TENNESSEE ALARM SYSTEMS QUALIFYING AGENT EXAM –
EXAM PRACTICE QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALE 2026 Q&A | INSTANT
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I. General Knowledge and Theory — Questions 1–10
1. What is the primary purpose of a fire alarm control unit in a fire alarm system?
A) To receive system inputs, process them, and control appropriate outputs
B) To supply normal building lighting
C) To replace all emergency power sources
D) To provide mechanical ventilation only
Correct Answer: A) To receive system inputs, process them, and control appropriate outputs
Rationale: The fire alarm control unit is the central processing component of a fire alarm system. It
receives signals from initiating devices and supervises system conditions, then operates notification
or other controlled outputs as required. It does not replace building electrical distribution, emergency
generators, or mechanical systems.
2. Which condition most directly represents an open circuit in a supervised fire alarm initiating
circuit?
A) A normal alarm condition
B) A loss of circuit continuity
C) An increase in speaker volume
D) A short-term increase in battery capacity
Correct Answer: B) A loss of circuit continuity
Rationale: An open circuit interrupts electrical continuity and, when the circuit is supervised, normally
produces a trouble indication. Supervision allows the control unit to detect wiring faults rather than
silently losing protection. An alarm signal and a trouble signal represent different system conditions.
3. What is the principal electrical relationship expressed by Ohm's law?
A) Power equals voltage divided by resistance
B) Resistance equals current multiplied by voltage
C) Current equals voltage divided by resistance
D) Voltage equals resistance divided by current
Correct Answer: C) Current equals voltage divided by resistance
Rationale: Ohm's law is expressed as I = E/R, where current equals voltage divided by resistance. This
relationship is useful when evaluating circuit loading, voltage drop, and electrical characteristics.
Understanding the relationship helps a fire alarm professional evaluate whether a circuit can operate
properly under expected conditions.
4. A 24-volt circuit has a resistance of 120 ohms. Approximately how much current flows?
,A) 0.02 A
B) 0.20 A
C) 2.0 A
D) 5.0 A
Correct Answer: B) 0.20 A
Rationale: Applying Ohm's law gives I = E/R = 24/120 = 0.20 amperes. The result is substantially less
than one ampere. Being able to perform basic electrical calculations is important when evaluating
circuit loading and determining whether connected equipment remains within its rated operating
parameters.
5. Which statement best describes voltage?
A) The opposition to current flow
B) The rate at which electrical energy is consumed
C) The quantity of electrons stored in a conductor
D) The electrical potential difference that drives current
Correct Answer: D) The electrical potential difference that drives current
Rationale: Voltage represents electrical potential difference and provides the force that can drive
current through a circuit. Resistance opposes current, while power describes the rate of electrical
energy transfer. Distinguishing these fundamental quantities is necessary for troubleshooting and
calculating fire alarm circuit performance.
6. What is the primary function of a fuse or circuit breaker?
A) Protect conductors and equipment against excessive current
B) Increase available circuit voltage
C) Provide alarm notification automatically
D) Supervise every initiating device individually
Correct Answer: A) Protect conductors and equipment against excessive current
Rationale: Overcurrent protective devices interrupt a circuit when current becomes excessive under
specified conditions. Their purpose is protection rather than system supervision or alarm notification.
Proper overcurrent protection helps limit damage to conductors and connected equipment resulting
from abnormal electrical conditions.
7. What happens to total resistance when two resistors of equal value are connected in series?
A) It becomes zero
B) It becomes equal to one resistor
C) It increases to twice the value of one resistor
D) It decreases to half the value of one resistor
Correct Answer: C) It increases to twice the value of one resistor
Rationale: Series resistances add together. Therefore, two equal resistors each having resistance R
produce a total resistance of 2R. Parallel resistance behaves differently, which is why recognizing
circuit configuration is important when calculating current and evaluating fire alarm circuit
characteristics.
, 8. Which measurement is normally expressed in amperes?
A) Resistance
B) Current
C) Voltage
D) Electrical potential
Correct Answer: B) Current
Rationale: The ampere is the unit used to measure electrical current. Voltage is measured in volts,
while resistance is measured in ohms. Current measurements are particularly useful when evaluating
power supplies, notification appliance loads, batteries, and other components of a fire alarm system.
9. Why is polarity important when connecting polarized fire alarm equipment?
A) Reversed polarity can prevent equipment from operating correctly
B) Polarity determines the building's occupancy classification
C) Polarity eliminates the need for supervision
D) Reversed polarity always increases available voltage
Correct Answer: A) Reversed polarity can prevent equipment from operating correctly
Rationale: Polarized equipment is designed to operate with its terminals connected in the proper
electrical orientation. Reversing polarity can cause improper operation or prevent operation
altogether. Installers should follow the equipment manufacturer's wiring instructions and verify
polarity during installation and testing.
10. A power supply delivers 24 volts at 2 amperes. What is the approximate power output?
A) 12 W
B) 24 W
C) 26 W
D) 48 W
Correct Answer: D) 48 W
Rationale: Electrical power can be calculated as P = E × I. Therefore, 24 volts multiplied by 2 amperes
equals 48 watts. Basic power calculations help determine whether a power supply can adequately
support connected equipment and whether a system design remains within its electrical capacity.
