Which of the following is true for communication via optical fiber?
- AOptical fibers have a uniform core with matching cladding.
- BOptical fibers have a graded refractive index.
- COptical fibers are susceptible to external electromagnetic interference.
- DOptical fibers have very low transmission loss.
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Similar Questions
In a communication system,what is used to extend the range of a communication?
Given below in the left column are different modes of communication using the kinds of waves given in the right column.
$A$. Optical Fiber Communication $P$. Ultrasound $B$. Radar $Q$. Infrared Light $C$. Sonar $R$. Microwaves $D$. Mobile Phones $S$. Radio Waves
From the options given below, find the most appropriate match between entries in the left and the right column.
| $A$. Optical Fiber Communication | $P$. Ultrasound |
| $B$. Radar | $Q$. Infrared Light |
| $C$. Sonar | $R$. Microwaves |
| $D$. Mobile Phones | $S$. Radio Waves |
From the options given below, find the most appropriate match between entries in the left and the right column.
Which of the following is the disadvantage of $FM$ over $AM$?
Easy
View SolutionMatch Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).Column $A$ Column $B$ $A$. $D$-layer $I$. $250-400 \ km$ $B$. $E$-layer $II$. $170-190 \ km$ $C$. $F_1$-layer $III$. $95-120 \ km$ $D$. $F_2$-layer $IV$. $65-75 \ km$
| Column $A$ | Column $B$ |
| $A$. $D$-layer | $I$. $250-400 \ km$ |
| $B$. $E$-layer | $II$. $170-190 \ km$ |
| $C$. $F_1$-layer | $III$. $95-120 \ km$ |
| $D$. $F_2$-layer | $IV$. $65-75 \ km$ |
An $FM$ broadcast transmitter,using a modulating signal of frequency $20\,kHz$,has a deviation ratio of $10$. The bandwidth required for transmission is $.......kHz$.
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