A-007-02: Velocity factor, effect of line terminated in non-characteristic impedance
A-007-02-01:
What kind of impedance does a quarter 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
The same as the output impedance of the source
A very low impedance
A-007-02-02:
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 low impedance
A very high impedance
The same as the output impedance of the source
The same as the characteristic impedance of the transmission line
A-007-02-03:
What kind of impedance does a half wavelength transmission line present to the source when the line is open at the far end?
A very high impedance
The same as the characteristic impedance of the transmission line
The same as the output impedance of the source
A very low impedance
A-007-02-04:
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 low impedance
A very high impedance
The same as the characteristic impedance of the transmission line
The same as the output impedance of the source
A-007-02-05:
What is the velocity factor of a transmission line?
The velocity of the wave on the transmission line divided by the velocity of light
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
The ratio of the characteristic impedance of the line to the terminating impedance
A-007-02-06:
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?
Velocity factor
Characteristic impedance
Surge impedance
Standing wave ratio
A-007-02-07:
What is a typical velocity factor for coaxial cable with polyethylene dielectric?
0.66
0.33
0.1
2.7
A-007-02-08:
What determines the velocity factor in a transmission line?
Dielectrics in the line
The line length
The centre conductor resistivity
The terminal impedance
A-007-02-09:
Why is the physical length of a coaxial cable shorter than its electrical length?
RF energy moves slower along the coaxial cable than in air
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
A-007-02-10:
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:
velocity factor
VSWR
impedance
hermetic losses
A-007-02-11:
The velocity factor of a transmission line is the:
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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