Q. On modulating a carrier of frequency fc by an audio signal fs, the following components has resulted:

fc, fc + fs and fc - fs

What is this type of modulation likely to be?

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Q. Strength of space wave is not dependent on distance.

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Q. Which of the following is not necessarily the advantage of SSB over double sideband, full carrier AM?

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Q. A signal m(t) = 5 cos 2π 100 t frequency modulates a carrier. The resulting FM signal is

10 cos {(2π10⁵ t) + 15 sin (2π 100 t)}

The approximate bandwidth of the FM would be

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Q. Some possible functions of AGC in a TV receiver are

1. To increase gain for weak signals
2. To decrease gain for strong signals
3. To change the contrast when we switch from one channel to other
4. To reduce flutter

Which of the above are correct?

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Q. The satellites used for intercontinental communication are called

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Q. Armoured submarine cable is used

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Q. The frequency deviation of a FM signal produced from PM is

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Q. Good frequency stability can be available

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Q. Assertion (A): The unit of telephone traffic measurement is erlang.

Reason (R): International circuits for communication are fitted with echo suppressors.

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Q. The primary colours are

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Q. The most commonly used system of modulating for telegraphy is

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Q. Which of the following antennas is not wide band?

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Q. In phase shift keying the input signal is

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Q. A circuit which cannot demodulate SSB is

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Q. In TV system in India IF video and IF audio frequencies are

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Q. While AM has __________ frequencies, FM has __________ number of sidebands.

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Q. In VHS format diameter of head drum is about

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Q. The correct sequence of subsystem in an FM receiver is

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Q. A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is

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