Question 1

_____________is a measure of the difference in time between the fastest and the slowest wire pair in a UTP cable.

Accepted Answer

A) Attenuation 
B) Reflection 
C) Return loss 
D) Delay skew 
A) Attenuation 
B) Reflection 
C) Return loss 
D) Delay skew D

Question 2

What substance is commonly used as the dielectric in transmission lines?

Accepted Answer

A) Teflon 
B) Pyrex 
C) Rubber 
D) Copper 
A) Teflon 
B) Pyrex 
C) Rubber 
D) Copper A

Question 3

What is one the most useful properties of the Smith chart?

Accepted Answer

A) Its ability to solve impedance-matching problems. 
B) It is an easy measure indication of the severity of mismatch. 
C) It exhibits properties of inductance and capacitance. 
D) It can determine the effects on impedance of changes to component values. 
A) Its ability to solve impedance-matching problems. 
B) It is an easy measure indication of the severity of mismatch. 
C) It exhibits properties of inductance and capacitance. 
D) It can determine the effects on impedance of changes to component values. A

Question 4

What type of cable must not be stepped on,crimped,or bent in too small a radius?

Accepted Answer

A) Coaxial 
B) Flexible 
C) Electrical 
D) Solid dielectric 
A) Coaxial 
B) Flexible 
C) Electrical 
D) Solid dielectric

Question 5

What does power-sum testing measure?

Accepted Answer

A) Total crosstalk of all cable pairs 
B) Diameter of copper, cable handling, and dielectric differences 
C) Signal reflection results from impedance changes 
D) Any noise or unwanted signal picked up by the balanced line 
A) Total crosstalk of all cable pairs 
B) Diameter of copper, cable handling, and dielectric differences 
C) Signal reflection results from impedance changes 
D) Any noise or unwanted signal picked up by the balanced line

Question 6

A ______________ terminated in an open has a reflected voltage wave that is always of the same polarity and amplitude as the incident voltage wave.

Accepted Answer

A) transmission line 
B) magnetic field 
C) wavelength 
D) circuit 
A) transmission line 
B) magnetic field 
C) wavelength 
D) circuit

Question 7

____________ are hollow tubes used to conduct electromagnetic energy at microwave frequencies.

Accepted Answer

A) Antennas 
B) Transmission lines 
C) Cables 
D) Waveguides 
A) Antennas 
B) Transmission lines 
C) Cables 
D) Waveguides

Question 8

What is the ratio of reflected voltage to incident voltages called?

Accepted Answer

A) Voltage standing-wave ratio 
B) Reflection coefficient 
C) Return loss 
D) Standing wave 
A) Voltage standing-wave ratio 
B) Reflection coefficient 
C) Return loss 
D) Standing wave

Question 9

Which of the following would measure of the level of crosstalk,or signal coupling,within a cable?

Accepted Answer

A) Delay skew 
B) Near-end crosstalk (NEXT) 
C) Standing wave ratio (SWR) 
D) Voltage standing wave ratio (VSWR) 
A) Delay skew 
B) Near-end crosstalk (NEXT) 
C) Standing wave ratio (SWR) 
D) Voltage standing wave ratio (VSWR)

Question 10

What speed does a wave that is radiated through "free space" travel?

Accepted Answer

A) Speed of light 
B) Speed of sound 
C) Actual velocity 
D) Velocity of propagation 
A) Speed of light 
B) Speed of sound 
C) Actual velocity 
D) Velocity of propagation

Question 11

A very common problem with transmission line communications involves what type of failure between communications terminals?

Accepted Answer

A) Capacitor 
B) Antenna 
C) Cable 
D) Voltage 
A) Capacitor 
B) Antenna 
C) Cable 
D) Voltage

Question 12

What is the principal advantage of the shielded pair?

Accepted Answer

A) Inexpensive to construct 
B) Measures difference in time between fastest and slowest wire pair 
C) Transmit-signal levels strong 
D) Conductors balanced to ground 
A) Inexpensive to construct 
B) Measures difference in time between fastest and slowest wire pair 
C) Transmit-signal levels strong 
D) Conductors balanced to ground

Question 13

What substance allows the construction of a flexible cable whose dielectric losses,though higher than air,are still much lower than the losses that occur with other types of low-cost dielectrics?

Accepted Answer

A) Rubber 
B) Polyethylene 
C) Teflon 
D) Pyrex 
A) Rubber 
B) Polyethylene 
C) Teflon 
D) Pyrex

Question 14

When current travels in a wire,what is created?

Accepted Answer

A) High frequencies 
B) Electromagnetic field 
C) Crosstalk 
D) Increase in signal-transmission performance 
A) High frequencies 
B) Electromagnetic field 
C) Crosstalk 
D) Increase in signal-transmission performance

Question 15

The resistance of any conductor is never zero _________.

