Q. A plot of modulation index vs carrier amplitude yields a

View solution

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?

View solution

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

View solution

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

View solution

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

View solution

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?

View solution

Q. The satellites used for intercontinental communication are called

View solution

Q. Armoured submarine cable is used

View solution

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

View solution

Q. Good frequency stability can be available

View solution

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

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

View solution

Q. The primary colours are

View solution

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

View solution

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

View solution

Q. In phase shift keying the input signal is

View solution

Q. A circuit which cannot demodulate SSB is

View solution

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

View solution

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

View solution

Q. In VHS format diameter of head drum is about

View solution

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

View solution