Flip-Flops and Timers problems
- 1. Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?
Options- A. asynchronous operation
- B. low input voltages
- C. gate impedance
- D. cross coupling Discuss
Correct Answer: cross coupling
- 2. Which of the following is correct for a gated D-type flip-flop?
Options- A. The Q output is either SET or RESET as soon as the D input goes HIGH or LOW.
- B. The output complement follows the input when enabled.
- C. Only one of the inputs can be HIGH at a time.
- D. The output toggles if one of the inputs is held HIGH. Discuss
Correct Answer: The Q output is either SET or RESET as soon as the D input goes HIGH or LOW.
- 3. Which of the following describes the operation of a positive edge-triggered D-type flip-flop?
Options- A. If both inputs are HIGH, the output will toggle.
- B. The output will follow the input on the leading edge of the clock.
- C. When both inputs are LOW, an invalid state exists.
- D. The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock. Discuss
Correct Answer: The output will follow the input on the leading edge of the clock.
- 4. When both inputs of a J-K flip-flop cycle, the output will:
Options- A. be invalid
- B. not change
- C. change
- D. toggle Discuss
Correct Answer: not change
- 5. Multivibrators must be level-triggered.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. When using master-slave flip-flops, the data is entered into the flip-flop on the leading edge of the clock, but the output does not change until the trailing edge of the clock.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. Pulse-triggered flip-flops are identified by a bubble on the Q output terminal.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. Edge-triggered flip-flops can be identified by the triangle on the clock input.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. The 555 timer can be used in either the bistable mode or the monostable mode.
Options- A. True
- B. False Discuss
Correct Answer: False
- 10. A one-shot is a special type of multivibrator, which must be triggered to produce each output pulse.
Options- A. True
- B. False Discuss
Correct Answer: True
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