NEW JERSEY BURGLAR ALARM CONTRACTOR
PRACTICE EXAM Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf.
1. Which of the following best describes voltage?
A) The rate of flow of electric charge
B) The force that pushes electric charge through a conductor
C) The opposition to the flow of current
D) The rate at which energy is used
Correct Answer: B
Explanation: Voltage (measured in volts) is the potential difference
or "electrical pressure" that pushes current through a circuit .
2. Ohm's Law states that:
A) Voltage = Current × Resistance
B) Current = Voltage × Resistance
C) Resistance = Current / Voltage
D) Power = Voltage × Current
Correct Answer: A
Explanation: Ohm's Law is the fundamental relationship among
voltage (V), current (I), and resistance (R): V = I × R .
,3. In a simple burglar alarm circuit with a door sensor, the sensor is typically wired
in:
A) A parallel circuit
B) A series circuit
C) A three-phase circuit
D) A multi-branch circuit
Correct Answer: B
Explanation: Most door sensors are placed in series with the zone
circuit and an end-of-line (EOL) resistor. This setup allows the
control panel to detect opens or shorts in that series loop .
4. A burglar alarm circuit is found to have a lower resistance than expected. This is
often referred to as:
A) An open circuit
B) A short circuit
C) A load circuit
D) A high-impedance circuit
Correct Answer: B
Explanation: A short circuit happens when the circuit path has very
little or no resistance, causing excessive current flow. In alarm
terminology, a short can trigger a fault or alarm condition .
5. Which unit of measurement is used to quantify electrical current?
A) Volts (V)
B) Ohms (Ω)
C) Amperes (A)
D) Watts (W)
,Correct Answer: C
Explanation: Current is measured in amperes (amps), representing
the flow rate of electric charge .
6. If a 12 VDC alarm siren draws 0.5 amps, what is the power consumption in
watts?
A) 6 W
B) 12 W
C) 24 W
D) 60 W
Correct Answer: A
*Explanation: Power (P) is calculated by P = V × I. Here, P = 12 V × 0.5 A = 6 W .*
7. In a series circuit, the total resistance is:
A) Less than the smallest resistor
B) The sum of all individual resistors
C) The reciprocal of the sum of reciprocals
D) Always equal to the voltage divided by current
Correct Answer: B
Explanation: In a simple series circuit, the total resistance is the sum
of all individual resistances .
8. If an alarm technician measures resistance in a wire run and obtains an infinite
reading on an ohmmeter, it suggests:
A) A perfect conductor
B) A short circuit
C) A fully charged battery
D) An open circuit
, Correct Answer: D
Explanation: An infinite or very high ohm reading typically indicates
no continuity—an open in the circuit .
9. The total current in a parallel circuit:
A) Is the same through each branch
B) Is divided among the parallel branches
C) Is zero if any branch is open
D) Cannot exceed the smallest resistor's current
Correct Answer: B
Explanation: In parallel circuits, the total current splits among the
branches according to each branch's resistance .
10. Which device measures electrical voltage?
A) Ohmmeter
B) Voltmeter
C) Ammeter
D) Wattmeter
Correct Answer: B
Explanation: A voltmeter is used to measure the potential difference
(voltage) across two points in a circuit .
Section 2: Alarm System Components & Operation
11. What is the primary purpose of a burglar alarm system?
A) To prevent fire damage
B) To detect unauthorized entry and alert occupants or authorities
PRACTICE EXAM Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf.
1. Which of the following best describes voltage?
A) The rate of flow of electric charge
B) The force that pushes electric charge through a conductor
C) The opposition to the flow of current
D) The rate at which energy is used
Correct Answer: B
Explanation: Voltage (measured in volts) is the potential difference
or "electrical pressure" that pushes current through a circuit .
2. Ohm's Law states that:
A) Voltage = Current × Resistance
B) Current = Voltage × Resistance
C) Resistance = Current / Voltage
D) Power = Voltage × Current
Correct Answer: A
Explanation: Ohm's Law is the fundamental relationship among
voltage (V), current (I), and resistance (R): V = I × R .
,3. In a simple burglar alarm circuit with a door sensor, the sensor is typically wired
in:
A) A parallel circuit
B) A series circuit
C) A three-phase circuit
D) A multi-branch circuit
Correct Answer: B
Explanation: Most door sensors are placed in series with the zone
circuit and an end-of-line (EOL) resistor. This setup allows the
control panel to detect opens or shorts in that series loop .
4. A burglar alarm circuit is found to have a lower resistance than expected. This is
often referred to as:
A) An open circuit
B) A short circuit
C) A load circuit
D) A high-impedance circuit
Correct Answer: B
Explanation: A short circuit happens when the circuit path has very
little or no resistance, causing excessive current flow. In alarm
terminology, a short can trigger a fault or alarm condition .
5. Which unit of measurement is used to quantify electrical current?
A) Volts (V)
B) Ohms (Ω)
C) Amperes (A)
D) Watts (W)
,Correct Answer: C
Explanation: Current is measured in amperes (amps), representing
the flow rate of electric charge .
6. If a 12 VDC alarm siren draws 0.5 amps, what is the power consumption in
watts?
A) 6 W
B) 12 W
C) 24 W
D) 60 W
Correct Answer: A
*Explanation: Power (P) is calculated by P = V × I. Here, P = 12 V × 0.5 A = 6 W .*
7. In a series circuit, the total resistance is:
A) Less than the smallest resistor
B) The sum of all individual resistors
C) The reciprocal of the sum of reciprocals
D) Always equal to the voltage divided by current
Correct Answer: B
Explanation: In a simple series circuit, the total resistance is the sum
of all individual resistances .
8. If an alarm technician measures resistance in a wire run and obtains an infinite
reading on an ohmmeter, it suggests:
A) A perfect conductor
B) A short circuit
C) A fully charged battery
D) An open circuit
, Correct Answer: D
Explanation: An infinite or very high ohm reading typically indicates
no continuity—an open in the circuit .
9. The total current in a parallel circuit:
A) Is the same through each branch
B) Is divided among the parallel branches
C) Is zero if any branch is open
D) Cannot exceed the smallest resistor's current
Correct Answer: B
Explanation: In parallel circuits, the total current splits among the
branches according to each branch's resistance .
10. Which device measures electrical voltage?
A) Ohmmeter
B) Voltmeter
C) Ammeter
D) Wattmeter
Correct Answer: B
Explanation: A voltmeter is used to measure the potential difference
(voltage) across two points in a circuit .
Section 2: Alarm System Components & Operation
11. What is the primary purpose of a burglar alarm system?
A) To prevent fire damage
B) To detect unauthorized entry and alert occupants or authorities
