Chapter 20: Problem 2668
Type of communication Possible by Modem duplex is (A) Half duplex (B) Simplex (C) Double Duplex (D) Full duplex
Chapter 20: Problem 2668
Type of communication Possible by Modem duplex is (A) Half duplex (B) Simplex (C) Double Duplex (D) Full duplex
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Get started for freeA 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) \(160 \mathrm{~km}\)
Which range of Frequencies is Suitable for sky wave Propagation ? (A) \(1 \mathrm{KHZ}\) to \(500 \mathrm{KHZ}\) (B) \(1 \mathrm{MHZ}\) to \(2 \mathrm{MHZ}\) (C) \(2 \mathrm{MHZ}\) to \(20 \mathrm{MHZ}\) (D) Above \(30 \mathrm{MHZ}\)
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) \(3 \times 10^{10}\)
For an amplitude modulated wave, the maximum amplitude is found to be $9 \mathrm{~V}\( while the minimum amplitude is found to be \)3 \mathrm{~V}$. The modulation index is (A) \(100 \%\) (B) \(75 \%\) (C) \(50 \%\) (D) \(25 \%\)
The energy attenuation in optical fiber is mainly due to (A) absorption (B) scattering (C) both a and \(\mathrm{b}\) (D) neither absorption nor scattering
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