA 17 (2009) allows unclosable openings up to 1 percent of the total area of the sides, top, and bottom with no compensation. Openings greater than 1 percent and not more than 5 percent take supplemental dry chemical of at least 0.5 lb/ft² through the regular system. Openings greater than 5 percent and not more than 15 percent take at least 1 lb/ft² applied simultaneously by local application over the openings.

About the NV Fixed Fire Extinguishing Systems Exam

The Nevada C-41B Fixed Fire Extinguishing Systems Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 45 scored questions. Passing is 32 of 45 points in 1.5 hours. The examination is open book. NFPA 11 (2016), NFPA 12 (2015), NFPA 17 (2009), and NFPA 2001 (2012) (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin 270, updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Exam sponsor: PSI Services LLC (for the Nevada State Contractors Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open Book computer-based multiple-choice. NFPA 11 (2016), NFPA 12 (2015), NFPA 17 (2009), and NFPA 2001 (2012) (allowed in center)

Time Limit

1.5 hours

Passing Score

32 of 45 points

Exam / Certification Fees

USD 95

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

31%

Dry Chemical Systems

Dry Chemical Systems (14 items)

27%

Carbon Dioxide Systems

Carbon Dioxide Systems (12 items)

16%

Foam Systems

Foam Systems (7 items)

16%

Clean Agent Systems

Clean Agent Systems (7 items)

11%

General Regulations

General Regulations (5 items)

Preparing for the NV Fixed Fire Extinguishing Systems Exam

What You Need to Know

  • Passing score: 32 of 45 points
  • Assessment: Open Book computer-based multiple-choice. NFPA 11 (2016), NFPA 12 (2015), NFPA 17 (2009), and NFPA 2001 (2012) (allowed in center)
  • Time limit: 1.5 hours
  • Exam / certification fees: USD 95 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NV Fixed Fire Extinguishing Systems: Suggested Study Strategy

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-41B Fixed Fire Extinguishing Systems Contractor Examination?

The official PSI examination has 45 scored questions. Passing is 32 of 45 points within 1.5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-41B exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-41B exam open book?

Yes. PSI lists this examination as open book. NFPA 11 (2016), NFPA 12 (2015), NFPA 17 (2009), and NFPA 2001 (2012) (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.