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- Question
The power dissipation, PD, of a logic gate is the product of the ________.
Options- A. dc supply voltage and the peak current
- B. dc supply voltage and the average supply current
- C. ac supply voltage and the peak current
- D. ac supply voltage and the average supply current
- Correct Answer
- dc supply voltage and the average supply current
- 1. What is the indication of a short on the input of a load gate?
Options- A. Only the output of the defective gate is affected.
- B. There is a signal loss to all gates on the node.
- C. The affected node will be stuck in the LOW state.
- D. There is a signal loss to all gates on the node, and the affected node will be stuck in the LOW state. Discuss
- 2. As a general rule for stable flip-flop triggering, the clock pulse rise and fall times must be:
Options- A. very long.
- B. very short.
- C. at a maximum value to enable the input control signals to stabilize.
- D. of no consequence as long as the levels are within the determinate range of value. Discuss
- 3. An input which can only be accepted when an enable or trigger is present is called asynchronous.
Options- A. True
- B. False Discuss
- 4. For each bit that is added to a digital ramp ADC, the conversion time ________.
Options- A. doubles
- B. triples
- C. decreases by one-third
- D. decreases by one-half Discuss
- 5. Which of the following statements best describes the operation of a synchronous up-/down-counter?
Options- A. The counter can count in either direction, but must continue in that direction once started.
- B. The counter can be reversed, but must be reset before counting in the other direction.
- C. In general, the counter can be reversed at any point in its counting sequence.
- D. The count sequence cannot be reversed, once it has begun, without first resetting the counter to zero. Discuss
- 6. The area represented by #4 in the given figure is the ________ level.
Options- A. HIGH
- B. LOW
- C. off
- D. unacceptable Discuss
- 7. If [A] = 10 and [B] = 01, then [A] + [B] = [ ].
Options- A. True
- B. False Discuss
- 8. When is a level-shifter circuit needed in interfacing logic?
Options- A. A level shifter is always needed.
- B. A level shifter is never needed.
- C. when the supply voltages are the same
- D. when the supply voltages are different Discuss
- 9. What control signals may be necessary to operate a 1-line-to-16 line decoder?
Options- A. flasher circuit control signal
- B. a LOW on all gate enable inputs
- C. input from a hexadecimal counter
- D. a HIGH on all gate enable circuits Discuss
- 10. In VHDL, local signals are declared in the VARIABLE section, which is placed between the SUBDESIGN section and the logic section.
Options- A. True
- B. False Discuss
More questions
Correct Answer: There is a signal loss to all gates on the node, and the affected node will be stuck in the LOW state.
Correct Answer: very short.
Correct Answer: False
Correct Answer: doubles
Correct Answer: In general, the counter can be reversed at any point in its counting sequence.
Correct Answer: unacceptable
Correct Answer: False
Correct Answer: when the supply voltages are different
Correct Answer: a LOW on all gate enable inputs
Correct Answer: False
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