Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q251: How does the output of an XOR gate change when an additional input is added to a 2-input XOR gate?
- A: It remains the same
- B: It becomes a 3-input XOR gate
- C: It becomes a XNOR gate
- D: It turns into a NOR gate
View Answer
B
Q252: How is a NOT gate implemented using TTL technology?
- A: Using a BJT
- B: Using a MOSFET
- C: Using a combination of MOSFETs
- D: Using a combination of BJTs
View Answer
A
Q253: What is the typical supply voltage for TTL-based devices?
- A: +3.3V
- B: +5V
- C: +12V
- D: +15V
View Answer
B
Q254: Which TTL series has the fastest switching speed and lowest power consumption?
- A: 74 Standard TTL
- B: 74LS Low-Power Schottky TTL
- C: 74F Fast TTL
- D: 74ALS Advanced Low-Power Schottky TTL
View Answer
D
Q255: What is the input voltage range for a logic high signal in TTL?
- A: 0 to 0.8V
- B: 2 to 5V
- C: 0 to 2V
- D: 2.4 to 5V
View Answer
B
Q256: What is the minimum acceptable input voltage for a logic high signal in CMOS 5V series?
- A: 3.0V
- B: 3.5V
- C: 4.0V
- D: 4.4V
View Answer
B
Q257: What is the output voltage range for a logic low signal in TTL?
- A: 0 to 0.4V
- B: 0 to 0.8V
- C: 0.4 to 0.8V
- D: 2.4 to 5V
View Answer
A
Q258: What is the noise margin high (VNH) for CMOS 5 volt series?
- A: 0.4V
- B: 0.9V
- C: 1.17V
- D: 2.0V
View Answer
B
Q259: What is the power dissipation of a TTL gate when operating at logic high state?
- A: 1.5 mA
- B: 2.0 mA
- C: 3.0 mA
- D: 4.0 mA
View Answer
A
Q260: How does the power dissipation in CMOS devices change with frequency?
- A: It decreases
- B: It remains constant
- C: It increases
- D: It decreases initially then increases
View Answer
C