In optical communication system operating at 1200nm, only 2% of the source frequency is available for TV t ransmission having a bandwidth of 5 MHz. the number of TV channels that can be transmitted isA. 2 millionB. 10 millionC. 0.1 millionD. 1 million

In optical communication system operating at 1200nm, only 2% of the so

1.	In optical communication system operating at 1200nm, only 2% of the source frequency is available for TV t ransmission having a bandwidth of 5 MHz. the number of TV channels that can be transmitted isA. 2 millionB. 10 millionC. 0.1 millionD. 1 million
Answer» Correct Answer - D Optical source frequency, `v=(c)/(lambda)` or `v=(3xx10^(8)xxms^(-1))/(1200xx10^(-9)m)=2.5xx10^(14)Hz` Bandwidth of channel=2% of the source frequency `=(2)/(100)xx2.5xx10^(14)Hz=5xx10^(12)Hz`. Number of channels `=("Total bandwidth of channel")/("Bandwidth needed per channel")` `=(5xx10^(12)Hz)/(5xx10^(6)Hz)=10^(6)`=1 million

Discussion

No Comment Found

Related InterviewSolutions

Which of the following frequencies will be suitable for beyond the horizon communication using sky waves?A. 10KHzB. 10MHzC. 1GHzD. 1000GHz
A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due toA. poor selection of modulation index (selected `0ltmlt1`)B. poor bandwidth selection of amplitudesC. poor selection of carrier frequencyD. loss of energy in transmission
Modern is a device which performsA. 1. modulationB. 2. demodulationC. 3. rectificationD. 4. modulation and demodulation
The device which is a combination of a receiver and a transmitter isA. 1. AmplifierB. 2. RepeaterC. 3. TransducerD. 4. Modulator
Modulation is the process of superposingA. low frequency audio signal on high frequency radio waves.B. low frequency radio signals on low frequency audio wave.C. high frequency radio signal on low frequency audo signal.D. high frequency audio signal on low frequency radio waves.
A `100m` long antenna is mounted on a `500m` tall building. The complex can become a transmission tower of waves with `lambda`A. `-400m`B. `-25m`C. `-150m`D. `-2400m`
A ` 1 KW ` signal is transmitted using a communication channel which provides attenuatiom at the rate of ` - 2 dB per km` . If the communication channel has a total length of ` 5 km` , the power of the signal received is [ gain in `dB = 10 log ((P_(0))/(P_(i)))]`A. 900WB. 100WC. 990WD. 1010W
Assertion: Amplification is necessary to compensate for the attenualtion of the signal in communication system. Reason: Amplification is the process of increasing the amplitdue and consequently the strength of a signal using an electronic circuit.
The skip zone in radio wave trasmission is that range whereA. there is no reception of either ground wave or sky waveB. the reception of ground wave is maximum b ut that of sky wave is minimumC. the reception of ground wave is minimum, but that of sky wave is maximumD. the reception of both ground and sky wave is maximum.
A fax message is to be sent from Delhi to Washington via a geostationary satellite. The minimum distance between the dispatch and its getting received is (Take height of the geostationary satellite=36000km)A. `72xx10^(3)km`B. `12xx10^(3)km`C. `27xx10^(3)km`D. `18xx10^(3)km`

In optical communication system operating at 1200nm, only 2% of the source frequency is available for TV t ransmission having a bandwidth of 5 MHz. the number of TV channels that can be transmitted isA. 2 millionB. 10 millionC. 0.1 millionD. 1 million

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment