Advertisements
Advertisements
प्रश्न
I-V characteristics of four devices are shown in Figures.
 |
 |
 |
|
| (i) | (ii) | (iii) | (iv) |
Identify devices that can be used for modulation.
पर्याय
'i’ and ‘iii’.
only ‘iii’.
‘ii’ and some regions of ‘iv’.
All the devices can be used.
उत्तर
‘ii’ and some regions of ‘iv’.
Explanation:
A square law modulator is a device which can produce modulated waves by the application of the message signal and the carrier wave.
A square law modulator is used for modulation purposes. Characteristics shown by (i) and (iii) correspond to linear devices.
And by (ii) corresponds to the square law device which shows non-linear relations. Some parts of (iv) also follow square law.
Hence, (ii) and (iv) can be used for modulation.
APPEARS IN
संबंधित प्रश्न
Define modulation and transducer
Define modulation index.
Draw a sketch of a sinusoidal carrier wave along with a modulating signal and show how these are superimposed to obtain the resultant amplitude modulated wave
The carrier wave is given by
C(t) = 2sin(8πt) volt.
The modulating signal is a square wave as shown. Find modulation index.
Due to economic reasons, only the upper sideband of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.
In a communication system, what is meant by modulation?
The carrier wave is represented by
Define the term modulation. Draw a block diagram of a simple modulator for obtaining AM signal ?
Broadcasting antennas are generally ______.
A 100 m long antenna is mounted on a 500 m tall building. The complex can become a transmission tower for waves with λ.
