Q5 of 30 Page 98

A message signal of frequency ωm is superposed on a carrier wave of frequency ωc to get an amplitude modulated wave (AM). The frequency of the AM wave will be

The frequency of the modulated wave is the same as that of the carrier wave.

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3

A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in ]

4

A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be

 6

I-V characteristics of four devices are shown in Fig. 15.1 Identify devices that can be used for modulation:


 7

A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to