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100+ Free MS Alarm Systems Practice Questions

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2026 Statistics

Key Facts: MS Alarm Systems Exam

70%

Passing Score

PSI MS Contractor Bulletin 4/23/2026

60 Q

Official Exam Questions

PSI MS Contractor Bulletin 4/23/2026

2 hours

Time Allowed

PSI MS Contractor Bulletin 4/23/2026

$120

PSI Exam Fee

PSI MS Contractor Bulletin 4/23/2026

Open book

Exam Format

PSI MS Contractor Bulletin 4/23/2026

MS Alarm Systems PSI trade exam: 60 questions, 70% pass, 2 hours, fee $120. Open-book MSBOC classification (bulletin 4/23/2026).

Sample MS Alarm Systems Practice Questions

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

1A 24-volt DC power-limited alarm circuit draws 80 milliamperes. What is the circuit resistance?
A.0.30 ohms
B.3.0 ohms
C.30 ohms
D.300 ohms
Explanation: Ohm's law is R = V / I. Convert 80 milliamperes to 0.080 amperes, then divide 24 volts by 0.080 amperes to get 300 ohms. Low-voltage alarm work uses this relationship constantly when checking loads, end-of-line resistors, and unexpected current draw.
2Two notification appliances are wired in series on a supervised low-voltage circuit. Which statement is correct?
A.Each appliance receives the full source voltage.
B.The same current flows through both appliances.
C.An open in one appliance leaves the other operating normally.
D.Total resistance is less than the smaller appliance resistance.
Explanation: In a series circuit the same current flows through every device, and the source voltage divides across the resistances. Fire and intrusion notification appliances are normally wired in parallel on a notification circuit so each device sees full voltage; a series connection would drop voltage at each device and an open would silence everything downstream.
3Under NEC Article 725, what is the primary safety reason Class 2 circuits are treated differently from power circuits?
A.Class 2 wiring is exempt from all listing requirements.
B.The power source is limited so the circuit presents a reduced fire-initiation and electric-shock hazard.
C.Class 2 circuits may be run in the same cable as 480-volt feeders.
D.Class 2 circuits must operate only on alternating current.
Explanation: NEC Article 725 defines Class 2 as a power-limited circuit. Because the listed source limits voltage and available energy, the Code treats the circuit as having a reduced fire-initiation hazard and acceptable shock protection. That is why Class 2 methods, cable types, and overcurrent rules differ from Chapters 1 through 4 power wiring.
4NEC Article 760 divides fire alarm circuits into which two categories?
A.Class 1 and Class 2
B.Primary and secondary
C.Power-limited fire alarm (PLFA) and non-power-limited fire alarm (NPLFA)
D.Initiating and indicating
Explanation: Article 760 classifies fire alarm circuits as power-limited (PLFA), supplied by a source complying with 760.121, or non-power-limited (NPLFA), supplied by a source complying with 760.41 and 760.43. Cable types, overcurrent protection, and wiring methods follow that classification. Class 1 and Class 2 are Article 725 terms, not the Article 760 pair.
5Which power-limited fire alarm cable type is listed for use in ducts and plenums used for environmental air?
A.FPL
B.FPLR
C.FPLP
D.CM
Explanation: FPLP is power-limited fire alarm plenum cable and is the Article 760 type listed for environmental-air plenums. FPL is general-purpose and FPLR is riser-rated; neither substitutes upward into a plenum. Communications cable type CM is not a fire-alarm listing and is not the correct substitution for FPLP in a required fire alarm circuit.
6A 24-volt DC notification circuit uses 18 AWG copper with a resistance of 6.5 ohms per 1,000 feet. The one-way run is 150 feet and the load is 0.40 A. What is the round-trip voltage drop?
A.0.39 volts
B.0.78 volts
C.1.56 volts
D.3.90 volts
Explanation: DC voltage drop on a two-wire run is VD = 2 × I × R × L / 1,000. Substituting gives 2 × 0.40 × 6.5 × 150 / 1,000 = 0.78 volts. The factor of 2 accounts for the outgoing and return conductors. Leaving that factor out understates the drop by half.
7A dedicated 120-volt branch circuit supplies only the fire alarm control unit. How must the disconnecting means be identified under NEC Article 760?
A.Any unmarked breaker in the nearest lighting panel is acceptable.
B.The disconnect must be accessible only to qualified personnel, identified in red, and marked as the fire alarm circuit.
C.The disconnect must be a GFCI breaker so ground faults silence the system.
D.The disconnect must be locked in the OFF position during occupancy.
Explanation: Article 760 requires the fire alarm equipment branch circuit to supply no other loads. The disconnecting means must be accessible only to qualified persons, identified in red, and marked to indicate it is the fire alarm circuit, and its location must be identified at the control unit. Those rules keep the system from being turned off by an ordinary lighting or receptacle breaker.
8Compared with a Class 2 circuit, a Class 3 circuit under NEC Article 725 is best described as which of the following?
A.A non-power-limited 600-volt power circuit
B.A power-limited circuit that permits higher voltage and therefore requires additional shock-protection safeguards
C.A circuit that may never use listed cable
D.A circuit limited to battery power only
Explanation: Class 2 and Class 3 are both power-limited under Article 725. Class 3 sources may operate at higher voltage than typical Class 2 sources, so the Code adds insulation, listing, and installation safeguards against electric shock. Neither class is a 600-volt building power circuit.
9What is the primary purpose of the equipment grounding conductor on a 120-volt fire alarm or security power supply?
A.To carry normal operating current back to the source
B.To provide a low-impedance path for fault current so the overcurrent device can clear a ground fault
C.To reduce voltage drop on the notification appliance circuit
D.To serve as the signaling return for initiating devices
Explanation: The equipment grounding conductor is a safety conductor. It bonds non-current-carrying metal parts to the grounding system so a ground fault produces enough current to open the breaker or fuse. It is not the grounded (neutral) conductor and it is not used as a signaling or notification return.
10Alarm cables pass through a fire-resistance-rated corridor wall. What does the NEC require at that penetration?
A.Leave the opening oversized so future cables can be added.
B.Firestop the opening with an approved method that restores the wall rating.
C.Sleeve the cables with ordinary PVC and leave the annulus open.
D.No sealing is required if the cables are power-limited.
Explanation: NEC 300.21 requires openings around electrical penetrations of fire-resistance-rated walls, partitions, floors, or ceilings to be firestopped using approved methods. Power-limited status does not waive that rule. An open annulus would let fire and smoke bypass the rated assembly.

