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 has the biggest effect on 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 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

E9F05:

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?

1. 10.6 meters
2. 5.3 meters
3. 4.3 meters
4. 3.5 meters

E9F06:

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?

1. 7.0 meters
2. 8.5 meters
3. 10.6 meters
4. 13.3 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:

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 these choices are correct

E9F09:

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?

1. 10.4 meters
2. 8.3 meters
3. 6.9 meters
4. 5.2 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. Zero

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. Infinite

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