236. The number of unused states in a 4-bit Johnson counter is—
     

1. 1. 2
      

   
   
   

   2. 4
      

   
   
   

   3. 8
      

   
   
   

   4. 12

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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237. Minimum number of JK flip-flops are needed to construct a BCD counter is—
     

1. 1. 2
      

   
   
   

   2. 4
      

   
   
   

   3. 8
      

   
   
   

   4. 6
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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238. The minimum number of flip-flops required to construct a MOD-64 (divide by 64) ripple counter, are—
     

1. 1. 4 flip-flops
      

   
   
   

   2. 6 flip-flops
      

   
   
   

   3. 16 flip-flops
      

   
   
   

   4. 64 flip-flops
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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239. The maximum frequency at which a MOD-16 ripple counter using four JK flip-flops with propagation delay time of 50 ns is—
     

1. 1. 4 MHz
      

   
   
   

   2. 5 MHz
      

   
   
   

   3. 3.2 MHz
      

   
   
   

   4. 320 MHz

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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240. The type of register, in which data is entered into it only one bit at a time, but has all data bits available as output, is—
     

1. 1. Serial in/parallel out register
      

   
   
   

   2. Serial in/serial out register
      

   
   
   

   3. Parallel in/serial out register
      

   
   
   

   4. Parallel in/parallel out register.
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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