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What is the phase relationship between the incident and reflected voltage waves in an open-ended transmission line with an ac signal applied?
What is the phase relationship between the incident and reflected voltage waves in an open-ended transmission line with an ac signal applied?
What type of circuit does a series-resonant circuit act as when the frequency is above the generator frequency?
What type of circuit does a series-resonant circuit act as when the frequency is above the generator frequency?
What is the resultant of the incident and reflected voltage waves called?
What is the resultant of the incident and reflected voltage waves called?
How is the value of the standing wave figured?
How is the value of the standing wave figured?
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What condition exists at the end of a shorted transmission line?
What condition exists at the end of a shorted transmission line?
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Which of the following transmission line sections can be used as a parallel-resonant circuit?
Which of the following transmission line sections can be used as a parallel-resonant circuit?
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What is the phase relationship between the standing waves of voltage and current in an open-ended transmission line?
What is the phase relationship between the standing waves of voltage and current in an open-ended transmission line?
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Which of the following is NOT a characteristic of a resonant circuit?
Which of the following is NOT a characteristic of a resonant circuit?
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What type of circuit appears as a very high resistance at resonance?
What type of circuit appears as a very high resistance at resonance?
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What is the condition for a long transmission line where the characteristic impedance can be determined using the method of calculating the impedance of the entire line?
What is the condition for a long transmission line where the characteristic impedance can be determined using the method of calculating the impedance of the entire line?
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When a transmission line is terminated in an inductive reactance, what phase shift takes place with respect to the current and voltage?
When a transmission line is terminated in an inductive reactance, what phase shift takes place with respect to the current and voltage?
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What is the term for a device used to radiate or receive electromagnetic wave energy?
What is the term for a device used to radiate or receive electromagnetic wave energy?
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What happens to the voltage along the length of a transmission line when it is not terminated in its characteristic impedance?
What happens to the voltage along the length of a transmission line when it is not terminated in its characteristic impedance?
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When a transmission line is terminated in a resistance greater than Z0, what is the condition at the end of the line?
When a transmission line is terminated in a resistance greater than Z0, what is the condition at the end of the line?
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When should lumped values for transmission-line constants be used to calculate characteristic impedance?
When should lumped values for transmission-line constants be used to calculate characteristic impedance?
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On a standing wave, what are the points of high current and voltage identified by?
On a standing wave, what are the points of high current and voltage identified by?
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What happens to the incident energy that is NOT transferred to the load when a transmission line is not terminated in its characteristic impedance?
What happens to the incident energy that is NOT transferred to the load when a transmission line is not terminated in its characteristic impedance?
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Compared to a dc input, what relative amount of time is required for an ac input voltage to travel the length of the line?
Compared to a dc input, what relative amount of time is required for an ac input voltage to travel the length of the line?
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What is the condition at the open end of a transmission line?
What is the condition at the open end of a transmission line?
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When a transmission line is terminated in a resistance equal to Z0, what is the condition at the end of the line?
When a transmission line is terminated in a resistance equal to Z0, what is the condition at the end of the line?
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What is the condition for a long transmission line where the current flows indefinitely?
What is the condition for a long transmission line where the current flows indefinitely?
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What is the method of determining the characteristic impedance of a transmission line by calculating the impedances at each end of the line?
What is the method of determining the characteristic impedance of a transmission line by calculating the impedances at each end of the line?
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What is the phase shift between the current and voltage on a transmission line terminated in an inductive reactance?
What is the phase shift between the current and voltage on a transmission line terminated in an inductive reactance?
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What is the characteristic impedance of a long transmission line that is infinitely large?
What is the characteristic impedance of a long transmission line that is infinitely large?
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Study Notes
Transmission Lines
- A series-resonant circuit appears as a very high resistance at resonance.
Phase Shifts
- When a transmission line is terminated in an inductive reactance, both voltage and current are phase-shifted.
- In an open-ended transmission line with an ac signal applied, the phase relationship between the reflected voltage waves is 180 degrees out of phase.
Devices
- A device used to radiate or receive electromagnetic wave energy is referred to as an antenna.
- A shorted 1/4-wavelength section or an open 1/4-wavelength section of a transmission line can be used as a parallel-resonant circuit.
Transmission Line Conditions
- When a transmission line is terminated in a resistance greater than Z0, the end of the line appears as an open circuit.
- On an open-ended transmission line, the points of high current and voltage are identified by peaks.
- On a standing wave, the points of high current and voltage are identified by peaks.
Characteristic Impedance
- The characteristic impedance of a long transmission line may be determined by calculating the impedances at each end of the line or by adding the impedances of successive short sections.
- Lumped values for transmission-line constants should be used to calculate characteristic impedance when the line is short compared to one wavelength.
Standing Waves
- The resultant of the incident and reflected voltage waves is called the standing wave.
- On an open-ended transmission line, standing waves of voltage and current form, where current flows indefinitely.
- When a transmission line is not terminated in its characteristic impedance (Z0), the incident energy that is not transferred to the load is returned along the transmission line.
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Description
This quiz covers the concepts of transmission lines, phase shifts, and devices used in electromagnetic energy transmission, including antennas and shorted transmission lines.
