Asynchronous Down Counter MCQ’s

Digital Circuits Electronics & Communication Engineering

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Asynchronous Down Counter”.

1. A down counter using n-flip-flops count ______________
a) Downward from a maximum count
b) Upward from a minimum count
c) Downward from a minimum to maximum count
d) Toggles between Up and Down count

2. UP Counter is ____________
a) It counts in upward manner
b) It count in down ward manner
c) It counts in both the direction
d) Toggles between Up and Down count

3. Which of the following statements are true?
a) Asynchronous events does not occur at the same time
b) Asynchronous events are controlled by a clock
c) Synchronous events does not need a clock to control them
d) Only asynchronous events need a control clock

4. DOWN counter is ____________
a) It counts in upward manner
b) It count in downward manner
c) It counts in both the direction
d) Toggles between Up and Down count

5. In a down counter, which flip-flop doesn’t toggle when the inverted output of the preceeding flip-flop goes from HIGH to LOW.
a) MSB flip-flop
b) LSB flip-flop
c) Master slave flip-flop
d) Latch

6. In a 3-bit asynchronous down counter, at the first negative transition of the clock, the counter content becomes ____________
a) 000
b) 111
c) 101
d) 010

7. How many different states does a 3-bit asynchronous down counter have?
a) 2
b) 4
c) 6
d) 8

8. In a 3-bit asynchronous down counter, the initial content is ____________
a) 000
b) 111
c) 010
d) 101

9. In a 3-bit asynchronous down counter, at the first negative transition of the clock, the counter content becomes ____________
a) 000
b) 111
c) 101
d) 010

10. In order to check the CLR function of a counter ____________
a) Apply the active level to the CLR input and check all of the Q outputs to see if they are all in their reset state
b) Ground the CLR input and check to be sure that all of the Q outputs are LOW
c) Connect the CLR input to Vcc and check to see if all of the Q outputs are HIGH
d) Connect the CLR to its correct active level while clocking the counter; check to make sure that all of the Q outputs are toggling

11. The hexadecimal equivalent of 15,536 is ________
a) 3CB0
b) 3C66
c) 63C0
d) 6300

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