201. For the data given in Q. 52 what will be the new bandwidth, if modulating frequency is doubled?

1. 1. 170 kHz
      

   
   
   

   2. 190 kHz
      

   
   
   

   3. 180 kHz
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   When modulating frequency is doubled, the new bandwidth BW’ is given by
   BW′ = 2Δf + 2(2f_m)
   = 2 × 75 + 2(2 × 10) = 190 kHz
   

   Correct Option: B

   When modulating frequency is doubled, the new bandwidth BW’ is given by
   BW′ = 2Δf + 2(2f_m)
   = 2 × 75 + 2(2 × 10) = 190 kHz
   

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202. The maximum deviation allowed in an FM broadcast system is 75 kHz. If the modulating signal is a single-tone sinusoid of 10 kHz, then the bandwidth of the FM signal—

1. 1. 170 kHz
      

   
   
   

   2. 190 kHz
      

   
   
   

   3. 150 kHz
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given, Δf = 75 kHz
   f_m = 10 kHz
   The BW is given by,
   BW = 2(Δf + f_m)
   = 2 × 75 kHz + 2 × 10 kHz
   = 170 kHz

   Correct Option: A

   Given, Δf = 75 kHz
   f_m = 10 kHz
   The BW is given by,
   BW = 2(Δf + f_m)
   = 2 × 75 kHz + 2 × 10 kHz
   = 170 kHz

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203. A television signal is sampled at a rate of 25% above the Nyquist rate. The signal has a bandwidth of 6 MHz. The samples are quantized into 512 levels. The minimum bandwidth required to transmit this signal would be—

1. 1. 135M bits/sec
      

   
   
   

   2. 67.5 M bits/sec
      

   
   
   

   3. 270 M bits/sec
      

   
   
   

   4. None of these.
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given that f_m = 6MHz
   f_s = 2f_m + 25 % of 2f_m
   

   fs = 12MHz +	25 × 12	MHz
   	100

   
   f_s = 15MHz
   and
   L = 2ⁿ = 512
   n = 9
   BW = nf_s = 15 × 9 MHz = 135 MHz

   Correct Option: A

   Given that f_m = 6MHz
   f_s = 2f_m + 25 % of 2f_m
   

   fs = 12MHz +	25 × 12	MHz
   	100

   
   f_s = 15MHz
   and
   L = 2ⁿ = 512
   n = 9
   BW = nf_s = 15 × 9 MHz = 135 MHz

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204. In ASK, the transmission bandwidth is equal to—
     

1. 1. Baseband bandwidth
      

   
   
   

   2. Twice baseband bandwidth
      

   
   
   

   3. Four times baseband bandwidth
      

   
   
   

   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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205. In contrast to analog transmission, digital system can employ—
     

1. 1. Regeneration
      

   
   
   

   2. Error control coding
      

   
   
   

   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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