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
41. Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.
- very high voltage gain
- unlimited bandwidth
- a low slew rate
- very high current gain
42. Sample-and-hold circuits in A/D converters are designed to:
- sample and hold the output of the binary counter during the conversion process
- stabilize the comparator's threshold voltage during the conversion process
- stabilize the input analog signal during the conversion process
- sample and hold the D/A converter staircase waveform during the conversion process
43. What is the main disadvantage of the counter-ramp A/D converter?
- It requires a counter.
- The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
- It requires a precision clock in order for the conversion to be reliable.
- The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage. It requires a precision clock in order for the conversion to be reliable.
44. Why is a binary-weighted DAC usually limited to 4-bit binary conversion?
- too many pins on the IC
- too many op amps needed
- too many different values of capacitors
- too many different values of resistors
45. What is the resolution 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 deviation between the ideal straight-line output and the actual output of the converter.
- It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
46. An actuator is usually a device that:
- converts analog data to meaningful digital data.
- controls a physical variable.
- stores digital data and then processes that data according to a set of specified instructions.
- converts a physical variable to an electrical variable.
47. The DAC0808 and the MC1408 are very popular and inexpensive 8-bit D/A converters.
- TRUE
- FALSE
48. The delay between a change on the digital input of a DAC and the appearance of the change on the output is called settling time.
- TRUE
- FALSE
50. One way to determine the resolution of a DAC is to calculate the ratio of one step voltage to the maximum output voltage.
- TRUE
- FALSE