1. Which NEC article primarily governs communication circuits?
A. Article 725
B. Article 760
C. Article 770
D. Article 800
ANSWER : D
Explanation: NEC Article 800 covers communications circuits such as
telephone, data, and broadband systems.
2. What voltage level are most communication systems designed to operate
at?
A. Above 600 volts
B. 120/240 volts
C. Below 50 volts
D. Between 120 and 277 volts
ANSWER : C
Explanation: Communication systems are low-voltage systems, typically
operating below 50 volts to reduce shock and fire hazards.
3. Which type of cable is most commonly used for Ethernet networks?
A. Coaxial cable
B. Fiber optic cable
C. Twisted-pair cable
D. NM-B cable
,ANSWER : C
Explanation: Twisted-pair cables (such as Cat 5e, Cat 6) are standard for
Ethernet networking.
4. What is the maximum allowable length of a standard Ethernet cable
run?
A. 50 meters
B. 75 meters
C. 100 meters
D. 150 meters
ANSWER : C
Explanation: Ethernet standards limit cable runs to 100 meters (328 feet) for
proper signal integrity.
5. Which tool is commonly used to terminate twisted-pair network cables?
A. Voltage tester
B. Crimping tool
C. Fish tape
D. Torque wrench
ANSWER : B
Explanation: A crimping tool is used to attach RJ-45 connectors to twisted-pair
cables.
6. What does “plenum-rated” cable mean?
A. It is waterproof
B. It is shielded
C. It can be installed in air-handling spaces
D. It is outdoor-rated
ANSWER : C
Explanation: Plenum-rated cables produce less smoke and toxic fumes and are
approved for air plenums.
7. Which NEC article covers fire alarm systems?
,A. Article 725
B. Article 760
C. Article 800
D. Article 820
ANSWER : B
Explanation: NEC Article 760 governs fire alarm systems and wiring methods.
8. What is the primary advantage of fiber optic cable?
A. Lower cost
B. Easier termination
C. Immunity to electromagnetic interference
D. Higher voltage capacity
ANSWER : C
Explanation: Fiber optic cables are immune to EMI and provide high-speed
data transmission.
9. What device converts optical signals to electrical signals?
A. Modem
B. Router
C. Media converter
D. Switch
ANSWER : C
Explanation: Media converters change optical signals into electrical signals
and vice versa.
10. Which color is typically used to identify grounding conductors?
A. Blue
B. White
C. Green
D. Red
ANSWER : C
Explanation: Green or green/yellow conductors identify grounding conductors
per NEC standards.
, 11. What is the purpose of bonding in communication systems?
A. Increase voltage
B. Improve signal quality
C. Reduce shock hazards
D. Prevent corrosion
ANSWER : C
Explanation: Bonding ensures all metallic parts are at the same electrical
potential to reduce shock risk.
12. Which cable type is commonly used for cable television systems?
A. Cat 6
B. Coaxial cable
C. Fiber optic cable
D. THHN
ANSWER : B
Explanation: Coaxial cable is standard for cable TV and broadband services.
13. What does “twisted pair” cable reduce?
A. Voltage drop
B. Heat buildup
C. Electromagnetic interference
D. Cable weight
ANSWER : C
Explanation: Twisting the conductors helps cancel out electromagnetic
interference.
14. What is the main function of a patch panel?
A. Power distribution
B. Cable splicing
C. Cable termination and organization
D. Signal amplification
A. Article 725
B. Article 760
C. Article 770
D. Article 800
ANSWER : D
Explanation: NEC Article 800 covers communications circuits such as
telephone, data, and broadband systems.
2. What voltage level are most communication systems designed to operate
at?
A. Above 600 volts
B. 120/240 volts
C. Below 50 volts
D. Between 120 and 277 volts
ANSWER : C
Explanation: Communication systems are low-voltage systems, typically
operating below 50 volts to reduce shock and fire hazards.
3. Which type of cable is most commonly used for Ethernet networks?
A. Coaxial cable
B. Fiber optic cable
C. Twisted-pair cable
D. NM-B cable
,ANSWER : C
Explanation: Twisted-pair cables (such as Cat 5e, Cat 6) are standard for
Ethernet networking.
4. What is the maximum allowable length of a standard Ethernet cable
run?
A. 50 meters
B. 75 meters
C. 100 meters
D. 150 meters
ANSWER : C
Explanation: Ethernet standards limit cable runs to 100 meters (328 feet) for
proper signal integrity.
5. Which tool is commonly used to terminate twisted-pair network cables?
A. Voltage tester
B. Crimping tool
C. Fish tape
D. Torque wrench
ANSWER : B
Explanation: A crimping tool is used to attach RJ-45 connectors to twisted-pair
cables.
6. What does “plenum-rated” cable mean?
A. It is waterproof
B. It is shielded
C. It can be installed in air-handling spaces
D. It is outdoor-rated
ANSWER : C
Explanation: Plenum-rated cables produce less smoke and toxic fumes and are
approved for air plenums.
7. Which NEC article covers fire alarm systems?
,A. Article 725
B. Article 760
C. Article 800
D. Article 820
ANSWER : B
Explanation: NEC Article 760 governs fire alarm systems and wiring methods.
8. What is the primary advantage of fiber optic cable?
A. Lower cost
B. Easier termination
C. Immunity to electromagnetic interference
D. Higher voltage capacity
ANSWER : C
Explanation: Fiber optic cables are immune to EMI and provide high-speed
data transmission.
9. What device converts optical signals to electrical signals?
A. Modem
B. Router
C. Media converter
D. Switch
ANSWER : C
Explanation: Media converters change optical signals into electrical signals
and vice versa.
10. Which color is typically used to identify grounding conductors?
A. Blue
B. White
C. Green
D. Red
ANSWER : C
Explanation: Green or green/yellow conductors identify grounding conductors
per NEC standards.
, 11. What is the purpose of bonding in communication systems?
A. Increase voltage
B. Improve signal quality
C. Reduce shock hazards
D. Prevent corrosion
ANSWER : C
Explanation: Bonding ensures all metallic parts are at the same electrical
potential to reduce shock risk.
12. Which cable type is commonly used for cable television systems?
A. Cat 6
B. Coaxial cable
C. Fiber optic cable
D. THHN
ANSWER : B
Explanation: Coaxial cable is standard for cable TV and broadband services.
13. What does “twisted pair” cable reduce?
A. Voltage drop
B. Heat buildup
C. Electromagnetic interference
D. Cable weight
ANSWER : C
Explanation: Twisting the conductors helps cancel out electromagnetic
interference.
14. What is the main function of a patch panel?
A. Power distribution
B. Cable splicing
C. Cable termination and organization
D. Signal amplification
