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
Electronic communication is not possible if
  1. If the temperature is high
  2. If the humidity is high
  3. If smell or touch is to be transmitted
  4. If message or information is not available in the form of electrical signals
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
The cladding which surrounds the fibre core:
  1. Is used to protect the fibre
  2. Is used to reduce interference
  3. Is used to reduce diffraction
  4. Is helps to guide the light signals through the core
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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