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- Question
The output of an OR gate with three inputs, A, B, and C, is LOW when ________.
Options- A. A = 0, B = 0, C = 0
- B. A = 0, B = 0, C = 1
- C. A = 0, B = 1, C = 1
- D. all of the above
- Correct Answer
- A = 0, B = 0, C = 0
- 1. A CMOS IC operating from a 3-volt supply will consume ________.
Options- A. less power than a TTL IC
- B. more power than a TTL IC
- C. the same power as a TTL IC
- D. no power at all Discuss
- 2. How many inputs are on the logic gates of a 74HC21 IC?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 3. Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?
Options- A. NOR
- B. NOT
- C. NAND
- D. AND Discuss
- 4. How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?
Options- A. any one of the inputs
- B. any two of the inputs
- C. any three of the inputs
- D. all four inputs Discuss
- 5. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Options- A. 1
- B. 2
- C. 7
- D. 8 Discuss
- 6. What is the name of a digital circuit that produces several repetitive digital waveforms?
Options- A. an inverter
- B. an OR gate
- C. a Johnson shift counter
- D. an AND gate Discuss
- 7. The basic logic gate whose output is the complement of the input is the:
Options- A. OR gate
- B. AND gate
- C. inverter
- D. comparator Discuss
- 8. How many truth table entries are necessary for a four-input circuit?
Options- A. 4
- B. 8
- C. 12
- D. 16 Discuss
- 9. 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 Discuss
- 10. The switching speed of CMOS is now ________.
Options- A. competitive with TTL
- B. three times that of TTL
- C. slower than TTL
- D. twice that of TTL Discuss
Logic Gates problems
Search Results
Correct Answer: less power than a TTL IC
Correct Answer: 4
Correct Answer: NOR
Correct Answer: all four inputs
Correct Answer: 1
Correct Answer: a Johnson shift counter
Correct Answer: inverter
Correct Answer: 16
Correct Answer: dc supply voltage and the average supply current
Correct Answer: competitive with TTL
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