1. What is the primary function of a punch-down block in a telephone
system?
A. To splice fiber optic cables
B. To provide mechanical support for coaxial cables
C. To terminate twisted-pair wires and connect them to circuits
D. To measure insertion loss
Answer: C. To terminate twisted-pair wires and connect them to circuits
Explanation: Punch-down blocks (66, 110, etc.) are used to neatly terminate
twisted-pair wiring and provide cross-connections for telephone/data systems.
2. Which category of twisted-pair cabling supports 1000 Mbps Ethernet up
to 100 meters?
A. Cat 3
B. Cat 5e
C. Cat 4
D. Cat 2
Answer: B. Cat 5e
Explanation: Category 5e supports Gigabit Ethernet (1000BASE-T) over 100
meters of copper cabling, commonly used in telephone/data networks.
3. What is the main advantage of using fiber optic cable over copper
cabling?
A. Lower equipment cost
B. Immunity to electromagnetic interference (EMI)
C. Easier termination
D. Higher conductor flexibility
Answer: B. Immunity to electromagnetic interference (EMI)
Explanation: Fiber transmits light rather than electrical signals, making it
immune to EMI, with higher bandwidth and longer transmission distances.
,4. A 50-micron multimode fiber core is typically designated as:
A. OM1
B. OM2
C. OM3
D. OS2
Answer: B. OM2
Explanation: OM2 multimode fiber uses a 50 µm core size, commonly used for
short-range data and telephone system backbones.
5. In telecommunications grounding, what is the maximum resistance
allowed to earth ground?
A. 10 ohms
B. 25 ohms
C. 50 ohms
D. 100 ohms
Answer: B. 25 ohms
Explanation: Per NEC and industry standards, a grounding electrode system
should have 25 ohms or less to earth ground.
6. Which connector is most commonly used with coaxial cable in cable TV
and telephone backbone systems?
A. RJ-11
B. RJ-45
C. F-connector
D. SC connector
Answer: C. F-connector
Explanation: The F-type connector is a threaded coaxial connector widely used
for CATV and RF telephone backbone distribution.
7. What is the primary function of a demarcation point (demarc)?
A. Provides power to the telephone system
B. Serves as the boundary between service provider and customer wiring
,C. Increases network speed
D. Houses the main PBX system
Answer: B. Serves as the boundary between service provider and customer
wiring
Explanation: The demarc is the legal and physical hand-off point between the
telephone company’s wiring and the customer’s inside wiring.
8. Which tool is used to identify wiring pairs and test telephone lines by
simulating central office voltage?
A. Tone generator
B. Lineman’s handset (butt set)
C. OTDR
D. Multimeter
Answer: B. Lineman’s handset (butt set)
Explanation: A butt set allows technicians to monitor and test telephone lines
by clipping onto pairs and simulating call functions.
9. What is the maximum distance for a single Ethernet run using twisted-
pair cable (Cat 5e/6)?
A. 50 meters
B. 90 meters plus 10 meters patch cords
C. 200 meters
D. Unlimited with repeaters
Answer: B. 90 meters plus 10 meters patch cords
Explanation: The TIA/EIA standard specifies 90 meters of horizontal cabling
plus 10 meters of patch cords, totaling 100 meters per run.
10. What is the primary purpose of a cross-connect in a telephone wiring
system?
A. To amplify weak signals
B. To provide flexible routing of circuits
C. To convert analog to digital
D. To increase grounding capacity
, Answer: B. To provide flexible routing of circuits
Explanation: Cross-connects (at MDF/IDF) allow technicians to reassign or
reroute circuits without re-running cable.
11. Which of the following is a common cause of crosstalk in twisted-pair
cables?
A. Incorrect punch-down termination
B. Too much grounding resistance
C. High optical loss in connectors
D. Excessive bend radius in fiber
Answer: A. Incorrect punch-down termination
Explanation: Improper termination or untwisting pairs too far introduces
crosstalk between pairs, degrading signal quality.
12. An RJ-11 connector is most often used for:
A. Fiber optic terminations
B. Single-line telephone connections
C. Ethernet networking
D. Coaxial cable connections
Answer: B. Single-line telephone connections
Explanation: RJ-11 is a 6-position modular connector, typically using 2
conductors for telephone service.
13. In fiber optics, what does OTDR stand for?
A. Optical Time Domain Reflectometer
B. Optical Transmission Data Recorder
C. Outside Termination Device Relay
D. Optical Testing Device Reader
Answer: A. Optical Time Domain Reflectometer
Explanation: An OTDR measures fiber length, splice/connector loss, and
locates faults using backscatter.
14. What is the main purpose of plenum-rated cable?
A. To reduce insertion loss
B. To resist moisture in underground ducts
system?
