126. 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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127. 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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128. The counter which requires maximum number of flip-flop for a given MOD number is—
     

1. 1. Ripple counter
      

   
   
   

   2. BCD counter
      

   
   
   

   3. Ring counter
      

   
   
   

   4. Programmable counter
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   The ring counter requires maximum number of flipflop for a given MOD number.

   Correct Option: C

   The ring counter requires maximum number of flipflop for a given MOD number.

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129. The table which shows the necessary levels at J and K inputs to produce every possible flip-flop state transition is called—
     

1. 1. Truth table of JK flip-flop
      

   
   
   

   2. Excitation table of JK flip-flop
      

   
   
   

   3. Excitation table of MOD-N counter using JK flip-flop
      

   
   
   

   4. None of these
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   The excitation table of JK flip-flop shows the necessary levels at J and K inputs to produce every possible flip-flop state transition.

   Correct Option: B

   The excitation table of JK flip-flop shows the necessary levels at J and K inputs to produce every possible flip-flop state transition.

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130. A ring counter consist of five flip-flops will have—
     

1. 1. 5 states
      

   
   
   

   2. 10 states
      

   
   
   

   3. 32 states
      

   
   
   

   4. None of these
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   A ring counter consist of five flip-flops will have 5 states.

   Correct Option: A

   A ring counter consist of five flip-flops will have 5 states.

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