Digital Communication System MCQs
Practice free Digital Communication System multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 252 questions — no login required.
Question 109easy
In a grated index fiber, as radial distance (r) is varied from fiber axis to the core cladding interface, the numerical aperture
Question 110easy
If (L) is the length of the fiber, then for length of fibers, the pulse spreading per km is directly proportional to
Question 111easy
If (L) is the length of the fiber, then for longfiber lengths, pulse spreading per km is directly proportonal to
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Question 112easy
A given fiber has core refractive index of 1.5 and a core cladding index difference factor (A) of 0.01125. The numerical aperature is
Question 113easy
Small values of Numerical Aperture (NA) decrease the pulse dispersion but increase losses due to
Question 114easy
Optical fibers rely for their operation on the phelomenon of
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Question 115easy
What is normally the difference in the refractive indices of fiber core and fiber cladding in commercially available fibers?
Question 116easy
The optical fiber characterised by SELF FOCUSSING effect
Question 117easy
For a given freespace wavelength (X0), the number of propagation modes that are possible