Transmission Lines Quiz

<p>The current flow is completely concentrated on the outside surface of the conductor (B)</p> Signup and view all the answers

<p>Ac resistance is directly proportional to dc resistance, with a factor called the resistance ratio (D)</p> Signup and view all the answers

<p>The ratio of the velocity of propagation of the signal in the transmission line to the speed of light in a vacuum (C)</p> Signup and view all the answers

<p>Conductor diameter (A)</p> Signup and view all the answers

<p>To decrease the attenuation of the signal (C)</p> Signup and view all the answers

<p>About 10,000 (B)</p> Signup and view all the answers

<p>The SWR is infinite. (D)</p> Signup and view all the answers

<p>To remove the reactive component to match the transmission line. (A)</p> Signup and view all the answers

<p>Philip H. Smith (C)</p> Signup and view all the answers

<p>Inferior quality (A)</p> Signup and view all the answers

<p>Attenuation of the signal (C)</p> Signup and view all the answers

<p>Transverse electromagnetic waves (A)</p> Signup and view all the answers

<p>The displacement is perpendicular to the direction of propagation (D)</p> Signup and view all the answers

<p>They consist of E and H fields that are perpendicular to each other. (B)</p> Signup and view all the answers

<p>It behaves more peculiarly and becomes more involved. (D)</p> Signup and view all the answers

<p>An insulator or dielectric (D)</p> Signup and view all the answers

<p>Both low-frequency AC and high-frequency signals (C)</p> Signup and view all the answers

<p>The 90° angle between the E and H fields at all points (B)</p> Signup and view all the answers

<p>Energy is dissipated in the load. (B)</p> Signup and view all the answers

<p>Resistance (B)</p> Signup and view all the answers

<p>From its physical dimensions. (A)</p> Signup and view all the answers

<p>It is purely resistive and equal to Zo. (D)</p> Signup and view all the answers

<p>The line behaves like an infinite line. (A)</p> Signup and view all the answers

<p>There are no reflected waves. (C)</p> Signup and view all the answers

<p>Decibels per unit length (B)</p> Signup and view all the answers

<p>All incident power is dissipated. (A)</p> Signup and view all the answers

<p>The total voltage is zero. (C)</p> Signup and view all the answers

<p>It is reflected back without phase reversal. (D)</p> Signup and view all the answers

<p>The energy reflects back to the load. (A)</p> Signup and view all the answers

<p>It is reflected back as if it were to continue. (C)</p> Signup and view all the answers

<p>It is maximum at the open. (D)</p> Signup and view all the answers

<p>Parallel LC circuit. (C)</p> Signup and view all the answers

<p>They tend to radiate a significant amount of energy. (B)</p> Signup and view all the answers

<p>It behaves like a pure inductance. (C)</p> Signup and view all the answers

<p>Zo = (L/C)^1/2 (B)</p> Signup and view all the answers

<p>The load must be purely resistive and equal to the characteristic impedance. (D)</p> Signup and view all the answers

<p>The line can store energy indefinitely without dissipation. (A)</p> Signup and view all the answers

<p>The inductance and capacitance distributed along the line. (A)</p> Signup and view all the answers

<p>To avoid the need for impedance measurements in practice. (C)</p> Signup and view all the answers

<p>It is influenced by the impedance of connected loads. (B)</p> Signup and view all the answers

<p>Using a purely resistive load that matches the surge impedance. (C)</p> Signup and view all the answers

<p>To measure the inductance and capacitance of the transmission line. (A)</p> Signup and view all the answers

A system that transmits electrical energy between two points.

A type of wave where the displacement of the wave is perpendicular to the direction it's traveling.

A type of wave that is generated by the movement of an electric charge. It consists of both electric and magnetic fields.

A type of electromagnetic wave that travels on a transmission line, with electric and magnetic fields perpendicular to each other.

The ability of a transmission line to carry a signal without losing too much energy.

The unwanted emission of radio waves from a transmission line.

The relationship between the electric and magnetic fields in space in a TEM wave, where they are at right angles to each other.

The behavior of transmission lines becomes more complex when carrying high frequency signals compared to low frequencies.

