Low Voltage Technician Practice Exam
Questions Correct Answers, and Detailed
Explanations for Computer Science
Students||Already Graded A+
1. What voltage level is typically considered low voltage?
A. Over 600V
B. 120–240V
C. 50V or less
D. 480V
ANSWER: Low-voltage systems are generally defined as
circuits carrying 50 volts or less, which are commonly used in
communications, security, and control systems.
2. Which cable type is most commonly used for Ethernet
networking?
A. RG-6
B. Cat 6
C. THHN
D. Coaxial plenum
ANSWER: Category 6 cable is designed for high-speed
Ethernet networks and supports up to 10 Gbps over short
distances.
, 3. What does PoE stand for?
A. Power on Equipment
B. Point of Entry
C. Power over Ethernet
D. Protocol over Ethernet
ANSWER: Power over Ethernet allows both data and
electrical power to be transmitted over a single Ethernet
cable.
4. Which tool is used to terminate RJ45 connectors?
A. Multimeter
B. Punch-down tool
C. Crimping tool
D. Cable stripper
ANSWER: A crimping tool secures RJ45 connectors to
Ethernet cable conductors.
5. What standard governs commercial low-voltage
installations in the U.S.?
A. IEEE
B. OSHA
C. ANSI
D. NEC (NFPA 70)
ANSWER: The National Electrical Code (NEC) sets safety
standards for electrical and low-voltage installations.
, 6. Which color code is used most commonly for Ethernet
wiring?
A. 568A only
B. 568B
C. TIA-606
D. IEEE 802.3
ANSWER: T568B is the most commonly used wiring standard
for Ethernet cabling in the U.S.
7. What device amplifies and regenerates network signals?
A. Router
B. Switch
C. Repeater
D. Modem
ANSWER: Repeaters regenerate signals to extend
transmission distance.
8. Which type of connector is used with coaxial cable?
A. RJ45
B. SC
C. BNC
D. LC
ANSWER: BNC connectors are commonly used with coaxial
cables for CCTV and radio frequency systems.
, 9. What is the purpose of a punch-down block?
A. Testing voltage
B. Splicing fiber
C. Terminating twisted-pair cables
D. Measuring resistance
ANSWER: Punch-down blocks provide a secure termination
point for twisted-pair cabling.
10. What does CCTV stand for?
A. Central Control Television
B. Closed-Circuit Television
C. Camera Circuit Transmission Video
D. Controlled Camera TV
ANSWER: CCTV systems transmit video signals to a limited
set of monitors for security purposes.
11. Which fiber type is used for long-distance
communication?
A. Multimode
B. Single-mode
C. Coaxial
D. Shielded twisted pair
ANSWER: Single-mode fiber supports long-distance, high-
bandwidth communication.
Questions Correct Answers, and Detailed
Explanations for Computer Science
Students||Already Graded A+
1. What voltage level is typically considered low voltage?
A. Over 600V
B. 120–240V
C. 50V or less
D. 480V
ANSWER: Low-voltage systems are generally defined as
circuits carrying 50 volts or less, which are commonly used in
communications, security, and control systems.
2. Which cable type is most commonly used for Ethernet
networking?
A. RG-6
B. Cat 6
C. THHN
D. Coaxial plenum
ANSWER: Category 6 cable is designed for high-speed
Ethernet networks and supports up to 10 Gbps over short
distances.
, 3. What does PoE stand for?
A. Power on Equipment
B. Point of Entry
C. Power over Ethernet
D. Protocol over Ethernet
ANSWER: Power over Ethernet allows both data and
electrical power to be transmitted over a single Ethernet
cable.
4. Which tool is used to terminate RJ45 connectors?
A. Multimeter
B. Punch-down tool
C. Crimping tool
D. Cable stripper
ANSWER: A crimping tool secures RJ45 connectors to
Ethernet cable conductors.
5. What standard governs commercial low-voltage
installations in the U.S.?
A. IEEE
B. OSHA
C. ANSI
D. NEC (NFPA 70)
ANSWER: The National Electrical Code (NEC) sets safety
standards for electrical and low-voltage installations.
, 6. Which color code is used most commonly for Ethernet
wiring?
A. 568A only
B. 568B
C. TIA-606
D. IEEE 802.3
ANSWER: T568B is the most commonly used wiring standard
for Ethernet cabling in the U.S.
7. What device amplifies and regenerates network signals?
A. Router
B. Switch
C. Repeater
D. Modem
ANSWER: Repeaters regenerate signals to extend
transmission distance.
8. Which type of connector is used with coaxial cable?
A. RJ45
B. SC
C. BNC
D. LC
ANSWER: BNC connectors are commonly used with coaxial
cables for CCTV and radio frequency systems.
, 9. What is the purpose of a punch-down block?
A. Testing voltage
B. Splicing fiber
C. Terminating twisted-pair cables
D. Measuring resistance
ANSWER: Punch-down blocks provide a secure termination
point for twisted-pair cabling.
10. What does CCTV stand for?
A. Central Control Television
B. Closed-Circuit Television
C. Camera Circuit Transmission Video
D. Controlled Camera TV
ANSWER: CCTV systems transmit video signals to a limited
set of monitors for security purposes.
11. Which fiber type is used for long-distance
communication?
A. Multimode
B. Single-mode
C. Coaxial
D. Shielded twisted pair
ANSWER: Single-mode fiber supports long-distance, high-
bandwidth communication.
