26. The band rate—
    

1. 1. Is always equal to the bit transfer rate
      

   
   
   

   2. Is equal to twice the bandwidth of an ideal channel
      

   
   
   

   3. Is not equal to the signalling rate
      

   
   
   

   4. Is equal to one-half the bandwidth of an ideal channel

   
   
   

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1. View Hint View Answer Discuss in Forum

   The band rate is equal to twice the bandwidth of an ideal channel.

   Correct Option: B

   The band rate is equal to twice the bandwidth of an ideal channel.

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27. The number of repeaters along a coaxial cable link depends on—
    

1. 1. Whether separate tubes are used for the two directions of transmission
      

   
   
   

   2. The bandwidth of the system
      

   
   
   

   3. The number of coaxial cables in the tube
      

   
   
   

   4. The separation of the equalizers

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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28. Time-division multiplex—
    

1. 1. Can be used with PCM only
      

   
   
   

   2. Combines five groups into a supergroup
      

   
   
   

   3. Stacks 24 channels in adjacent frequency slots
      

   
   
   

   4. Interleaves pulses belonging to different transmissions

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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29. A basic group B—
    

1. 1. Occupies the frequency range from 60 to 108 kHz
      

   
   
   

   2. Consists of erect channels only
      

   
   
   

   3. Is formed at the group translating equipment
      

   
   
   

   4. Consists of five supergroups

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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30. A scheme in which several channels are interleaved and then transmitted together is known as—
    

1. 1. Frequency-division multiplex
      

   
   
   

   2. Time-division multiplex
      

   
   
   

   3. A group
      

   
   
   

   4. A supergroup

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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