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