Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q911: How does a Dual-Slope A/D converter measure the analogue input voltage?
- A: By charging and discharging a capacitor
- B: By directly comparing analogue values
- C: By using a Flash A/D converter
- D: By integrating the analogue signal
View Answer
A
Q912: What is the primary drawback of a Dual-Slope A/D converter compared to a Flash A/D converter?
- A: Slower conversion speed
- B: Higher cost
- C: Higher power consumption
- D: Lower accuracy
View Answer
A
Q913: What is the role of the comparator in a Dual-Slope A/D converter?
- A: To compare the integrated signal with a reference voltage
- B: To sample the analogue signal
- C: To hold the analogue signal
- D: To amplify the analogue signal
View Answer
A
Q914: What is the primary function of a Successive-Approximation A/D Converter?
- A: Convert analogue signals to digital values
- B: Amplify analogue signals
- C: Store digital values
- D: Filter analogue signals
View Answer
A
Q915: Which component sets the most significant bit in a Successive-Approximation A/D Converter?
- A: Digital-to-Analogue Converter
- B: Comparator
- C: Successive Approximation Register (SAR)
- D: Parallel Binary Output
View Answer
C
Q916: What is the fixed conversion time characteristic of the Successive-Approximation A/D Converter compared to the Flash A/D Converter?
- A: Faster than the Flash Converter
- B: Slower than the Flash Converter
- C: Same as the Flash Converter
- D: Faster than Dual-Slope Converter
View Answer
B
Q917: How does the SAR initially set the bits for conversion in a 4-bit Successive-Approximation A/D Converter?
- A: zero
- B: 1111
- C: 1000
- D: 101
View Answer
C
Q918: What happens if the input signal is less than the output from the D/A converter during conversion?
- A: The SAR retains the bit and sets the next
- B: The SAR resets the bit and changes to a lower value
- C: The conversion process stops
- D: The output voltage increases
View Answer
A
Q919: Which type of error is caused by a bit stuck at a fixed logic value?
- A: Missing Code
- B: Incorrect Code
- C: Offset Error
- D: Quantization Error
View Answer
B
Q920: What does the Missing Code error represent in an A/D converter?
- A: A specific binary code is not outputted
- B: A fixed bit value affects the output
- C: An offset in the output voltage
- D: Inaccurate conversion due to comparator fault
View Answer
A