21. Sequential circuits contains—

1. 1. No memory element

   
   
   

   2. Atleast one memory element

   
   
   

   3. All inputs applied simultaneously

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Sequential circuit contains at least one memory element.

   Correct Option: B

   Sequential circuit contains at least one memory element.

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22. In sequential circuit the output state depend upon—

1. 1. Past input states

   
   
   

   2. Present input states

   
   
   

   3. Present as well as past input

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   In sequential circuit the output state depends upon present as well as past input.

   Correct Option: C

   In sequential circuit the output state depends upon present as well as past input.

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23. A cascade arrangement of four stages of BCD counters can be used to count a maximum of—
    

1. 1. 1111 pulses
      

   
   
   

   2. 111111111111111 pulses
      

   
   
   

   3. 1001100110011001 pulses
      

   
   
   

   4. 9999 pulses

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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24. The decoding glitches are more likely to occur in the case of—
    

1. 1. Ripple counters
      

   
   
   

   2. Parallel counters
      

   
   
   

   3. Johnson counters
      

   
   
   

   4. Ring counters

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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25. The minimum number of flip-flops required to construct a MOD-10 Johnson counter and MOD 5 ring counter, respectively, are—
    

1. 1. 10, 5
      

   
   
   

   2. 5, 10
      

   
   
   

   3. 5, 5
      

   
   
   

   4. 10, 10

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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