CHAPTER 1 Principles of Transmission
Exam 2025 Questions and Answers
What is an electrical conductor? - ANSWER✔✔-Any material that can carry current
from one point to another.
What are 4 common electrical conductors used to make wire and cable? - ANSWER✔✔-
1. Copper
2. Copper covered steel
3. High Strength copper alloys
4. Aluminum
Why are silver and gold not generally good conductors? - ANSWER✔✔-Because of
their high cost.
Which conductor sets the standard for comparing conductivity? - ANSWER✔✔-Copper
What type of conductor is typically used for aerial, self supporting drop wire? -
ANSWER✔✔-Copper- Covered
,How does the alloying of pure copper affect it's conductivity? - ANSWER✔✔-Adversely
Where are aluminum conductors commonly used? - ANSWER✔✔-Electrical Utility
Distribution Lines
What type of solid conductor has the poorest corrosion resistance? - ANSWER✔✔-High
Strength Alloy
What type of solid conductor has the poorest oxidation resistance? - ANSWER✔✔-
Aluminum
What type of solid conductor has the best tensile strength? - ANSWER✔✔-High
Strength Alloy
How are stranded conductors created? - ANSWER✔✔-By twisting or stranding together
a number of small gauge solid conductors to create a single, larger conductor.
What are 4 advantages of solid conductors? - ANSWER✔✔-1. Less costly
2. Less complex termination systems
3. Better transmission performance at high frequencies
4. Less resistance
What are 3 advantages of stranded conductors? - ANSWER✔✔-1. More flexible
2. Longer flex life
,3. Less susceptible to damage during crimp termination process.
What is a composite conductor? - ANSWER✔✔-A conductor constructed from
nontraditional materials.
What are 5 advantages of composite conductors? - ANSWER✔✔-1. Highly flexible
2. Lightweight
3. Inexpensive
4. Easily embedded
5. Low coefficient of expansion
What are 4 disadvantages of composite conductors? - ANSWER✔✔-1. Poor analog
transmission characteristics including high attenuation, especially above 4000 Hz.
2. Extremely poor digital transmission characteristics
3. Easily damaged unless encased in a rigid material.
4. Inconsistent quality
Are cables with composite conductors recommended for use with modern
telecommunications networks? - ANSWER✔✔-No
, What is the purpose of insulation on a cable? - ANSWER✔✔-To isolate the flow of
current by preventing direct contact between conductors and a conductor and it's
environment.
How do dielectrics reduce EM coupling between conductors? - ANSWER✔✔-By
increasing conductor separation
What is the dielectric constant? - ANSWER✔✔-The ratio of capacitance of an insulated
conductor to the capacitance of the same conductor un insulated in the air.
What does dielectric strength measure? - ANSWER✔✔-The maximum voltage that an
insulation can withstand without breakdown.
What is dissipation factor? - ANSWER✔✔-The relative power loss in the insulation due
to molecular excitement and subsequent kinetic and thermal energy loss.
What is insulation resistance? - ANSWER✔✔-The insulation's ability to resist the flow
of current through it.
What is the main reason for twisting conductor pairs? - ANSWER✔✔-To minimize
crosstalk and noise by decreasing capacitance unbalance and mutual inductance
coupling between pairs.
What is pair to pair capacitance unbalance? - ANSWER✔✔-A measure of the electrical
field coupling between two pairs if a differential voltage is applied on one pair and a
differential noise voltage is measured on another pair in close proximity.
Exam 2025 Questions and Answers
What is an electrical conductor? - ANSWER✔✔-Any material that can carry current
from one point to another.
What are 4 common electrical conductors used to make wire and cable? - ANSWER✔✔-
1. Copper
2. Copper covered steel
3. High Strength copper alloys
4. Aluminum
Why are silver and gold not generally good conductors? - ANSWER✔✔-Because of
their high cost.
Which conductor sets the standard for comparing conductivity? - ANSWER✔✔-Copper
What type of conductor is typically used for aerial, self supporting drop wire? -
ANSWER✔✔-Copper- Covered
,How does the alloying of pure copper affect it's conductivity? - ANSWER✔✔-Adversely
Where are aluminum conductors commonly used? - ANSWER✔✔-Electrical Utility
Distribution Lines
What type of solid conductor has the poorest corrosion resistance? - ANSWER✔✔-High
Strength Alloy
What type of solid conductor has the poorest oxidation resistance? - ANSWER✔✔-
Aluminum
What type of solid conductor has the best tensile strength? - ANSWER✔✔-High
Strength Alloy
How are stranded conductors created? - ANSWER✔✔-By twisting or stranding together
a number of small gauge solid conductors to create a single, larger conductor.
What are 4 advantages of solid conductors? - ANSWER✔✔-1. Less costly
2. Less complex termination systems
3. Better transmission performance at high frequencies
4. Less resistance
What are 3 advantages of stranded conductors? - ANSWER✔✔-1. More flexible
2. Longer flex life
,3. Less susceptible to damage during crimp termination process.
What is a composite conductor? - ANSWER✔✔-A conductor constructed from
nontraditional materials.
What are 5 advantages of composite conductors? - ANSWER✔✔-1. Highly flexible
2. Lightweight
3. Inexpensive
4. Easily embedded
5. Low coefficient of expansion
What are 4 disadvantages of composite conductors? - ANSWER✔✔-1. Poor analog
transmission characteristics including high attenuation, especially above 4000 Hz.
2. Extremely poor digital transmission characteristics
3. Easily damaged unless encased in a rigid material.
4. Inconsistent quality
Are cables with composite conductors recommended for use with modern
telecommunications networks? - ANSWER✔✔-No
, What is the purpose of insulation on a cable? - ANSWER✔✔-To isolate the flow of
current by preventing direct contact between conductors and a conductor and it's
environment.
How do dielectrics reduce EM coupling between conductors? - ANSWER✔✔-By
increasing conductor separation
What is the dielectric constant? - ANSWER✔✔-The ratio of capacitance of an insulated
conductor to the capacitance of the same conductor un insulated in the air.
What does dielectric strength measure? - ANSWER✔✔-The maximum voltage that an
insulation can withstand without breakdown.
What is dissipation factor? - ANSWER✔✔-The relative power loss in the insulation due
to molecular excitement and subsequent kinetic and thermal energy loss.
What is insulation resistance? - ANSWER✔✔-The insulation's ability to resist the flow
of current through it.
What is the main reason for twisting conductor pairs? - ANSWER✔✔-To minimize
crosstalk and noise by decreasing capacitance unbalance and mutual inductance
coupling between pairs.
What is pair to pair capacitance unbalance? - ANSWER✔✔-A measure of the electrical
field coupling between two pairs if a differential voltage is applied on one pair and a
differential noise voltage is measured on another pair in close proximity.
