3-J-066: Transmission Lines
3-66J1:
What is the meaning of the term velocity factor of a transmission line?
The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.
The ratio of the characteristic impedance of the line to the terminating impedance.
The velocity of the wave on the transmission line multiplied by the velocity of light in a vacuum.
The index of shielding for coaxial cable.
3-66J2:
What determines the velocity factor in a transmission line?
Dielectrics in the line.
The termination impedance.
The line length.
The center conductor resistivity.
3-66J3:
Nitrogen is placed in transmission lines to:
Prevent moisture from entering the line.
Improve the “skin-effect” of microwaves.
Reduce arcing in the line.
Reduce the standing wave ratio of the line.
3-66J4:
A perfect (no loss) coaxial cable has 7 dB of reflected power when the input is 5 watts. What is the output of the transmission line?
1 watt.
1.25 watts.
2.5 watts.
5 watts.
3-66J5:
Referred to the fundamental frequency, a shorted stub line attached to the transmission line to absorb even harmonics could have a wavelength of:
1/4 wavelength.
1.41 wavelength.
1/2 wavelength.
1/6 wavelength.
3-66J6:
If a transmission line has a power loss of 6 dB per 100 feet, what is the power at the feed point to the antenna at the end of a 200 foot transmission line fed by a 100 watt transmitter?
6 watts.
70 watts.
50 watts.
25 watts.
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