Flip-Flops and Timers problems
- 1. The truth table for an S-R flip-flop has how many VALID entries?
Options- A. 3
- B. 1
- C. 4
- D. 2 Discuss
Correct Answer: 3
- 2. One example of the use of an S-R flip-flop is as a(n):
Options- A. transition pulse generator
- B. astable oscillator
- C. racer
- D. switch debouncer Discuss
Correct Answer: switch debouncer
- 3. The 555 timer can be used in which of the following configurations?
Options- A. astable, monostable
- B. monostable, bistable
- C. astable, toggled
- D. bistable, tristable Discuss
Correct Answer: astable, monostable
- 4. The equation for the output frequency of a 555 timer operating in the astable mode is:
.
What value of C1 will be required if R1 = 1 kΩ, R2 = 1 kΩ, and f = 1 kHz?
Options- A. 0.33 µF
- B. 0.48 µF
- C. 480 µF
- D. 33 nF Discuss
Correct Answer: 0.48 µF
- 5. What is one disadvantage of an S-R flip-flop?
Options- A. It has no Enable input.
- B. It has a RACE condition.
- C. It has no clock input.
- D. It has only a single output. Discuss
Correct Answer: It has a RACE condition.
- 6. An astable multivibrator is a circuit that:
Options- A. has two stable states
- B. is free-running
- C. produces a continuous output signal
- D. is free-running and produces a continuous output signal Discuss
Correct Answer: produces a continuous output signal
- 7. What is another name for a one-shot?
Options- A. monostable
- B. bistable
- C. astable
- D. tristable Discuss
Correct Answer: monostable
- 8. A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates?
Options- A. AND or OR gates
- B. XOR or XNOR gates
- C. NOR or NAND gates
- D. AND or NOR gates Discuss
Correct Answer: NOR or NAND gates
- 9. If both inputs of an S-R NAND latch are LOW, what will happen to the output?
Options- A. The output would become unpredictable.
- B. The output will toggle.
- C. The output will reset.
- D. No change will occur in the output. Discuss
Correct Answer: The output would become unpredictable.
- 10. What is the significance of the J and K terminals on the J-K flip-flop?
Options- A. There is no known significance in their designations.
- B. The J represents "jump," which is how the Q output reacts whenever the clock goes HIGH and the J input is also HIGH.
- C. The letters represent the initials of Johnson and King, the co-inventors of the J-K flip-flop.
- D. All of the other letters of the alphabet are already in use. Discuss
Correct Answer: There is no known significance in their designations.
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