Class XII

The three elements of a generalized communication system are
  1. Transmitter, multiplier and receiver
  2. Transmitter, noise generator and receiver
  3. Transmitter, transmission channel and receiver
  4. Transmitter, transmission channel and detector
Which of these is an example of point to point communication?
  1. TV
  2. FM Radio
  3. AM Radio
  4. Telephony
Noise in electronic communication refers to
  1. Noise produced by sound
  2. Noise produced by whistles
  3. unwanted signals that are mixed up with messages
  4. signals that are amplified for performance
Electronic communication refers to
  1. transfer of electricity from one point to another
  2. transfer of messages encoded in electrical signals
  3. transfer of information encoded in electrical signals
  4. transfer of information or messages encoded in electrical signals
Maximum usable frequency (MUF) is F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 60}°, the x is:
  1. 150 MHz
  2. 170 MHz
  3. 175 MHz
  4. 190 MHz
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