A. To splice fiber optic cables
B. To provide mechanical support for coaxial cables
C. To terminate twisted-pair wires and connect them to circuits
D. To measure insertion loss
Answer: C. To terminate twisted-pair wires and connect them to circuits
Explanation: Punch-down blocks (66, 110, etc.) are used to neatly terminate
twisted-pair wiring and provide cross-connections for telephone/data systems.
2. Which category of twisted-pair cabling supports 1000 Mbps Ethernet up
to 100 meters?
A. Cat 3
B. Cat 5e
C. Cat 4
D. Cat 2
Answer: B. Cat 5e
Explanation: Category 5e supports Gigabit Ethernet (1000BASE-T) over 100
meters of copper cabling, commonly used in telephone/data networks.
3. What is the main advantage of using fiber optic cable over copper
cabling?
A. Lower equipment cost
B. Immunity to electromagnetic interference (EMI)
C. Easier termination
D. Higher conductor flexibility
Answer: B. Immunity to electromagnetic interference (EMI)
Explanation: Fiber transmits light rather than electrical signals, making it
immune to EMI, with higher bandwidth and longer transmission distances.
,4. A 50-micron multimode fiber core is typically designated as:
A. OM1
B. OM2
C. OM3
D. OS2
Answer: B. OM2
Explanation: OM2 multimode fiber uses a 50 µm core size, commonly used for
short-range data and telephone system backbones.
5. In telecommunications grounding, what is the maximum resistance
allowed to earth ground?
A. 10 ohms
B. 25 ohms
C. 50 ohms
D. 100 ohms
Answer: B. 25 ohms
Explanation: Per NEC and industry standards, a grounding electrode system
should have 25 ohms or less to earth ground.
6. Which connector is most commonly used with coaxial cable in cable TV
and telephone backbone systems?
A. RJ-11
B. RJ-45
C. F-connector
D. SC connector
Answer: C. F-connector
Explanation: The F-type connector is a threaded coaxial connector widely used
for CATV and RF telephone backbone distribution.
7. What is the primary function of a demarcation point (demarc)?
A. Provides power to the telephone system
B. Serves as the boundary between service provider and customer wiring
,C. Increases network speed
D. Houses the main PBX system
Answer: B. Serves as the boundary between service provider and customer
wiring
Explanation: The demarc is the legal and physical hand-off point between the
telephone company’s wiring and the customer’s inside wiring.
8. Which tool is used to identify wiring pairs and test telephone lines by
simulating central office voltage?
A. Tone generator
B. Lineman’s handset (butt set)
C. OTDR
D. Multimeter
Answer: B. Lineman’s handset (butt set)
Explanation: A butt set allows technicians to monitor and test telephone lines
by clipping onto pairs and simulating call functions.
9. What is the maximum distance for a single Ethernet run using twisted-
pair cable (Cat 5e/6)?
A. 50 meters
B. 90 meters plus 10 meters patch cords
C. 200 meters
D. Unlimited with repeaters
Answer: B. 90 meters plus 10 meters patch cords
Explanation: The TIA/EIA standard specifies 90 meters of horizontal cabling
plus 10 meters of patch cords, totaling 100 meters per run.
10. What is the primary purpose of a cross-connect in a telephone wiring
system?
A. To amplify weak signals
B. To provide flexible routing of circuits
C. To convert analog to digital
D. To increase grounding capacity
, Answer: B. To provide flexible routing of circuits
Explanation: Cross-connects (at MDF/IDF) allow technicians to reassign or
reroute circuits without re-running cable.
11. Which of the following is a common cause of crosstalk in twisted-pair
cables?
A. Incorrect punch-down termination
B. Too much grounding resistance
C. High optical loss in connectors
D. Excessive bend radius in fiber
Answer: A. Incorrect punch-down termination
Explanation: Improper termination or untwisting pairs too far introduces
crosstalk between pairs, degrading signal quality.
12. An RJ-11 connector is most often used for:
A. Fiber optic terminations
B. Single-line telephone connections
C. Ethernet networking
D. Coaxial cable connections
Answer: B. Single-line telephone connections
Explanation: RJ-11 is a 6-position modular connector, typically using 2
conductors for telephone service.
13. In fiber optics, what does OTDR stand for?
A. Optical Time Domain Reflectometer
B. Optical Transmission Data Recorder
C. Outside Termination Device Relay
D. Optical Testing Device Reader
Answer: A. Optical Time Domain Reflectometer
Explanation: An OTDR measures fiber length, splice/connector loss, and
locates faults using backscatter.
14. What is the main purpose of plenum-rated cable?
A. To reduce insertion loss
B. To resist moisture in underground ducts
