Question 1

The input impedance of a half-wavelength section of 50 ohm transmission line that is terminated with an open is:

Accepted Answer

A)  100 ohms. 
B)  50 ohms. 
C)  0 ohms (a short). 
D)  infinite (open). 
A)  100 ohms. 
B)  50 ohms. 
C)  0 ohms (a short). 
D)  infinite (open). C

Question 2

A transmission line terminated with an open has a reflection coefficient at the load of:

Accepted Answer

A)  0. 
B)  -1. 
C)  +1. 
D)  infinity. 
A)  0. 
B)  -1. 
C)  +1. 
D)  infinity. C

Question 3

A commonly used coaxial cable, RG-58, has a characteristic impedance of 50 ohms. If the spacing between the conductors is doubled, its characteristic impedance will:

Accepted Answer

A)  remain the same. 
B)  decrease. 
C)  increase. 
A)  remain the same. 
B)  decrease. 
C)  increase. C

Question 4

What makes conductors behave differently at high frequencies than they do at low frequencies?

Accepted Answer

A)  At high frequencies, there are many sources of line loss. 
B)  At high frequencies, there are inductive, capacitive, and resistive effects to transmission lines. 
C)  At high frequencies, energy sent down a wire may be reflected back. 
D)  all of the above. 
A)  At high frequencies, there are many sources of line loss. 
B)  At high frequencies, there are inductive, capacitive, and resistive effects to transmission lines. 
C)  At high frequencies, energy sent down a wire may be reflected back. 
D)  all of the above.

Question 5

33. The perimeter of the Smith chart graph represents:

Accepted Answer

A)  the SWR of a transmission line terminated with an open circuit. 
B)  an infinite SWR circle. 
C)  the SWR of a transmission line terminated with a short circuit. 
D)  all of the above 
A)  the SWR of a transmission line terminated with an open circuit. 
B)  an infinite SWR circle. 
C)  the SWR of a transmission line terminated with a short circuit. 
D)  all of the above

Question 6

At resonance, a series RLC circuit will be:

Accepted Answer

A)  capacitive only 
B)  inductive only 
C)  resistive only 
D)  reactive 
E)  none of the above 
A)  capacitive only 
B)  inductive only 
C)  resistive only 
D)  reactive 
E)  none of the above

Question 7

One use of a quarter-wavelength transformer is:

Accepted Answer

A)  match line resistance to load resistance. 
B)  shift voltage. 
C)  step down current. 
D)  all of the above. 
A)  match line resistance to load resistance. 
B)  shift voltage. 
C)  step down current. 
D)  all of the above.

Question 8

The center of the Smith chart represents:

Accepted Answer

A)  a short circuit load impedance. 
B)  a matched load impedance. 
C)  a 1 ohm load impedance. 
D)  an open circuit load impedance. 
A)  a short circuit load impedance. 
B)  a matched load impedance. 
C)  a 1 ohm load impedance. 
D)  an open circuit load impedance.

Question 9

The disadvantage of not having a perfectly matched transmission line in a communication system is:

Accepted Answer

A)  the cable dielectric may break down. 
B)  the existence of reflections increases the power loss. 
C)  noise problems are increased. 
D)  the fully generated power does not reach the load. 
E)  none of the above 
A)  the cable dielectric may break down. 
B)  the existence of reflections increases the power loss. 
C)  noise problems are increased. 
D)  the fully generated power does not reach the load. 
E)  none of the above

Question 10

Which of the following is not an application of a transmission line?

Accepted Answer

A)  filters 
B)  balanced lines 
C)  discrete circuit simulation 
D)  impedance match 
A)  filters 
B)  balanced lines 
C)  discrete circuit simulation 
D)  impedance match

Question 11

A pulse-technique used in determining the location of a fault in a transmission line is called:

Accepted Answer

A)  stub tuning. 
B)  time-domain reflectometry. 
C)  SWR measurements. 
D)  slotted-line measurements. 
A)  stub tuning. 
B)  time-domain reflectometry. 
C)  SWR measurements. 
D)  slotted-line measurements.

Question 12

A non-lossy transmission line terminated with a short circuit will have:

Accepted Answer

A)  an in-phase reflected current that is smaller in magnitude than the incident current. 
B)  an in-phase reflected current that is equal in magnitude to the incident current. 
C)  an opposite-phase reflected current that is equal in magnitude to the incident current. 
D)  an opposite-phase reflected current that is smaller in magnitude than the incident current. 
A)  an in-phase reflected current that is smaller in magnitude than the incident current. 
B)  an in-phase reflected current that is equal in magnitude to the incident current. 
C)  an opposite-phase reflected current that is equal in magnitude to the incident current. 
D)  an opposite-phase reflected current that is smaller in magnitude than the incident current.

Question 13

Which will reduce the radiation loss of transmission line?

Accepted Answer

A)  use better shielding 
B)  terminate the line with a resistive load equal to the transmission line's characteristic impedance 
C)  use coaxial transmission line 
D)  all of the above 
A)  use better shielding 
B)  terminate the line with a resistive load equal to the transmission line's characteristic impedance 
C)  use coaxial transmission line 
D)  all of the above

Question 14

Which of the following can be determined using a slotted line method?

