Digital Circuits Practice Test 7

1. In digital logic, a counter is a device which ____________

Stores the number of times a particular event or process has occurred

Counts the number of outputs

Stores the number of times a clock pulse rises and falls

Counts the number of inputs

2. A reliable method for eliminating decoder spikes is the technique called ________

Feeding

Strobing

Waving

Wagging

3. How many natural states will there be in a 4-bit ripple counter?

4. How many different states does a 2-bit asynchronous counter have?

5. Three cascaded decade counters will divide the input frequency by ____________

1000

100

6. In a 3-bit asynchronous down counter, the initial content is ____________

000

111

010

101

7. A 5-bit asynchronous binary counter is made up of five flip-flops, each with a 12 ns propagation delay. The total propagation delay (tp(total)) is ____________

48 ns

60 ns

12 ms

24 ns

8. Modulus refers to ____________

The maximum number of states in a counter sequence

The modulus of elasticity, or the ability of a circuit to be stretched from one mode to another

An input on a counter that is used to set the counter state, such as UP/DOWN

A method used to fabricate decade counter units

9. For realisation of SR flip-flop from JK flip-flop, the excitation input will be obtained from ___________

J and K input

S and R

D input

R input

10. One of the major drawbacks to the use of asynchronous counters is that ____________

High-frequency applications are limited because of internal propagation delays

Low-frequency applications are limited because of internal propagation delays

Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications

Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications