Related InterviewSolutions

• The need for doing modulation isA. to increase the intensity of auido signalB. to decrease the intensity of audio signalC. to transmit audio signal to large distancesD. to increase the frequency of the audio signal
• The most commonly employed analog modulation technique in satellite communication is theA. amplitude modulationB. frequency modulationC. phase modulationD. amplitude modulation
• The process of recovering the audio signal from the modulated wave is known asA. amplificationB. rectificationC. modulationD. demodulation
• A modulating signal is a square wave as shown in the following figure . While the carries wave is given by `e=4 sin (8 pi t)` volt . What is the modulation index ?A. 0.15B. 0.25C. 0.35D. 10.5
• Which of the following is used to produce radio waves of constant amplitude?A. filterB. rectifierC. FETD. oscillator
• Which of the following frequencies will be suitable for beyond the horizon communication using sky waves ?A. 10 kHzB. 10 MHzC. 1 GHzD. 1000 GHz
• Among the follwing frequencies one will be suitable for beyond-the horizon communication using sky waves isA. `10 kHz`B. `10 MHz`C. `1 GHz`D. `1000 GHz`
• In frequency modulationA. Frequency of `CW` remains constant but amplitude changes in accoradance with modulating wave frequencyB. Frequency of `CW` changes in accordance with the modulating wave frequency but the amplitude also changes.C. Frequency of `CW` changes in accordance with the modulating wave frequency but the amplitude remains constant.D. Frequency of `CW` changes in accordance with the amplitude of modulating wave amplitude
• The number of telephonic messages which are carried by a fibre at an instant with much less intensity loss areA. 2400B. 2200C. 2000D. 1800
• Which of the following frequencies will be suitable for beyond the horizon communication using sky waves?A. 10 kHzB. 10 MHzC. 1 GHzD. 1000 GHz