Logic Gates problems
- 1. A clock signal with a period of 1 µs is applied to the input of an enable gate. The output must contain six pulses. How long must the enable pulse be active?
Options- A. Enable must be active for 0 µs.
- B. Enable must be active for 3 µs.
- C. Enable must be active for 6 µs.
- D. Enable must be active for 12 µs. Discuss
Correct Answer: Enable must be active for 6 µs.
- 2. The logic expression for a NOR gate is ________.
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 3. What is the difference between a 7400 and a 7411 IC?
Options- A. 7400 has two four-input NAND gates; 7411 has three three-input AND gates
- B. 7400 has four two-input NAND gates; 7411 has three three-input AND gates
- C. 7400 has two four-input AND gates; 7411 has three three-input NAND gates
- D. 7400 has four two-input AND gates; 7411 has three three-input NAND gates Discuss
Correct Answer: 7400 has four two-input NAND gates; 7411 has three three-input AND gates
- 4. How many input combinations would a truth table have for a six-input AND gate?
Options- A. 32
- B. 48
- C. 64
- D. 128 Discuss
Correct Answer: 64
- 5. The output of a NOT gate is HIGH when ________.
Options- A. the input is LOW
- B. the input is HIGH
- C. power is applied to the gate's IC
- D. power is removed from the gate's IC Discuss
Correct Answer: the input is LOW
- 6. TTL operates from a ________.
Options- A. 9-volt supply
- B. 3-volt supply
- C. 12-volt supply
- D. 5-volt supply Discuss
Correct Answer: 5-volt supply
- 7. Fan-out is specified in terms of ________.
Options- A. voltage
- B. current
- C. wattage
- D. unit loads Discuss
Correct Answer: unit loads
- 8. If a 3-input OR 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: 7
- 9. The output of a NOR gate is HIGH if ________.
Options- A. all inputs are HIGH
- B. any input is HIGH
- C. any input is LOW
- D. all inputs are LOW Discuss
Correct Answer: all inputs are LOW
- 10. The AND function can be used to ________ and the OR function can be used to ________ .
Options- A. enable, disable
- B. disable, enable
- C. enable or disable, enable or disable
- D. detect, invert Discuss
Correct Answer: enable or disable, enable or disable
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