Copyright © Dean Johnson 2008 (johnson@wmich.edu)

Quiz#10 Important Sequential Circuits

This quiz tests your knowledge of important types of SLC circuits (such as data-latch registers, shift registers,synchronous counters and ripplecounters) and their characteristic architectures. (Go back to homepage.)


  1. The sequential logic circuit shown represents most closely the basic architecture of a:

    1. Data-latch register
    2. Ripple counter
    3. Synchronous counter
    4. Shift register
    5. Up/Down counter





  2. What are the contents of the shift register shown below (assumed initially cleared) after the input sequence SI = 101111 is applied? (Assume 6 clock pulses are used).

    1. 0011
    2. 0010
    3. 1111
    4. 1011
    5. 1101

  3. Suppose that Q1 = 0 and Q2 = 1 is the initial state of the two JK flip-flop circuit shown. What is the state of the circuit after applying two complete clock pulses?

    1. Q1=0 Q2=0
    2. Q1=0 Q2=1
    3. Q1=1 Q2=0
    4. Q1=1 Q2=1




  4. Which of the waveforms shown below can be generated by the output QB of the synchronous counter shown? (QA is least significant)



      
        CLOCK _-__-__-__-__-__-__-__-__-__-__-__-__-__-__-__-__-_ 
          QB1 __---------_________---------_________---------____ 
          QB2 __---___---___---___---___---___---___---___---___- 
          QB3 __------------____________------------____________- 
          QB4 __------______------______------______------______- 
          QB5 __------------------------________________________- 
     

    1. QB1
    2. QB2
    3. QB3
    4. QB4
    5. QB5

  5. Suppose that Q1 = 1 and Q2 = 0 is the initial state of the two JK flip-flop circuit shown. What is the state of the circuit after applying two complete clock pulses?

    1. Q1=0 Q2=0
    2. Q1=0 Q2=1
    3. Q1=1 Q2=0
    4. Q1=1 Q2=1




  6. Which of the following represent the corrrect transient states which exist between the two ripple counter states shown below?
          (0011)
            |
            V 
          (????)  transient state #1 
            | 
            V 
          (????)  transient state #2 
            | 
            V 
          (0100) 
    

    1. 0001 0010
    2. 0000 0010
    3. 0110 0101
    4. 0010 0000
    5. 1000 1001

  7. If QDQCQBQA = 1011 initially, what are the contents of the shift register below after the input sequence SI = 01 is applied? (Assume 2 clock pulses are used.)

    1. 1101
    2. 1001
    3. 0110
    4. 1110
    5. 0100

  8. How many transient states does a 4-bit ripple counter transit through between count = 7 and count = 8?

    1. one
    2. two
    3. three
    4. four
    5. five

  9. A binary ripple counter is connected as shown (QA is least significant). Which of the following state sequences does the counter naturally progress through? (ignore transient states)

    1. 0 to 15
    2. 0 to 9
    3. 0 to 6
    4. 0 to 4
    5. 0 to 1