MCQOPTIONS
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MCQOPTIONS
This section includes 59 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assume that in a certain 4-bit weighted ladder DAC, the input representing the most significant bit is applied to a 20 k resistor. What is the size of the resistor that represents the least significant bit? |
| A. | 2.5 k |
| B. | 5 k |
| C. | 80 k |
| D. | 160 k |
| Answer» E. | |
| 2. |
If a DAC has a full-scale, or maximum, output of 12 V and accuracy of 0.1%, then the maximum error for any output voltage is ________. |
| A. | 12 V |
| B. | 120 mV |
| C. | 12 mV |
| D. | 0 V |
| Answer» D. 0 V | |
| 3. |
A binary-weighted-input digital-to-analog converter has a feedback resistor, R, of 12 k. If 50 A of current is through the resistor, voltage out of the circuit is ________. |
| A. | 0.6 V |
| B. | –0.6 V |
| C. | 0.1 V |
| D. | –0.1 V |
| Answer» C. 0.1 V | |
| 4. |
Which of the following is not possible when the signal is analog? |
| A. | Phase shifting |
| B. | Equalization |
| C. | Modulation |
| D. | Data compression |
| Answer» E. | |
| 5. |
What is the program that is used to speed the spectrum analysis process? |
| A. | DDFT |
| B. | FDFT |
| C. | FGPA |
| D. | Fast Fourier transforms |
| Answer» E. | |
| 6. |
What is the process of examining the frequency content of a signal? |
| A. | Signal decoding |
| B. | Spectrum analysis |
| C. | Signal analysis |
| D. | Data analysis |
| Answer» C. Signal analysis | |
| 7. |
Reduction in the number of binary words required to represent an analog signal is called ________ |
| A. | Undersampling |
| B. | Oversampling |
| C. | Data compression |
| D. | Data minimization |
| Answer» D. Data minimization | |
| 8. |
Selectivity in a DSP is better than its analog equivalent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
What is the reason for the need of high speed DSP? |
| A. | Less power consumption at higher speeds |
| B. | Better processing capabilities |
| C. | High sampling frequency |
| D. | Easily programmable |
| Answer» D. Easily programmable | |
| 10. |
Which type of architecture uses different storage space for program code and the data? |
| A. | Von Neumann architecture |
| B. | Harvard architecture |
| C. | Fragmented architecture |
| D. | Split cell architecture |
| Answer» C. Fragmented architecture | |
| 11. |
What is the accessibility limitation of only one data or instruction set at a time from the memory called? |
| A. | Von Neumann limitation |
| B. | Von Neumann limit |
| C. | Von Neumann speed |
| D. | Von Neumann bottleneck |
| Answer» E. | |
| 12. |
Who is credited with creating the stored program concept? |
| A. | John Von Neumann |
| B. | Larry Page |
| C. | Alan Turing |
| D. | Ken Thompson |
| Answer» B. Larry Page | |
| 13. |
What happens after the signal is passed through the analog to digital converter in a DSP? |
| A. | Changed back to analog |
| B. | Stored in a RAM |
| C. | Amplified |
| D. | Attenuated |
| Answer» C. Amplified | |
| 14. |
Any digital computer can be used for DSP. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
The number of data lines on the GPIB is ________. |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 16. |
The resolution of a DAC can be expressed as the ________. |
| A. | minimum output voltage |
| B. | number of bits that are converted to an analog output |
| C. | deviation of the output from a straight line |
| D. | difference between the expected and actual outputs |
| Answer» C. deviation of the output from a straight line | |
| 17. |
In a binary-weighted-input digital-to-analog converter, the values of the input resistors are chosen to be proportional to the binary weights of the corresponding input bits. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 18. |
The ADC0804 is an example of a successive-approximation ADC. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 19. |
Assume that in a certain 4-bit weighted ladder DAC, the input representing the most significant bit is applied to a 20 k resistor. What is the size of the resistor that represents the least significant bit? |
| A. | 2.5 k |
| B. | 5 k |
| C. | 80 k |
| D. | 160 k |
| Answer» E. | |
| 20. |
The flash converter is the fastest analog-to-digital conversion method. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 21. |
An ADC that uses an up/down counter (and other devices) to follow changes in the input analog signal is a ________. |
| A. | single-slope ramp converter |
| B. | dual-slope ramp converter |
| C. | successive-approximation converter |
| D. | tracking converter |
| Answer» E. | |
| 22. |
Incorrect codes are a form of output error for a DAC. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 23. |
A binary-weighted-input digital-to-analog converter has a feedback resistor, Rf, of 12 k. If 50 A of current is through the resistor, voltage out of the circuit is ________. |
| A. | 0.6 V |
| B. | –0.6 V |
| C. | 0.1 V |
| D. | –0.1 V |
| Answer» C. 0.1 V | |
| 24. |
The principal advantage of the three-wire handshake on the GPIB is that it ________. |
| A. | is faster than two-wire methods |
