Interfacing to the Analog World Questions and Answers
Interfacing to the Analog World is a crucial electronics concept covered in programming questions and answers for GATE, DRDO, and ISRO technical exams. This topic explains how analog signals are converted and processed using digital systems through sensors, ADCs, DACs, and amplifiers. Understanding analog-digital interfacing is vital for embedded system design and real-time control applications. By practicing MCQs and solving real-world interfacing problems, candidates can develop a practical understanding of hardware communication essential for technical interview preparation and electronic system design projects.
Interfacing to the Analog World
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85 questions
21. Which of the following characterizes an analog quantity?
- Discrete levels represent changes in a quantity.
- Its values follow a logarithmic curve.
- It can be described with a finite number of steps.
- It has a continuous set of values over a given range.
22. A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and maximum input voltage of 10 V.
- The maximum number of samples per second will be 6250.
- The maximum sample rate will be 100,000 samples/second.
- The minimum sample rate will be 6250 samples/second.
- The minimum sample rate will be 100,000 samples/second.
23. What is the accuracy of a D/A converter?
- It is the reciprocal of the number of discrete steps in the D/A output.
- It is the comparison between the actual output of the converter and its expected output.
- It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
- It is the deviation between the ideal straight-line output and the actual output of the converter.
24. An analog quantity varies from 0–7 V and is input to a 6-bit A/D converter. What analog value is represented by each step on the digital output?
- 0.111 V
- 1.17 V
- 0.109 V
- 0.857 V
25. Inaccurate A/D conversion may be due to:
- constant analog input voltage
- linear ramp usage
- intermittent counter inputs
- faulty sample-and-hold circuitry
26. What is the resolution, in percent, of a 12-bit DAC?
- 8.33
- 0.049
- 0.000488
- 0.083
27. What circuitry is on an ADC0808 IC?
- A multiplexer
- An ADC
- A 3-bit select input code
- All of the above
28. What is the maximum conversion time for an 8-bit successive-approximation ADC with a clock frequency of 20 kHz?
- 12.8 ms
- 6.4 ms
- 0.05 ms
- 0.4 ms
29. What is one advantage to using a parallel-encoded (flash) ADC?
- less expensive
- very fast conversion
- less complicated circuit
30. If the same analog signal is to be converted to an 8-bit resolution using a counter-ramp ADC, how many comparator circuits would be used?
- 1
- 8
- 127
- 255