Chapter 20: Problem 2679
Which of the Following is not a component of communication System? (A) Transmitter (B) Transmission channel (C) Noise (D) Receiver
Chapter 20: Problem 2679
Which of the Following is not a component of communication System? (A) Transmitter (B) Transmission channel (C) Noise (D) Receiver
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Get started for freeThe refractive index of the ionosphere (A) increase as we go from the lower to upper layer of the ionosphere (B) decrease as we go from the lower to upper layer of the ionosphere (C) remain the same through out the ionosphere (D) is equal to unity
An antenna can transmit \(\quad\) radiation with more efficiency. (A) low frequency (B) high frequency (C) long wave length (D) None of these
A silicon optical fiber has a core refractive index of \(1.50\) and a cladding refractive index \(1.47\) what is the numerical aperture of the fiber? (A) \(0.90\) (B) \(0.60\) (C) \(0.45\) (D) \(0.30\)
Modulation is used to (A) reduce the band width used (B) separate the transmission of different areas (C) ensure that information may be transmitted to long distance (D) allow the use of practical antennas
A transmitting antenna at the top of a tower has a height of \(50 \mathrm{~m}\) and the height of the receiving antenna is \(32 \mathrm{~m}\). The maximum distance between them for satisfactory communication in line of sight mode is Given radius of earth \(\mathrm{R}=6400 \mathrm{~km}\) (A) \(25.29 \times 10^{3} \mathrm{~km}\) (B) \(20.23 \times 10^{3} \mathrm{~km}\) (C) \(45.5 \mathrm{~km}\) (D) None of these.
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