Logic Gates problems
- 1. The logic gate that will have a LOW output when any one of its inputs is HIGH is the:
Options- A. NAND gate
- B. AND gate
- C. NOR gate
- D. OR gate Discuss
Correct Answer: NOR gate
- 2. A logic probe is again applied to the pins of a 7421 IC with the following results. Is there a problem with the circuit and if so, what is the problem?
Options- A. Pin 6 should be ON.
- B. Pin 8 should be ON.
- C. Pin 8 should be pulsing.
- D. no problem Discuss
Correct Answer: no problem
- 3. The basic types of programmable arrays are made up of ________.
Options- A. AND gates
- B. OR gates
- C. NAND and NOR gates
- D. AND gates and OR gates Discuss
Correct Answer: AND gates and OR gates
- 4. The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
Options- A. Boolean constant
- B. Boolean variable
- C. truth table
- D. input logic function Discuss
Correct Answer: truth table
- 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
Correct Answer: 1
- 6. 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
Correct Answer: all four inputs
- 7. 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
Correct Answer: NOR
- 8. How many inputs are on the logic gates of a 74HC21 IC?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 4
- 9. 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
Correct Answer: less power than a TTL IC
- 10. 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 Discuss
Correct Answer: A = 0, B = 0, C = 0
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