206. The disadvantage of FSK is that—
     

1. 1. It does not provide sufficient S/N ratio
      

   
   
   

   2. It does not have low error probability
      

   
   
   

   3. It is not sufficient in its use of spectrum space
      

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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207. FSK is preferred to ASK in applications where—

1. 1. Fading of signal is prevalent

   
   
   

   2. Synchronous detection is not feasible

   
   
   

   3. Both of these

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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208. The disadvantage of coherent FSK detection is that—

1. 1. it leads to high signal fading

   
   
   

   2. it requires two synchronized oscillations

   
   
   

   3. Both of these

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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209. In FSK, the threshold level is independent of—
     

1. 1. Carrier amplitude
      

   
   
   

   2. Carrier frequency
      

   
   
   

   3. Both of these
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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210. In a single sideband suppressed carrier AM system, the modulation index is changed from 0 to 1, the power content of the signal—

1. 1. will be quadrupled.
      

   
   
   

   2. will be doubled.
      

   
   
   

   3. will increase by 50 per cent.
      

   
   
   

   4. will increase by 25 per cent.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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