Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 44
Q901:
What is the function of the Cascade Logic in a Logic Element?
A. To cascade multiple LUTs
B. To store data
C. To amplify signals
D. To convert analog to digital
Correct Answer:
A
Chapter: 44
Q902:
What does the first Programmable Select in a Logic Element do?
A. Connects LUT output to a flip-flop input
B. Connects flip-flop output to LUT output
C. Connects LUT output to an external input
D. Connects flip-flop input to an external input
Correct Answer:
A
Chapter: 44
Q903:
What is the purpose of the Sample and Hold operation in an A/D converter?
A. To sample and hold analogue signals
B. To convert analogue signals to digital
C. To display analogue signals
D. To amplify analogue signals
Correct Answer:
A
Chapter: 44
Q904:
According to the Nyquist Criteria, what is the minimum sampling frequency required to accurately reconstruct a signal with a maximum frequency of 50 Hz?
A. 50 Hz
B. 75 Hz
C. 100 Hz
D. 200 Hz
Correct Answer:
C
Chapter: 44
Q905:
What happens if the sampled signal is held for too short a period?
A. The A/D converter will not work
B. The conversion will be inaccurate
C. The signal will be amplified
D. The signal will be distorted
Correct Answer:
B
Chapter: 44
Q906:
What is the purpose of quantization in A/D conversion?
A. To convert analogue signal to a digital format
B. To sample the analogue signal
C. To hold the analogue signal
D. To amplify the analogue signal
Correct Answer:
A
Chapter: 44
Q907:
How many quantization levels are represented by a 2-bit binary number?
A. 2
B. 4
C. 8
D. 16
Correct Answer:
B
Chapter: 44
Q908:
What is the effect of increasing the number of quantization levels in A/D conversion?
A. Decreases accuracy
B. Increases accuracy
C. Reduces processing time
D. Reduces data size
Correct Answer:
B
Chapter: 44
Q909:
In a Flash A/D converter, what does the priority encoder do?
A. Converts comparator outputs to binary
B. Converts analogue signal to voltage
C. Amplifies the analogue signal
D. Filters the analogue signal
Correct Answer:
A
Chapter: 44
Q910:
What is the main advantage of a Flash A/D converter compared to other types?
A. High-speed conversion
B. Low power consumption
C. Low cost
D. High accuracy
Correct Answer:
A
Chapter: 44
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
Correct Answer:
A
Chapter: 44
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
Correct Answer:
A
Chapter: 44
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
C
Chapter: 45
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
Correct Answer:
B
Chapter: 45
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
Correct Answer:
C
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
B
Chapter: 45
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
Correct Answer:
A