II. Requirements for Electrical Installation — Questions 11–15
11. Which NFPA publication is the National Electrical Code?
A) NFPA 13
B) NFPA 70
C) NFPA 72
D) NFPA 101
Correct Answer: B) NFPA 70
EXAM PRACTICE QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALE 2026 Q&A | INSTANT
DOWNLOAD PDF
I. General Knowledge and Theory — Questions 1–10
1. What is the primary purpose of a fire alarm control unit in a fire alarm system?
A) To receive system inputs, process them, and control appropriate outputs
B) To supply normal building lighting
C) To replace all emergency power sources
D) To provide mechanical ventilation only
Correct Answer: A) To receive system inputs, process them, and control appropriate outputs
Rationale: The fire alarm control unit is the central processing component of a fire alarm system. It
receives signals from initiating devices and supervises system conditions, then operates notification
or other controlled outputs as required. It does not replace building electrical distribution, emergency
generators, or mechanical systems.
2. Which condition most directly represents an open circuit in a supervised fire alarm initiating
circuit?
A) A normal alarm condition
B) A loss of circuit continuity
C) An increase in speaker volume
D) A short-term increase in battery capacity
Correct Answer: B) A loss of circuit continuity
Rationale: An open circuit interrupts electrical continuity and, when the circuit is supervised, normally
produces a trouble indication. Supervision allows the control unit to detect wiring faults rather than
silently losing protection. An alarm signal and a trouble signal represent different system conditions.
3. What is the principal electrical relationship expressed by Ohm's law?
A) Power equals voltage divided by resistance
B) Resistance equals current multiplied by voltage
C) Current equals voltage divided by resistance
D) Voltage equals resistance divided by current
Correct Answer: C) Current equals voltage divided by resistance
Rationale: Ohm's law is expressed as I = E/R, where current equals voltage divided by resistance. This
relationship is useful when evaluating circuit loading, voltage drop, and electrical characteristics.
Understanding the relationship helps a fire alarm professional evaluate whether a circuit can operate
properly under expected conditions.
4. A 24-volt circuit has a resistance of 120 ohms. Approximately how much current flows?
,A) 0.02 A
B) 0.20 A
C) 2.0 A
D) 5.0 A
Correct Answer: B) 0.20 A
Rationale: Applying Ohm's law gives I = E/R = 24/120 = 0.20 amperes. The result is substantially less
than one ampere. Being able to perform basic electrical calculations is important when evaluating
circuit loading and determining whether connected equipment remains within its rated operating
parameters.
5. Which statement best describes voltage?
A) The opposition to current flow
B) The rate at which electrical energy is consumed
C) The quantity of electrons stored in a conductor
D) The electrical potential difference that drives current
Correct Answer: D) The electrical potential difference that drives current
Rationale: Voltage represents electrical potential difference and provides the force that can drive
current through a circuit. Resistance opposes current, while power describes the rate of electrical
energy transfer. Distinguishing these fundamental quantities is necessary for troubleshooting and
calculating fire alarm circuit performance.
6. What is the primary function of a fuse or circuit breaker?
A) Protect conductors and equipment against excessive current
B) Increase available circuit voltage
C) Provide alarm notification automatically
D) Supervise every initiating device individually
Correct Answer: A) Protect conductors and equipment against excessive current
Rationale: Overcurrent protective devices interrupt a circuit when current becomes excessive under
specified conditions. Their purpose is protection rather than system supervision or alarm notification.
Proper overcurrent protection helps limit damage to conductors and connected equipment resulting
from abnormal electrical conditions.
7. What happens to total resistance when two resistors of equal value are connected in series?
A) It becomes zero
B) It becomes equal to one resistor
C) It increases to twice the value of one resistor
D) It decreases to half the value of one resistor
Correct Answer: C) It increases to twice the value of one resistor
Rationale: Series resistances add together. Therefore, two equal resistors each having resistance R
produce a total resistance of 2R. Parallel resistance behaves differently, which is why recognizing
circuit configuration is important when calculating current and evaluating fire alarm circuit
characteristics.
, 8. Which measurement is normally expressed in amperes?
A) Resistance
B) Current
C) Voltage
D) Electrical potential
Correct Answer: B) Current
Rationale: The ampere is the unit used to measure electrical current. Voltage is measured in volts,
while resistance is measured in ohms. Current measurements are particularly useful when evaluating
power supplies, notification appliance loads, batteries, and other components of a fire alarm system.
9. Why is polarity important when connecting polarized fire alarm equipment?
A) Reversed polarity can prevent equipment from operating correctly
B) Polarity determines the building's occupancy classification
C) Polarity eliminates the need for supervision
D) Reversed polarity always increases available voltage
Correct Answer: A) Reversed polarity can prevent equipment from operating correctly
Rationale: Polarized equipment is designed to operate with its terminals connected in the proper
electrical orientation. Reversing polarity can cause improper operation or prevent operation
altogether. Installers should follow the equipment manufacturer's wiring instructions and verify
polarity during installation and testing.
10. A power supply delivers 24 volts at 2 amperes. What is the approximate power output?
A) 12 W
B) 24 W
C) 26 W
D) 48 W
Correct Answer: D) 48 W
Rationale: Electrical power can be calculated as P = E × I. Therefore, 24 volts multiplied by 2 amperes
equals 48 watts. Basic power calculations help determine whether a power supply can adequately
support connected equipment and whether a system design remains within its electrical capacity.
II. Requirements for Electrical Installation — Questions 11–15
11. Which NFPA publication is the National Electrical Code?
A) NFPA 13
B) NFPA 70
C) NFPA 72
D) NFPA 101
Correct Answer: B) NFPA 70
