46. Quantizing noise occurs in—
    

1. 1. Time-division multiplex
      

   
   
   

   2. Frequency-division multiplex
      

   
   
   

   3. Pulse-code modulation
      

   
   
   

   4. Pulse-width modulation

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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47. Indicate which of the following systems is digital?
    

1. 1. Pulse-position modulation
      

   
   
   

   2. Pulse-code modulation
      

   
   
   

   3. Pulse-width modulation
      

   
   
   

   4. Pulse-frequency modulation

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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48. Pulse-width modulation may be generated—
    

1. 1. By differentiating pulse-position modulation
      

   
   
   

   2. With a monostable multivibrator
      

   
   
   

   3. By integrating the signal
      

   
   
   

   4. With a free-running multivibrator

   
   
   

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1. View Hint View Answer Discuss in Forum

   Pulse-width modulation may be generated with a monostable multivibrator.

   Correct Option: B

   Pulse-width modulation may be generated with a monostable multivibrator.

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49. The most common modulation system used for telegraphy is—
    

1. 1. Frequency-shift keying
      

   
   
   

   2. Two-tone modulation
      

   
   
   

   3. Pulse-code modulation
      

   
   
   

   4. Single-tone modulation

   
   
   

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1. View Hint View Answer Discuss in Forum

   The most common modulation system used for telegraphy is frequency-shift keying.

   Correct Option: A

   The most common modulation system used for telegraphy is frequency-shift keying.

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