1. The primary function of an Analog-to-Digital Converter (ADC) is to:
A. Convert a digital signal to an analog signal
B. Convert an analog signal to a digital signal
C. Amplify an analog signal
D. Store digital data
Answer: B. Convert an analog signal to a digital signal
2. In an ADC, the process of converting a continuous analog signal into a digital signal involves:
A. Quantization
B. Amplification
C. Modulation
D. Filtering
Answer: A. Quantization
3. Which of the following ADC types is the fastest?
A. Successive approximation ADC
B. Flash ADC
C. Delta-sigma ADC
D. Dual-slope ADC
Answer: B. Flash ADC
4. A 4-bit ADC can represent how many distinct output levels?
A. 8
B. 12
C. 16
D. 32
Answer: C. 16
5. In an ADC, what does the term “resolution” refer to?
A. The number of input signals
B. The number of bits in the digital output
C. The conversion speed of the ADC
D. The range of analog signals
Answer: B. The number of bits in the digital output
6. Which of the following is a disadvantage of a flash ADC?
A. It has low resolution
B. It is slow
C. It requires many comparators
D. It is prone to noise interference
Answer: C. It requires many comparators
7. What is the primary advantage of a delta-sigma ADC?
A. High speed
B. High resolution
C. Low power consumption
D. Simple architecture
Answer: B. High resolution
8. In a Successive Approximation ADC, the analog signal is compared to a:
A. Digital reference signal
B. Voltage ramp
C. Continuous sine wave
D. Successively increasing input
Answer: A. Digital reference signal
9. The sampling rate of an ADC should be at least twice the highest frequency of the input signal according to which theorem?
A. Nyquist-Shannon sampling theorem
B. Nyquist theorem
C. Fourier sampling theorem
D. Shannon-Kotelnikov theorem
Answer: A. Nyquist-Shannon sampling theorem
10. In a 10-bit ADC, the digital output range is from:
A. 0 to 10
B. 0 to 1023
C. 0 to 1000
D. 0 to 256
Answer: B. 0 to 1023
11. The primary function of a Digital-to-Analog Converter (DAC) is to:
A. Convert an analog signal to a digital signal
B. Convert a digital signal to an analog signal
C. Amplify an analog signal
D. Store analog data
Answer: B. Convert a digital signal to an analog signal
12. Which of the following DAC types is known for its simplicity and low cost?
A. R-2R ladder DAC
B. Delta-sigma DAC
C. Binary-weighted DAC
D. Inverted DAC
Answer: A. R-2R ladder DAC
13. In a binary-weighted DAC, each resistor value is based on:
A. The binary value of the input
B. The frequency of the input signal
C. The voltage range of the DAC
D. The number of bits in the output
Answer: A. The binary value of the input
14. In a 4-bit DAC, the output voltage will be proportional to:
A. 2^4
B. 4
C. 2^4 – 1
D. The number of bits
Answer: C. 2^4 – 1
15. A 3-bit DAC has how many discrete output levels?
A. 3
B. 6
C. 7
D. 8
Answer: D. 8
16. Which of the following is a major disadvantage of a binary-weighted DAC?
A. High complexity
B. Requires precision resistors
C. Low resolution
D. Slow conversion speed
Answer: B. Requires precision resistors
17. The resolution of a DAC is defined by the:
A. Number of output levels
B. Speed of conversion
C. Analog signal range
D. Input signal amplitude
Answer: A. Number of output levels
18. In an R-2R ladder DAC, the resistors used are:
A. All different values
B. Only two distinct values
C. Based on the binary input
D. Equal in value
Answer: B. Only two distinct values
19. The major advantage of a delta-sigma DAC is:
A. High accuracy and low distortion
B. Low cost
C. High speed
D. Simplicity of design
Answer: A. High accuracy and low distortion
20. The output of a DAC is a continuous analog signal that is proportional to:
A. The number of bits in the input
B. The frequency of the digital input signal
C. The binary value of the input signal
D. The clock speed of the DAC
Answer: C. The binary value of the input signal