About the MS Alarm Systems Exam

Mississippi Alarm Systems and Equipment Contractor Examination is a classification trade examination administered by PSI for the Mississippi State Board of Contractors. The official open-book exam has 60 questions, a 70% passing standard, and 2 hours allowed. PSI examination fee is $120 per portion (bulletin updated 4/23/2026). This English-language MCQ bank is a study aid for the official content outline; it is not an official PSI form, does not replace the required Law and Business Management exam, and is not a substitute for MSBOC application review or the official open-book examination.

Questions

60 scored questions

Time Limit

2 hours

Passing Score

70%

Exam Fee

$120 (PSI Services LLC (for Mississippi State Board of Contractors))

MS Alarm Systems Exam Content Outline

17%

General Electrical and Low Voltage

Electrical and low-voltage fundamentals for alarm work

53%

Fire Detection and Notification

Fire alarm detection, notification, and NFPA 72 topics

30%

Intrusion Detection and Notification

Intrusion detection and security notification systems

How to Pass the MS Alarm Systems Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 60 questions
  • Time limit: 2 hours
  • Exam fee: $120

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

MS Alarm Systems Study Tips from Top Performers

1Study only the approved references listed for this classification in the current PSI Mississippi Contractor bulletin (updated 4/23/2026)
2Practice open-book navigation with permanent tabs and indexes before test day
3Drill OSHA 29 CFR 1926 topics that appear across nearly every trade outline
4Confirm MSBOC classification scope and eligibility at msboc.us before scheduling with PSI
5All applicants must also pass Law and Business Management unless it is waived

Frequently Asked Questions

How many questions are on the MS Alarm Systems exam?

The official PSI examination has 60 scored questions (plus possible unscored experimental items). Passing is 70% within 2 hours.

How much does the MS Alarm Systems exam cost?

PSI lists $120 per examination portion (Candidate Information Bulletin updated 4/23/2026). MSBOC application fees are separate: $400 commercial or $50 residential. Additional classifications are $100 each.

Is the Mississippi contractor exam open book?

Yes. PSI administers MSBOC classification exams as open book. Only bulletin-listed approved references are allowed; temporary tabs such as Post-it notes are prohibited.

Do I still need the Law and Business Management exam?

Yes. MSBOC requires the Mississippi Law and Business Management exam (50 questions, 70%, 2 hours) of all applicants. Reciprocity may waive a trade exam in some cases but does not waive Law and Business.