Accepted Answer

A)  generator frequency 
B)  unknown load impedance 
C)  VSWR 
D)  all of the above 
A)  generator frequency 
B)  unknown load impedance 
C)  VSWR 
D)  all of the above

Question 15

A transmission line terminated with an open has a VSWR of:

Accepted Answer

A)  +1. 
B)  0. 
C)  infinity. 
D)  -1. 
A)  +1. 
B)  0. 
C)  infinity. 
D)  -1.

Question 16

Near-end crosstalk is best defined as

Accepted Answer

A)  a desired performance objective 
B)  a measure of the signal coupling outside the cable 
C)  a measure of the level in side the cable 
D)  a measure of the level of crosstalk within a cable 
E)  none of the above 
A)  a desired performance objective 
B)  a measure of the signal coupling outside the cable 
C)  a measure of the level in side the cable 
D)  a measure of the level of crosstalk within a cable 
E)  none of the above

Question 17

A quarter-wavelength transmission line is terminated with a 300 ohm load. Its input impedance is 75 ohms. Its characteristic impedance is:

Accepted Answer

A)  75 ohms. 
B)  150 ohms. 
C)  50 ohms. 
D)  300 ohms. 
E)  187.5 ohms. 
A)  75 ohms. 
B)  150 ohms. 
C)  50 ohms. 
D)  300 ohms. 
E)  187.5 ohms.

Question 18

Moving a full revolution around an SWR circle on the Smith chart represents:

Accepted Answer

A)  moving a half-wavelength down the transmission line. 
B)  moving a quarter-wavelength down the transmission line. 
C)  moving a full wavelength down the transmission line. 
D)  moving two wavelengths down the transmission line. 
A)  moving a half-wavelength down the transmission line. 
B)  moving a quarter-wavelength down the transmission line. 
C)  moving a full wavelength down the transmission line. 
D)  moving two wavelengths down the transmission line.

Question 19

A transmission line that is terminated with a resistive load that is equal to the characteristic impedance of the line is called:

Accepted Answer

A)  reactive 
B)  lossy 
C)  resonant 
D)  nonresonant 
A)  reactive 
B)  lossy 
C)  resonant 
D)  nonresonant

Question 20

Wiring of the RJ-45 connector CAT6 cable is defined by the telecommunications industry standard:

Accepted Answer

A)  ACR 
B)  802.3 
C)  TIA 568B 
D)  802.11 
E)  None of the above 
A)  ACR 
B)  802.3 
C)  TIA 568B 
D)  802.11 
E)  None of the above

The input impedance of a half-wavelength section of 50 ohm transmission line that is terminated with an open is:

A transmission line terminated with an open has a reflection coefficient at the load of:

A commonly used coaxial cable, RG-58, has a characteristic impedance of 50 ohms. If the spacing between the conductors is doubled, its characteristic impedance will:

What makes conductors behave differently at high frequencies than they do at low frequencies?

33. The perimeter of the Smith chart graph represents:

At resonance, a series RLC circuit will be:

One use of a quarter-wavelength transformer is:

The center of the Smith chart represents:

The disadvantage of not having a perfectly matched transmission line in a communication system is:

Which of the following is not an application of a transmission line?

A pulse-technique used in determining the location of a fault in a transmission line is called:

A non-lossy transmission line terminated with a short circuit will have:

Which will reduce the radiation loss of transmission line?

Which of the following can be determined using a slotted line method?

A transmission line terminated with an open has a VSWR of:

Near-end crosstalk is best defined as

A quarter-wavelength transmission line is terminated with a 300 ohm load. Its input impedance is 75 ohms. Its characteristic impedance is:

Moving a full revolution around an SWR circle on the Smith chart represents:

A transmission line that is terminated with a resistive load that is equal to the characteristic impedance of the line is called:

Wiring of the RJ-45 connector CAT6 cable is defined by the telecommunications industry standard:

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters

Exam 12: Transmission Lines

The input impedance of a half-wavelength section of 50 ohm transmission line that is terminated with an open is:

A transmission line terminated with an open has a reflection coefficient at the load of:

A commonly used coaxial cable, RG-58, has a characteristic impedance of 50 ohms. If the spacing between the conductors is doubled, its characteristic impedance will:

What makes conductors behave differently at high frequencies than they do at low frequencies?

33. The perimeter of the Smith chart graph represents:

At resonance, a series RLC circuit will be:

One use of a quarter-wavelength transformer is:

The center of the Smith chart represents:

The disadvantage of not having a perfectly matched transmission line in a communication system is:

Which of the following is not an application of a transmission line?

A pulse-technique used in determining the location of a fault in a transmission line is called:

A non-lossy transmission line terminated with a short circuit will have:

Which will reduce the radiation loss of transmission line?

Which of the following can be determined using a slotted line method?

A transmission line terminated with an open has a VSWR of:

Near-end crosstalk is best defined as

A quarter-wavelength transmission line is terminated with a 300 ohm load. Its input impedance is 75 ohms. Its characteristic impedance is:

Moving a full revolution around an SWR circle on the Smith chart represents:

A transmission line that is terminated with a resistive load that is equal to the characteristic impedance of the line is called:

Wiring of the RJ-45 connector CAT6 cable is defined by the telecommunications industry standard:

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters