Discussion
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- Question
The output of a gated S-R flip-flop changes only if the:
Options- A. flip-flop is set
- B. control input data has changed
- C. flip-flop is reset
- D. input data has no change
- Correct Answer
- control input data has changed
- 1. A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:
Options- A. clock is LOW
- B. slave is transferring
- C. flip-flop is reset
- D. clock is HIGH Discuss
- 2. A push-button switch is used to input data to a register. The output of the register is erratic. What could be causing the problem?
Options- A. The power supply is probably noisy.
- B. The switch contacts are bouncing.
- C. The socket contacts on the register IC are corroded.
- D. The register IC is intermittent and failure is imminent. Discuss
- 3. What is one disadvantage of an S-R flip-flop?
Options- A. It has no enable input.
- B. It has an invalid state.
- C. It has no clock input.
- D. It has only a single output. Discuss
- 4. Which of the following is correct for a gated D flip-flop?
Options- A. The output toggles if one of the inputs is held HIGH.
- B. Only one of the inputs can be HIGH at a time.
- C. The output complement follows the input when enabled.
- D. Q output follows the input D when the enable is HIGH. Discuss
- 5. If an input is activated by a signal transition, it is ________.
Options- A. edge-triggered
- B. toggle triggered
- C. clock triggered
- D. noise triggered Discuss
- 6. The toggle condition in a master-slave J-K flip-flop means that Q and
will switch to their ________ state(s) at the ________.
Options- A. opposite, active clock edge
- B. inverted, positive clock edge
- C. quiescent, negative clock edge
- D. reset, synchronous clock edge Discuss
- 7. Which is not an Altera primitive port identifier?
Options- A. clk
- B. ena
- C. clr
- D. prn Discuss
- 8. 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
- 9. 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
- 10. The hexadecimal equivalent of 15,536 is ________.
Options- A. 3CB0
- B. 3C66
- C. 63C0
- D. 6300 Discuss
Flip-Flops problems
Search Results
Correct Answer: clock is HIGH
Correct Answer: The switch contacts are bouncing.
Correct Answer: It has an invalid state.
Correct Answer: Q output follows the input D when the enable is HIGH.
Correct Answer: edge-triggered
Correct Answer: opposite, active clock edge
Correct Answer: clr
Correct Answer: 7490 is a MOD-10, 7492 is a MOD-12
Correct Answer: RBO = 0, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
Correct Answer: 3CB0
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