DIRECTIONS: Read each question carefully. Then click on the dot next to the answer that most closely fits the question. Try to answer all questions on this quiz and when you are done, click on the grade me button at the bottom.

1. Which of the following is a pure D latch?

2. Which of the following cannot be the symbol for a clocked D latch?
   

3. Which of the following is the symbol for a flip-flop?
   
   

4. Which type of triggering does a latch use?

level triggering
edge triggering
either
neither

5. Why were D latches invented?

to make circuits smaller and simpler
to avoid the indeterminate state of the SR latch
to permit the inputs to be grouped into data and control wires
nobody really knows

6. In the following picture, all the wires have logic values on them. What happens when D changes to 1 and all the values propagate through the gates and stabilize?

Q will change to the value 1
CK will change to the value 1
nothing will change

7. What is the trade-off for replacing SR latches with D latches?

the circuits are more complex
the circuits have a longer time delay
the circuits will cost more
all of the above

8. Which type of memory cell uses the most gates?

latch
clocked latch
flip-flop

9. In the following picture of a flip-flop, the logic value 1 is currently stored in the flip-flop. What happens when CK changes its value?

Q changes to 0
Q stays at 1
can't tell because we don't know which edge triggers this flip-flop

10. Which of the following digital waveforms corresponds more accurately to real physics?