The impedance seen looking into a line of n such sections is determined from the following expression: For extremely low frequencies, the resistances dominate. For extremely high frequencies, the inductance and capacitance dominate.

The characteristic impedance of a two-wire parallel transmission line with an air dielectric can be determined from its physical dimensions. The characteristic impedance of a concentric coaxial cable can also be determined from its physical dimensions.

The input impedance of an infinitely long line at radio frequencies is resistive and equal to Zo. Electromagnetic waves travel down the line without reflections; such a line is called non-resonant. The ratio of voltage to current at any point along the line is equal to Zo. The incident voltage and current at any point along the line are in phase.

Line losses on a non-resonant line are minimum per unit length. Any transmission line that is terminated in a purely resistive load equal to Z acts like an infinite line.

✓Zi = Zo ✓There are no reflected waves. ✓V and I are in phase. ✓There is maximum transfer of power from source to load.

Sometimes called propagation coefficient, is used to express the attenuation (signal loss) and the phase shift per unit length of a transmission line. Used to determine the reduction in voltage or current with distance as a TEM wave propagates down a transmission line. For an infinitely long line, all of the incident power is dissipated in the resistance of the wire as the wave propagates down the line. With an infinitely long line or a line that looks infinitely long, such as a finite line terminated in a matched load (Za = ZL), no energy is returned or reflected back toward the source.

The speed at which an electromagnetic wave propagates through a transmission line.

The ratio of the velocity of propagation in a transmission line to the speed of light in a vacuum.

The loss of power in a transmission line due to the resistance of the conductors.

The phenomenon where the current flow in a conductor is concentrated near the surface at higher frequencies.

The ratio of the AC resistance of a conductor to its DC resistance.

The attenuation experienced by a signal as it travels along a transmission line.

A measure of the power loss in a transmission line.

The power delivered to the load after passing through a transmission line.

A section of transmission line with a length equal to one-quarter of the wavelength of the signal being transmitted.

A type of impedance matching technique that uses a short section of transmission line to cancel out reactive component of the load impedance.

A specialized graphical tool used to solve transmission line problems visually. It represents complex impedance as a point on a circular graph.

A measure of the ability of a circuit to store energy. A high Q factor indicates that the circuit can store more energy than it dissipates.

The ratio of the reflected power to the incident power. A value of 1 indicates all power is reflected, while 0 indicates all power is transmitted.

The impedance seen looking into an infinitely long transmission line, or a finite length terminated by a resistive load equal to its own value.

The condition where maximum power is transferred from the source to the load, with no energy reflected back.

A transmission line with infinite length stores energy indefinitely, acting like a resistor dissipating all incoming energy.

The ability of a transmission line to store energy in its inductance and capacitance.

The ratio of inductance (L) to capacitance (C) of a transmission line, with units of ohms.

The resistance seen by an RF generator connected to a transmission line.

A condition where the energy from the source is reflected back towards the source, instead of being fully absorbed by the load.

The process of adjusting the load impedance to match the characteristic impedance of the transmission line, minimizing reflected energy.

A shorted transmission line, where the load impedance is zero, causes the voltage wave to be reflected back with a 180-degree phase shift. The reflected wave cancels out the incident wave at the short, resulting in zero voltage at that point.

Voltage waves on a shorted transmission line are reflected back with a 180-degree phase shift, effectively canceling out the incident wave at the short.

Current waves on a shorted transmission line are reflected back without a phase shift, adding to the incident wave at the short.

An open-circuit transmission line, with an infinitely high load impedance, causes the voltage wave to be reflected back without a phase shift. This leads to a maximum voltage at the open end.

Voltage waves on an open transmission line are reflected back without a phase shift, reinforcing the incident wave at the open end.

Current waves on an open transmission line are reflected back with a 180-degree phase shift, effectively canceling out the incident wave at the open end.

A shorted quarter-wavelength transmission line acts like a parallel LC circuit, effectively creating an open circuit at the resonant frequency.

Shorted transmission line sections can create inductance or capacitance depending on their length. Sections shorter than a quarter-wavelength act as inductors, while sections longer than a quarter-wavelength act as capacitors.