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100+ Free NV Fire Detection Specialty Practice Questions

Prepare for the Nevada C-41C Fire Detection Contractor Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: NV Fire Detection Specialty Exam

55 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

39 of 55 points

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2 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-41C Fire Detection Contractor Examination is the official NSCB/PSI open book exam: 55 questions, 39 of 55 points, 2 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV Fire Detection Specialty Practice Questions

Try these sample questions to test your NV Fire Detection Specialty exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On a 24-volt DC initiating circuit, a conventional smoke detector draws 45 mA in alarm. What is the detector's equivalent resistance while in alarm?

A.1.08 ohms

B.533 ohms

C.108 ohms

D.5,333 ohms

Explanation: Ohm's law is R = V / I. Convert 45 mA to 0.045 A, then 24 V / 0.045 A = 533 ohms. C-41C installers use this check when a published alarm current must be consistent with the circuit voltage before currents are added for battery and voltage-drop calculations.

2Four identical 24-volt horn-strobes are connected in parallel. Each draws 80 mA in alarm. What is the total alarm current the notification-appliance circuit must supply?

A.80 mA

B.20 mA

C.320 mA

D.1.92 A

Explanation: Parallel loads share voltage and their currents add. 4 × 80 mA = 320 mA (0.32 A). Notification-appliance circuits on a C-41C fire-detection system are sized for that summed alarm current, plus any booster or power-supply reserve required by the listing.

3A 24-volt notification appliance draws 180 mA while sounding and flashing. How much power does it consume?

A.4.32 watts

B.0.13 watt

C.43.2 watts

D.133 watts

Explanation: Electrical power is P = V × I. 24 V × 0.180 A = 4.32 W. Power-supply and battery worksheets add these wattage or current figures for every appliance that operates in alarm.

4In the AWG system used on C-41C fire-detection circuits, which copper conductor has the lowest resistance per 1,000 feet?

A.18 AWG

B.16 AWG

C.14 AWG

D.22 AWG

Explanation: A smaller AWG number is a larger conductor. 14 AWG copper has more cross-section than 16, 18, or 22 AWG, so it has the lowest resistance per 1,000 feet and the least voltage drop for a given current and length. Notification runs that carry high alarm current are often upsized for that reason.

5A 24.0-volt control-unit output feeds a notification circuit whose total conductor resistance is 2.4 ohms. Alarm current is 1.25 A. What voltage remains at the last appliance?

A.21.0 V

B.22.8 V

C.24.0 V

D.27.0 V

Explanation: DC voltage drop is I × R = 1.25 A × 2.4 Ω = 3.0 V. Voltage at the last appliance is 24.0 − 3.0 = 21.0 V. NFPA 72 (2013) requires every notification appliance to receive a voltage within the manufacturer's published operating range under worst-case alarm load.

6On a conventional Class B initiating-device circuit that uses an end-of-line resistor, which condition typically produces a trouble signal rather than an alarm?

A.A detector's alarm contacts closing across the pair

B.An open conductor or a missing end-of-line resistor

C.A waterflow switch reaching its retard and closing

D.A manual fire-alarm box being pulled

Explanation: Supervisory current on a conventional Class B initiating circuit flows through the end-of-line resistor. An open conductor or a removed end-of-line resistor stops that current and the control unit reports trouble. A low-resistance closure across the pair is the alarm condition.

7Why are most listed 24-volt notification appliances polarized on a C-41C notification-appliance circuit?

A.So they draw alarm current only when the pair is at the correct polarity, which also allows reverse-polarity supervision

B.So they can be powered from either 24 volts DC or 120 volts AC without a rectifier

C.So candela output doubles if the pair is reversed

D.So the appliances can share a conductor with 120-volt lighting

Explanation: A series diode (or equivalent) lets the appliance draw alarm current only with the correct polarity. The control unit can reverse polarity for supervision on some circuit styles, or simply supervise through an end-of-line device, without the appliances sounding. Reversing the pair at a single appliance leaves that appliance silent.

8A C-41C installer measures continuity on a de-energized notification pair and reads nearly 0 ohms between the two conductors, with the end-of-line device disconnected. What does that reading indicate?

A.A healthy open pair ready for the end-of-line device

B.A short between the two circuit conductors

C.Normal insulation resistance to earth

D.That the pair is still energized at 24 volts

Explanation: With the end-of-line device off the pair, a healthy circuit is open (infinite or very high ohms) between the two conductors. A near-zero reading means the conductors are shorted together. That fault must be cleared before the circuit can be supervised or operated.

9A 24-volt notification circuit uses 400 feet of 16 AWG copper pair. Uncoated 16 AWG copper is 4.02 ohms per 1,000 feet per conductor. Alarm current is 1.50 A. What is the approximate voltage drop in the pair?

A.1.2 V

B.2.4 V

C.4.8 V

D.9.6 V

Explanation: Round-trip length is 2 × 400 ft = 800 ft. Resistance is 800 / 1,000 × 4.02 Ω = 3.22 Ω. Voltage drop is 1.50 A × 3.22 Ω ≈ 4.83 V, about 4.8 V. The installer then subtracts that drop from the control-unit output and compares the result with the appliance's minimum listed voltage.

10Which NEC 2017 article governs the installation of wiring and equipment for fire-alarm systems, including circuits controlled and powered by the fire-alarm system?

A.Article 250

B.Article 700

C.Article 725 only

D.Article 760

Explanation: NEC 2017 Article 760, Fire Alarm Systems, is the article C-41C installers open for power-limited and non-power-limited fire-alarm circuits, identification, abandoned cable, and the fire-alarm branch circuit. Articles 250, 700, and 725 apply only to the extent Article 760 references them.

About the NV Fire Detection Specialty Exam

The Nevada C-41C Fire Detection Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 55 scored questions. Passing is 39 of 55 points in 2 hours. The examination is open book. National Electrical Code, 2017 and NFPA 72, 2013 (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.

Assessment

Open Book computer-based multiple-choice. National Electrical Code, 2017 and NFPA 72, 2013 (allowed in center)

Time Limit

2 hours

Passing Score

39 of 55 points

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV Fire Detection Specialty Exam Content Outline

9%

General Electrical Knowledge

General Electrical Knowledge (5 items)

15%

Wiring

Wiring (8 items)

5%

Grounding

Grounding (3 items)

9%

Power Supply

Power Supply (5 items)

27%

Detectors

Detectors (15 items)

25%

Alarms Notification

Alarms Notification (14 items)

9%

General Regulations

General Regulations (5 items)

How to Pass the NV Fire Detection Specialty Exam

What You Need to Know

Passing score: 39 of 55 points
Assessment: Open Book computer-based multiple-choice. National Electrical Code, 2017 and NFPA 72, 2013 (allowed in center)
Time limit: 2 hours
Exam fee: USD 95

Keys to Passing

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 Fire Detection Specialty Study Tips from Top Performers

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-41C Fire Detection Contractor Examination?

The official PSI examination has 55 scored questions. Passing is 39 of 55 points within 2 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-41C 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-41C exam open book?

Yes. PSI lists this examination as open book. National Electrical Code, 2017 and NFPA 72, 2013 (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.