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 freeThe band width of Audio signal is (A) \(20 \mathrm{HZ}\) (B) \(20 \mathrm{KHZ}\) (C) \(20 \mathrm{MHZ}\) (D) \(20 \mathrm{GHZ}\)
Space waves are generally propagated in (A) UHF (B) VHF (C) HF (D) None of there
Wave impedance of free space is (A) Zero (B) \(376.6 \Omega\) (C) \(33.6 \Omega\) (D) \(3.76 \Omega\)
A T.V tower has a height of \(80 \mathrm{~m}\). The maximum distance up to which T.V transmission can be received is equal to (radius of earth $=6.4 \times 10^{6} \mathrm{~m}$ ) (A) \(16 \mathrm{~km}\) (B) \(32 \mathrm{~km}\) (C) \(80 \mathrm{~km}\) (D) \(160 \mathrm{~km}\)
In satellite communication \(6 \mathrm{GHz}\) frequency is used for and $4 \mathrm{GHz}$ frequency is used for (A) uplink, down link (B) down link, up link (C) modulation, demodulation (D) demodulation, modulation
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