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Subel. 7
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Subelement 7

Feedlines - Matching and Antennas

Section 7-02

velocity factor, effect of line terminated in non-characteristic impedance

What kind of impedance does a quarter wavelength transmission line present to the source when the line is shorted at the far end?

  • The same as the characteristic impedance of the transmission line
  • The same as the output impedance of the source
  • Correct Answer
    A very high impedance
  • A very low impedance
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What kind of impedance does a quarter wavelength transmission line present to the source if the line is open at the far end?

  • A very high impedance
  • The same as the output impedance of the source
  • The same as the characteristic impedance of the transmission line
  • Correct Answer
    A very low impedance
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What kind of impedance does a half wavelength transmission line present to the source when the line is open at the far end?

  • The same as the characteristic impedance of the transmission line
  • The same as the output impedance of the source
  • Correct Answer
    A very high impedance
  • A very low impedance
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What kind of impedance does a half wavelength transmission line present to the source when the line is shorted at the far end?

  • A very high impedance
  • The same as the characteristic impedance of the transmission line
  • Correct Answer
    A very low impedance
  • The same as the output impedance of the source
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What is the velocity factor of a transmission line?

  • 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
  • Correct Answer
    The velocity of the wave on the transmission line divided by the velocity of light
  • The ratio of the characteristic impedance of the line to the terminating impedance
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What is the term for the ratio of the actual velocity at which a signal travels through a transmission line to the speed of light in a vacuum?

  • Characteristic impedance
  • Surge impedance
  • Standing wave ratio
  • Correct Answer
    Velocity factor
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What is a typical velocity factor for coaxial cable with polyethylene dielectric?

  • 0.33
  • Correct Answer
    0.66
  • 0.1
  • 2.7
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What determines the velocity factor in a transmission line?

  • The line length
  • The centre conductor resistivity
  • The terminal impedance
  • Correct Answer
    Dielectrics in the line
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Why is the physical length of a coaxial cable shorter than its electrical length?

  • The surge impedance is higher in the parallel feed line
  • Skin effect is less pronounced in the coaxial cable
  • The characteristic impedance is higher in a parallel feed line
  • Correct Answer
    RF energy moves slower along the coaxial cable than in air
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The reciprocal of the square root of the dielectric constant of the material used to separate the conductors in a transmission line gives the ________ of the line:

  • Correct Answer
    velocity factor
  • VSWR
  • impedance
  • hermetic losses
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The velocity factor of a transmission line is the:

  • Correct Answer
    ratio of the velocity of propagation in the transmission line to the velocity of propagation in free space
  • impedance of the line, e.g. 50 ohm, 75 ohm, etc.
  • speed at which the signal travels in free space
  • speed to which the standing waves are reflected back to the transmitter
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