E9F01:

What is the velocity factor of a transmission line?

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

E9F02:

Which of the following determines the velocity factor of a transmission line?

  1. The termination impedance
  2. The line length
  3. Dielectric materials used in the line
  4. The center conductor resistivity

E9F03:

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

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

E9F04:

What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

  1. 2.7
  2. 0.66
  3. 0.30
  4. 0.10

E9F05:

What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz?

  1. 20 meters
  2. 2.3 meters
  3. 3.5 meters
  4. 0.2 meters

E9F06:

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

  1. 15 meters
  2. 20 meters
  3. 10 meters
  4. 71 meters

E9F07:

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

  1. Lower loss
  2. Higher SWR
  3. Smaller reflection coefficient
  4. Lower velocity factor

E9F08:

What is the term for the ratio of the actual speed at which a signal travels through a transmission line to the speed of light in a vacuum?

  1. Velocity factor
  2. Characteristic impedance
  3. Surge impedance
  4. Standing wave ratio

E9F09:

What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?

  1. 10 meters
  2. 6.9 meters
  3. 24 meters
  4. 50 meters

E9F10:

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

  1. A capacitive reactance
  2. The same as the characteristic impedance of the line
  3. An inductive reactance
  4. The same as the input impedance to the final generator stage

E9F11:

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

  1. The same as the characteristic impedance of the line
  2. An inductive reactance
  3. A capacitive reactance
  4. The same as the input impedance of the final generator stage

E9F12:

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

  1. The same as the characteristic impedance of the line
  2. The same as the input impedance to the generator
  3. Very high impedance
  4. Very low impedance

E9F13:

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

  1. Very high impedance
  2. Very low impedance
  3. The same as the characteristic impedance of the transmission line
  4. The same as the generator output impedance

E9F14:

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

  1. Very high impedance
  2. Very low impedance
  3. The same as the characteristic impedance of the line
  4. The same as the output impedance of the generator

E9F15:

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

  1. Very high impedance
  2. Very low impedance
  3. The same as the characteristic impedance of the line
  4. The same as the output impedance of the generator

E9F16:

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

  1. Foam dielectric has lower safe operating voltage limits
  2. Foam dielectric has lower loss per unit of length
  3. Foam dielectric has higher velocity factor
  4. All of these choices are correct