What is the velocity factor of a transmission line?

- The ratio of the characteristic impedance of the line to the terminating impedance
- The index of shielding for coaxial cable
- The velocity of the wave in the transmission line multiplied by the velocity of light in a vacuum
- The velocity of the wave in the transmission line divided by the velocity of light in a vacuum

Which of the following has the biggest effect on the velocity factor of a transmission line?

- The termination impedance
- The line length
- Dielectric materials used in the line
- The center conductor resistivity

Why is the physical length of a coaxial cable transmission line shorter than its electrical length?

- Skin effect is less pronounced in the coaxial cable
- The characteristic impedance is higher in a parallel feed line
- The surge impedance is higher in a parallel feed line
- Electrical signals move more slowly in a coaxial cable than in air

What impedance does a 1/2-wavelength transmission line present to a generator when the line is shorted at the far end?

- Very high impedance
- Very low impedance
- The same as the characteristic impedance of the line
- The same as the output impedance of the generator

What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 14.1 MHz?

What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?

How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?

Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric cable, assuming all other parameters are the same?

- Foam dielectric has lower safe operating voltage limits
- Foam dielectric has lower loss per unit of length
- Foam dielectric has higher velocity factor
- All these choices are correct

What is the approximate physical length of a foam polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 7.2 MHz?

What impedance does a 1/8-wavelength transmission line present to a generator when the line is shorted at the far end?

- A capacitive reactance
- The same as the characteristic impedance of the line
- An inductive reactance
- Zero

What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?

- The same as the characteristic impedance of the line
- An inductive reactance
- A capacitive reactance
- Infinite

What impedance does a 1/4-wavelength transmission line present to a generator when the line is open at the far end?

- The same as the characteristic impedance of the line
- The same as the input impedance to the generator
- Very high impedance
- Very low impedance

What impedance does a 1/4-wavelength transmission line present to a generator when the line is shorted at the far end?