Chapter 20: Problem 2724
What type of medium is used in optical communication? (A) guided medium (B) Unguided medium (C) Both guided and unguided media (D) Neither guided nor unguided media
Chapter 20: Problem 2724
What type of medium is used in optical communication? (A) guided medium (B) Unguided medium (C) Both guided and unguided media (D) Neither guided nor unguided media
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Get started for freeIf \(\mathrm{M}_{1} \& \mathrm{M}_{2}\) are the refractive indices of the material of core and cladding of an optical fiber, than the loss of light due to its leakage can be minimized by having (A) \(\mathrm{M}_{1}>\mathrm{M}_{2}\) (B) \(\mathrm{M}_{1}<\mathrm{M}_{2}\) (C) \(\mathrm{M}_{1}=\mathrm{M}_{2}\) (D) None of these
AM is used for broadcasting because (A) it is more noise immune than other modulation system (B) it requires less transmitting power compared with other system (C) it avoids receiver complexity (D) No other modulation system can provide the necessary band width faithful transmission
The characteristic impedance of a co-axial cable is between (A) \(10 \Omega\) to \(20 \Omega\) (B) \(20 \Omega\) to \(30 \Omega\) (C) \(30 \Omega\) to \(60 \Omega\) (D) \(50 \Omega\) to \(70 \Omega\)
A \(1000 \mathrm{KHz}\) carrier is modulated with \(800 \mathrm{~Hz}\) audio signals. What are the frequencies of first pair side band? (A) \(1000 \mathrm{KHz}\) and \(800 \mathrm{~Hz}\) (B) \(800 \mathrm{~Hz}\) and \(999.2 \mathrm{KHz}\) (C) \(1000.8 \mathrm{KHz}\) and \(999.2 \mathrm{KHz}\) (D) \(1000.8 \mathrm{KHz}\) and \(1000 \mathrm{KHz}\)
To transmit \(1 \mathrm{KHz}\) frequency signal, wave length of the signal should be \(\quad \mathrm{m}\). (A) \(3 \times 10^{3}\) (B) \(3 \times 10^{5}\) (C) \(3 \times 10^{7}\) (D) \(3 \times 10^{10}\)
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