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`