RCDD 12th Edition Chapter 1 Exam Questions and Answers Fully Solved Latest Version 2025-2026
Elementry knowledge of transmission = - Answers Electronics, electrical concepts, volts, AMP's and
ohm's.
An electrical conductor is = - Answers Any material that can carry a electric charge from one point to
another.
Common conductors are = - Answers Copper, Copper-covered steel, High strength alloys, Aluminum.
Silver and gold are good conductors BUT = - Answers Cost too much.
Annealed copper = - Answers 100%
Alloying = - Answers Adverse effect
corrosion resistance = - Answers High-strength alloys = poor
Oxidation resistance = - Answers Aluminum = poor
Advantages of solid conductors = - Answers - Less costly -[less complex termination systems]
- Better transmission performance at high frequencies.
Advantages of stranded conductors = - Answers - More flexible -[Longer flex life]
- Less susceptible to damage during crimp termination process.
Not advantage of stranded = - Answers Better transmission
AWG = - Answers Accepted in North America
AWG in power distribution = - Answers World wide
Insulation/dielectric used to isolate current by preventing direct contact between = - Answers -
Conductors
- A conductor and its environment
Lower dielectric constant and dissipation factor = - Answers Have better transmission performance
including lower attenuation characteristics and lower capacitance
PVC = - Answers Indoor
PE = - Answers Outdoor
Teflon = - Answers Du Pont
FEP = - Answers Fluorinated ethylene propylene
, FEP Dielectric constant = - Answers 2.1
FEP Dissipation Factor = - Answers 0.0005
Dielectric strength = - Answers Measures maximum voltage
Dissipation factor = - Answers The relative power loss in the insulation due to molecular excitement and
subsequent kinetic and thermal energy loss
Insulation resistance (IR) = - Answers The insulation's ability to resist the flow of current through it.
Insulation resistance (IR) = - Answers For inside conductors, IR is typically expressed in mega ohm-
Kilometer(Km) or mega ohm 1000(ft)
Twisted pair = - Answers Minimizes cross talk
Pair to pair capacitance = - Answers Electric field
Mutual field = - Answers Magnetic field coupling
Twisted pair = - Answers Counter clockwise
Voice twist = - Answers 2-6(inch)
Data twist = - Answers .50(inch) Cat5e & 6
Copper temperature = - Answers 68F
Shields = - Answers Many types
Best possible shield = - Answers Conduits
Foil Shield = - Answers Excellent rating
Shield effectiveness ratings = - Answers - Poor means less than 20 [dB]
- Fair means 20 to 40 dB
- Good means 40 to 60 dB
- Excellent means more than 60 dB
Braid/Magnetic field = - Answers Poor rating
Shielded not grounded = - Answers effectiveness reduced
A drain wire running the length of the cable next to shield = - Answers Provides ample grounding
(earthing).
Drain wires are used = - Answers - With foil, non metallic, and hybrid shields
Elementry knowledge of transmission = - Answers Electronics, electrical concepts, volts, AMP's and
ohm's.
An electrical conductor is = - Answers Any material that can carry a electric charge from one point to
another.
Common conductors are = - Answers Copper, Copper-covered steel, High strength alloys, Aluminum.
Silver and gold are good conductors BUT = - Answers Cost too much.
Annealed copper = - Answers 100%
Alloying = - Answers Adverse effect
corrosion resistance = - Answers High-strength alloys = poor
Oxidation resistance = - Answers Aluminum = poor
Advantages of solid conductors = - Answers - Less costly -[less complex termination systems]
- Better transmission performance at high frequencies.
Advantages of stranded conductors = - Answers - More flexible -[Longer flex life]
- Less susceptible to damage during crimp termination process.
Not advantage of stranded = - Answers Better transmission
AWG = - Answers Accepted in North America
AWG in power distribution = - Answers World wide
Insulation/dielectric used to isolate current by preventing direct contact between = - Answers -
Conductors
- A conductor and its environment
Lower dielectric constant and dissipation factor = - Answers Have better transmission performance
including lower attenuation characteristics and lower capacitance
PVC = - Answers Indoor
PE = - Answers Outdoor
Teflon = - Answers Du Pont
FEP = - Answers Fluorinated ethylene propylene
, FEP Dielectric constant = - Answers 2.1
FEP Dissipation Factor = - Answers 0.0005
Dielectric strength = - Answers Measures maximum voltage
Dissipation factor = - Answers The relative power loss in the insulation due to molecular excitement and
subsequent kinetic and thermal energy loss
Insulation resistance (IR) = - Answers The insulation's ability to resist the flow of current through it.
Insulation resistance (IR) = - Answers For inside conductors, IR is typically expressed in mega ohm-
Kilometer(Km) or mega ohm 1000(ft)
Twisted pair = - Answers Minimizes cross talk
Pair to pair capacitance = - Answers Electric field
Mutual field = - Answers Magnetic field coupling
Twisted pair = - Answers Counter clockwise
Voice twist = - Answers 2-6(inch)
Data twist = - Answers .50(inch) Cat5e & 6
Copper temperature = - Answers 68F
Shields = - Answers Many types
Best possible shield = - Answers Conduits
Foil Shield = - Answers Excellent rating
Shield effectiveness ratings = - Answers - Poor means less than 20 [dB]
- Fair means 20 to 40 dB
- Good means 40 to 60 dB
- Excellent means more than 60 dB
Braid/Magnetic field = - Answers Poor rating
Shielded not grounded = - Answers effectiveness reduced
A drain wire running the length of the cable next to shield = - Answers Provides ample grounding
(earthing).
Drain wires are used = - Answers - With foil, non metallic, and hybrid shields
