Class XII

In Digital type signals, signals can take
  1. only continuous values
  2. only discrete stepwise values
  3. only frequency modulated values
  4. only amplitude modulated values
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
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
In an amplitude modulated wave for audio frequency of 500 cycles / sec, the appropriate carrier frequency will be:
  1. 50 cycles / sec
  2. 100 cycles / sec
  3. 500 cycles / sec
  4. 50,000 cycles /sec
Transmitter is a device that
  1. Inverts the message
  2. Clips the message signal
  3. Makes the message contain parts of the spectrum
  4. Makes the message suitable for transmission and reception
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