Accepted Answer

A) ohms 
B) voltage 
C) current 
D) impedance 
A) ohms 
B) voltage 
C) current 
D) impedance

Question 16

The problem of radiation loss is of consequence for only what type of transmission lines?

Accepted Answer

A) Unshielded twisted-pair 
B) Twisted pair 
C) Parallel-wire 
D) Shielded pair 
A) Unshielded twisted-pair 
B) Twisted pair 
C) Parallel-wire 
D) Shielded pair

Question 17

A _________ is a transmission line that is terminated with an impedance that is not equal to its characteristic impedance.

Accepted Answer

A) nonresonant line 
B) line wavelength 
C) terminated line 
D) resonant line 
A) nonresonant line 
B) line wavelength 
C) terminated line 
D) resonant line

Question 18

A ___________ is created as the result of the instantaneous vector addition of the incident-wave amplitude with that of the reflected wave created as the result of impedance mismatch between the transmission line and the load.

Accepted Answer

A) flat line 
B) wavelength 
C) traveling wave 
D) standing wave 
A) flat line 
B) wavelength 
C) traveling wave 
D) standing wave

Question 19

What is one of the simplest and yet most useful measuring instruments at very high frequencies?

Accepted Answer

A) Time-domain reflectometry 
B) Slotted line 
C) Double-stub tuner 
D) Balun 
A) Time-domain reflectometry 
B) Slotted line 
C) Double-stub tuner 
D) Balun

Question 20

The shielded pair consists of parallel conductors separated from each other,and surrounded by a solid dielectric. Which of the following materials acts as the shield?

Accepted Answer

A) Copper braid tubing 
B) Polystyrene 
C) Insulating spacers 
D) Inert gases 
A) Copper braid tubing 
B) Polystyrene 
C) Insulating spacers 
D) Inert gases

_____________is a measure of the difference in time between the fastest and the slowest wire pair in a UTP cable.

What substance is commonly used as the dielectric in transmission lines?

What is one the most useful properties of the Smith chart?

What type of cable must not be stepped on,crimped,or bent in too small a radius?

What does power-sum testing measure?

A ______________ terminated in an open has a reflected voltage wave that is always of the same polarity and amplitude as the incident voltage wave.

____________ are hollow tubes used to conduct electromagnetic energy at microwave frequencies.

What is the ratio of reflected voltage to incident voltages called?

Which of the following would measure of the level of crosstalk,or signal coupling,within a cable?

What speed does a wave that is radiated through "free space" travel?

A very common problem with transmission line communications involves what type of failure between communications terminals?

What is the principal advantage of the shielded pair?

What substance allows the construction of a flexible cable whose dielectric losses,though higher than air,are still much lower than the losses that occur with other types of low-cost dielectrics?

When current travels in a wire,what is created?

The resistance of any conductor is never zero _________.

The problem of radiation loss is of consequence for only what type of transmission lines?

A _________ is a transmission line that is terminated with an impedance that is not equal to its characteristic impedance.

A ___________ is created as the result of the instantaneous vector addition of the incident-wave amplitude with that of the reflected wave created as the result of impedance mismatch between the transmission line and the load.

What is one of the simplest and yet most useful measuring instruments at very high frequencies?

The shielded pair consists of parallel conductors separated from each other,and surrounded by a solid dielectric. Which of the following materials acts as the shield?

Fundamental Communications Concept

Amplitude Modulation

Angle Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters

Exam 12: Transmission Lines

_____________is a measure of the difference in time between the fastest and the slowest wire pair in a UTP cable.

What substance is commonly used as the dielectric in transmission lines?

What is one the most useful properties of the Smith chart?

What type of cable must not be stepped on,crimped,or bent in too small a radius?

What does power-sum testing measure?

A ______________ terminated in an open has a reflected voltage wave that is always of the same polarity and amplitude as the incident voltage wave.

____________ are hollow tubes used to conduct electromagnetic energy at microwave frequencies.

What is the ratio of reflected voltage to incident voltages called?

Which of the following would measure of the level of crosstalk,or signal coupling,within a cable?

What speed does a wave that is radiated through "free space" travel?

A very common problem with transmission line communications involves what type of failure between communications terminals?

What is the principal advantage of the shielded pair?

What substance allows the construction of a flexible cable whose dielectric losses,though higher than air,are still much lower than the losses that occur with other types of low-cost dielectrics?

When current travels in a wire,what is created?

The resistance of any conductor is never zero _________.

The problem of radiation loss is of consequence for only what type of transmission lines?

A _________ is a transmission line that is terminated with an impedance that is not equal to its characteristic impedance.

A ___________ is created as the result of the instantaneous vector addition of the incident-wave amplitude with that of the reflected wave created as the result of impedance mismatch between the transmission line and the load.

What is one of the simplest and yet most useful measuring instruments at very high frequencies?

The shielded pair consists of parallel conductors separated from each other,and surrounded by a solid dielectric. Which of the following materials acts as the shield?

Fundamental Communications Concept

Amplitude Modulation

Angle Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters