Electronics and Communication Engineering - Microwave Communication - Discussion

1. 

The velocity factor of a transmission line depends on

[A]. temperature
[B]. skin effect
[C]. relative permittivity of dielectric
[D]. none of the above

Answer: Option C

Explanation:

r of a dielectric changes with humidity.


Kalpana said: (Dec 8, 2015)  
Explain clearly?

Sunny Goyal said: (Apr 24, 2016)  
The velocity factor (VF) is also called wave propagation, speed or velocity of propagation (VoP or v_\mathrm{P}), of a transmission medium.

It is the ratio of the speed at which a wavefront (of an acoustic signal, for example, or an electromagnetic signal, a radio signal, a light pulse in a fibre channel or a change of the electrical voltage on a copper wire) passes through the medium, to the speed of light in a vacuum.

For optical signals, the velocity factor is the reciprocal of the refractive index.

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