11. The main advantage of DM over PCM is—
    

1. 1. Less bandwidth
      

   
   
   

   2. Less power
      

   
   
   

   3. Better S/N ratio
      

   
   
   

   4. Simple circuitry

   
   
   

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1. View Hint View Answer Discuss in Forum

   The main advantage of DM over PCM is simple circuitry.

   Correct Option: D

   The main advantage of DM over PCM is simple circuitry.

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12. Companding is used in PCM to—
    

1. 1. Reduce bandwidth
      

   
   
   

   2. Reduce power
      

   
   
   

   3. Increase S/N ratio
      

   
   
   

   4. Get almost uniform S/N ratio

   
   
   

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1. View Hint View Answer Discuss in Forum

   Companding is used in PCM to get almost uniform S/N ratio.

   Correct Option: D

   Companding is used in PCM to get almost uniform S/N ratio.

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13. Quantization noise occurs in—
    

1. 1. PAM
      

   
   
   

   2. PPM
      

   
   
   

   3. DM
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Quantization noise occurs in DM.

   Correct Option: C

   Quantization noise occurs in DM.

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14. A plot of modulation index versus carrier amplitude yields a—
    

1. 1. Horizontal line
      

   
   
   

   2. Vertical line
      

   
   
   

   3. Parabola
      

   
   
   

   4. Hyperbola

   
   
   

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1. View Hint View Answer Discuss in Forum

   A plot of modulation index versus carrier amplitude yields a hyperbola.

   Correct Option: D

   A plot of modulation index versus carrier amplitude yields a hyperbola.

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15. The resonant frequency of an RF amplifier is 1 MHz and its bandwidth is 10 kHz. The Q-factor will be—
    

1. 1. 10
      

   
   
   

   2. 100
      

   
   
   

   3. 0.01
      

   
   
   

   4. 0.1

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given,
   f_r = 1MHz = 1 × 10⁶ Hz
   BW = 10 KHz = 10 × 10³Hz
   We know that quality factor,

   Q =	Resonant frequency
   	Bandwidth

   
   

   Q =	fr	=	1 × 106	= 100
   	BW		10 × 103

   Correct Option: B

   Given,
   f_r = 1MHz = 1 × 10⁶ Hz
   BW = 10 KHz = 10 × 10³Hz
   We know that quality factor,

   Q =	Resonant frequency
   	Bandwidth

   
   

   Q =	fr	=	1 × 106	= 100
   	BW		10 × 103

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