Counters problems
- 1. What is the difference between a 7490 and a 7492?
Options- A. 7490 is a MOD-12, 7492 is a MOD-10
- B. 7490 is a MOD-12, 7492 is a MOD-16
- C. 7490 is a MOD-16, 7492 is a MOD-10
- D. 7490 is a MOD-10, 7492 is a MOD-12 Discuss
Correct Answer: 7490 is a MOD-10, 7492 is a MOD-12
- 2. List the state of each output pin of a 7447 if RBI = 0, LT = 1, A0 = 1, A1 = 0, A2 = 0, and A3 = 1.
Options- A. RBO = 0, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
- B. RBO = 1, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
- C. RBO = 0, a = 0, b = 0, c = 0, d = 0, e = 1, f = 0, g = 0
- D. RBO = 1, a = 0, b = 0, c = 0, d = 0, e = 1, f = 0, g = 0 Discuss
Correct Answer: RBO = 0, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
- 3. The hexadecimal equivalent of 15,536 is ________.
Options- A. 3CB0
- B. 3C66
- C. 63C0
- D. 6300 Discuss
Correct Answer: 3CB0
- 4. Referring to the given figure, at which point is the serial data transferred to the parallel output?
Options- A. W
- B. X
- C. Y
- D. Z Discuss
Correct Answer: Z
- 5. Three cascaded decade counters will divide the input frequency by ________.
Options- A. 10
- B. 20
- C. 100
- D. 1,000 Discuss
Correct Answer: 1,000
- 6. The terminal count of a 3-bit binary counter in the DOWN mode is ________.
Options- A. 000
- B. 111
- C. 101
- D. 010 Discuss
Correct Answer: 000
- 7. For a one-shot application, how can HDL code be used to make a circuit respond once to each positive transition on its trigger input?
Options- A. By using a counter
- B. By using an active clock
- C. By using an immediate reload
- D. By using edge trapping Discuss
Correct Answer: By using edge trapping
- 8. One of the major drawbacks to the use of asynchronous counters is:
Options- A. low-frequency applications are limited because of internal propagation delays
- B. high-frequency applications are limited because of internal propagation delays
- C. asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications
- D. asynchronous counters do not have propagation delays and this limits their use in high-frequency applications Discuss
Correct Answer: high-frequency applications are limited because of internal propagation delays
- 9. When two counters are cascaded, the overall MOD number is equal to the ________ of their individual MOD numbers.
Options- A. product
- B. sum
- C. log
- D. reciprocal Discuss
Correct Answer: product
- 10. A 4-bit ripple counter consists of flip-flops, which each have a propagation delay from clock to Q output of 15 ns. For the counter to recycle from 1111 to 0000, it takes a total of ________.
Options- A. 15 ns
- B. 30 ns
- C. 45 ns
- D. 60 ns Discuss
Correct Answer: 60 ns
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