AZ L-59 Low Voltage Communications
Contractor Exam Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a telecommunications grounding
and bonding system?
a. To increase signal strength
b. To reduce cable length
c. To provide a low-impedance path for fault and surge currents
d. To eliminate all electromagnetic interference
Rationale: A grounding and bonding system provides a low-
impedance path for unwanted electrical current, including fault and
surge currents. Proper bonding also helps establish a common
reference potential and reduces the risk of dangerous voltage
differences.
, 2. Which type of cable is commonly used for Ethernet
communication in structured cabling systems?
a. RG-6 coaxial cable
b. Category 6 twisted-pair cable
c. THHN conductor
d. Type NM cable
Rationale: Category 6 twisted-pair cable is widely used for Ethernet
networks. Its twisted conductors help reduce electromagnetic
interference and support high-speed data transmission.
3. What is the main function of twisting the conductors in a
balanced communications cable?
a. Increase conductor diameter
b. Reduce cable weight
c. Reduce electromagnetic interference and crosstalk
d. Increase operating voltage
Rationale: Twisting helps each conductor experience similar
electromagnetic interference, allowing much of the interference to
cancel at the receiver. It also reduces coupling between adjacent
pairs.
, 4. Which device is typically used to terminate individual twisted-pair
conductors in a patch panel?
a. Circuit breaker
b. Fuse holder
c. IDC termination
d. Transformer
Rationale: Insulation-displacement connectors (IDCs) allow twisted-
pair conductors to be terminated without stripping insulation in the
traditional manner. They are common in patch panels and
telecommunications hardware.
5. What does UTP stand for?
a. Universal Transmission Port
b. Underground Telephone Pair
c. Unshielded Twisted Pair
d. Unified Terminal Protection
Rationale: UTP stands for Unshielded Twisted Pair. The cable consists
of insulated copper conductors twisted into pairs without an overall
metallic shield.
6. What is the purpose of a patch panel in a structured cabling
system?
, a. Convert AC power to DC power
b. Increase network voltage
c. Provide an organized termination and cross-connection point for
cables
d. Replace all network switches
Rationale: Patch panels provide an organized location where
permanent horizontal or backbone cables can be terminated and then
connected to network equipment using patch cords.
7. Which connector is commonly associated with Ethernet twisted-
pair patch cables?
a. BNC
b. F-type
c. 8P8C modular connector commonly called RJ-45
d. N-type
Rationale: Ethernet patch cables using twisted-pair copper normally
use an 8P8C modular connector, commonly referred to as an RJ-45
connector. The connector accommodates the eight conductors in four
twisted pairs.
8. What is the purpose of a cable tester for structured cabling?
Contractor Exam Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a telecommunications grounding
and bonding system?
a. To increase signal strength
b. To reduce cable length
c. To provide a low-impedance path for fault and surge currents
d. To eliminate all electromagnetic interference
Rationale: A grounding and bonding system provides a low-
impedance path for unwanted electrical current, including fault and
surge currents. Proper bonding also helps establish a common
reference potential and reduces the risk of dangerous voltage
differences.
, 2. Which type of cable is commonly used for Ethernet
communication in structured cabling systems?
a. RG-6 coaxial cable
b. Category 6 twisted-pair cable
c. THHN conductor
d. Type NM cable
Rationale: Category 6 twisted-pair cable is widely used for Ethernet
networks. Its twisted conductors help reduce electromagnetic
interference and support high-speed data transmission.
3. What is the main function of twisting the conductors in a
balanced communications cable?
a. Increase conductor diameter
b. Reduce cable weight
c. Reduce electromagnetic interference and crosstalk
d. Increase operating voltage
Rationale: Twisting helps each conductor experience similar
electromagnetic interference, allowing much of the interference to
cancel at the receiver. It also reduces coupling between adjacent
pairs.
, 4. Which device is typically used to terminate individual twisted-pair
conductors in a patch panel?
a. Circuit breaker
b. Fuse holder
c. IDC termination
d. Transformer
Rationale: Insulation-displacement connectors (IDCs) allow twisted-
pair conductors to be terminated without stripping insulation in the
traditional manner. They are common in patch panels and
telecommunications hardware.
5. What does UTP stand for?
a. Universal Transmission Port
b. Underground Telephone Pair
c. Unshielded Twisted Pair
d. Unified Terminal Protection
Rationale: UTP stands for Unshielded Twisted Pair. The cable consists
of insulated copper conductors twisted into pairs without an overall
metallic shield.
6. What is the purpose of a patch panel in a structured cabling
system?
, a. Convert AC power to DC power
b. Increase network voltage
c. Provide an organized termination and cross-connection point for
cables
d. Replace all network switches
Rationale: Patch panels provide an organized location where
permanent horizontal or backbone cables can be terminated and then
connected to network equipment using patch cords.
7. Which connector is commonly associated with Ethernet twisted-
pair patch cables?
a. BNC
b. F-type
c. 8P8C modular connector commonly called RJ-45
d. N-type
Rationale: Ethernet patch cables using twisted-pair copper normally
use an 8P8C modular connector, commonly referred to as an RJ-45
connector. The connector accommodates the eight conductors in four
twisted pairs.
8. What is the purpose of a cable tester for structured cabling?
