Digital Design problems
- 1. Define a race condition for a flip-flop.
Options- A. The inputs to a trigger device are changing slightly before the active trigger edge.
- B. The inputs to a trigger device are changing slightly after the active trigger edge.
- C. The inputs to a trigger device are changing at the same time as the active trigger edge. Discuss
Correct Answer: The inputs to a trigger device are changing at the same time as the active trigger edge.
- 2. Which of the following flip-flop timing parameters indicates the time it takes a Q output to respond to a Cp input?
Options- A. ts, th
- B. tPHL, tPLH
- C. tw (L), tw (H)
- D. fmax Discuss
Correct Answer: tPHL, tPLH
- 3. The main concern when using a pull-down resistor is:
Options- A. the low power dissipation of the resistor
- B. it will keep a floating terminal LOW
- C. the high power dissipation of the resistor
- D. it will cause false triggering Discuss
Correct Answer: the high power dissipation of the resistor
- 4. What is the major advantage of the J-K flip-flop over the S-R flip-flop?
Options- A. The J-K flip-flop is much faster.
- B. The J-K flip-flop does not have propagation delay problems.
- C. The J-K flip-flop has a toggle state.
- D. The J-K flip-flop has two outputs. Discuss
Correct Answer: The J-K flip-flop has a toggle state.
- 5. The ________ circuit overcomes the problem of switching caused by jitter on the inputs.
Options- A. astable multivibrator
- B. monostable multivibrator
- C. bistable multivibrator
- D. Schmitt trigger Discuss
Correct Answer: Schmitt trigger
- 6. The output of a standard TTL NAND gate is used to pull an LED indicator LOW. The LED is in series with a 470-Ω resistor. What is the current in the circuit when the LED is on?
Options- A. 7.02 mA
- B. 8.51 mA
- C. 10.63 mA
- D. 5.32 mA Discuss
Correct Answer: 7.02 mA
- 7. One example for the use of a Schmitt trigger is as a(n):
Options- A. switch debouncer
- B. racer
- C. astable oscillator
- D. transition pulse generator Discuss
Correct Answer: switch debouncer
- 8. When the inputs to a flip-flop are changing at the same time that the active trigger edge of the input clock is making its transition, this condition is called:
Options- A. racing
- B. toggling
- C. slave loading
- D. pulse timing Discuss
Correct Answer: racing
- 9. A series RC circuit can be used to generate a power-up (automatic) reset signal.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. A Schmitt trigger has a positive feedback circuit and experiences a phenomenon called hysteresis.
Options- A. True
- B. False Discuss
Correct Answer: False
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