| B. | allows fast and slow listeners on the same bus |
| C. | can be used over very long distances |
| D. | is compatible with the RS232C standard |
| Answer» C. can be used over very long distances | |
| 25. |
A monotonicity error in a DAC will show up as an incorrect analog output ________. |
| A. | only for higher value inputs |
| B. | only for lower value inputs |
| C. | only for certain (scattered) inputs |
| D. | for all inputs |
| Answer» D. for all inputs | |
| 26. |
A binary-weighted-input digital-to-analog converter has an input resistor of 100 k. If the resistor is connected to a 5 V source, current through the resistor is ________. |
| A. | 50 mA |
| B. | 50 A |
| C. | 5 mA |
| D. | 500 A |
| Answer» C. 5 mA | |
| 27. |
Offset is the characteristic of a DAC defined by the absence of any incorrect step reversals. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 28. |
The resolution of a 6-bit DAC is ________. |
| A. | 0.63 |
| B. | 0.64 |
| C. | 0.159 |
| D. | 0.0159 |
| Answer» E. | |
| 29. |
Which is a typical application of digital signal processing? |
| A. | Noise elimination |
| B. | Music signal processing |
| C. | Image processing |
| D. | All of the above |
| Answer» E. | |
| 30. |
Which A/D conversion method has a fixed conversion time? |
| A. | Single-slope analog-to-digital converter |
| B. | Dual-slope analog-to-digital converter |
| C. | Digital-ramp analog-to-digital converter |
| D. | Successive-approximation analog-to-digital converter |
| Answer» E. | |
| 31. |
Of the methods listed, the fastest A/D conversion is done by a ________. |
| A. | single-slope ramp converter |
| B. | dual-slope ramp converter |
| C. | successive-approximation converter |
| D. | tracking converter |
| Answer» D. tracking converter | |
| 32. |
In a digital representation of voltages using an 8-bit binary code, how many values can be defined? |
| A. | 16 |
| B. | 64 |
| C. | 128 |
| D. | 256 |
| Answer» E. | |
| 33. |
What do we call the manipulation of an analog signal in a digital domain? |
| A. | Analog-to-digital conversion |
| B. | Digital-to-analog conversion |
| C. | Digital signal processing |
| D. | Signal filtering |
| Answer» C. Digital signal processing | |
| 34. |
Digital signal processing must be at least half as fast as the incoming signal to be processed. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 35. |
In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________. |
| A. | 5 volts |
| B. | zero volts |
| C. | a voltage determined by the binary weighted input |
| D. | none of the above |
| Answer» C. a voltage determined by the binary weighted input | |
| 36. |
Digital filtering is faster than analog filtering. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 37. |
Which type of programming is typically used for digital signal processors? |
| A. | Assembly language |
| B. | Machine language |
| C. | C |
| D. | None of the above |
| Answer» B. Machine language | |
| 38. |
Settling time is normally defined as the time it takes a DAC to settle within ________. |
| A. | 1/8 LSB of its final value when a change occurs in the input code |
| B. | 1/4 LSB of its final value when a change occurs in the input code |
| C. | 1/2 LSB of its final value when a change occurs in the input code |
| D. | 1 LSB of its final value when a change occurs in the input code |
| Answer» D. 1 LSB of its final value when a change occurs in the input code | |
| 39. |
An ADC that compares each bit, one at a time, with the input analog signal is a ________. |
| A. | single-slope ramp converter |
| B. | dual-slope ramp converter |
| C. | successive-approximation converter |
| D. | tracking converter |
| Answer» D. tracking converter | |
| 40. |
Successive-approximation is perhaps the most widely used method of A/D conversion. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 41. |
Which is not an A/D conversion error? |
| A. | Differential nonlinearity |
| B. | Missing code |
| C. | Incorrect code |
| D. | Offset |
| Answer» B. Missing code | |
| 42. |
In a digital reproduction of an analog curve, accuracy can be increased by ________. |
| A. | sampling the curve more often |
| B. | sampling the curve less often |
| C. | decreasing the number of bits used to represent each sampled value |
| D. | all of the above |
| Answer» B. sampling the curve less often | |
| 43. |
A standard logic device can be connected on a bus system as an open-collector logic device by connecting each output to a ________. |
| A. | discrete transistor |
| B. | 10 k series resistor |
| C. | light-emitting diode |
| D. | CMOS buffer |
| Answer» B. 10 k series resistor | |
| 44. |
A 4-bit R/2R ladder digital-to-analog converter uses ________. |
| A. | one resistor value |
| B. | two resistor values |
| C. | three resistor values |
| D. | four resistor values |
| Answer» C. three resistor values | |
| 45. |
If a DAC has a full-scale, or maximum, output of 12 V and accuracy of 0.1%, then the maximum error for any output voltage is ________. |
| A. | 12 V |
| B. | 120 mV |
| C. | 12 mV |
| D. | 0 V |
| Answer» D. 0 V | |
| 46. |
The flash method of analog-to-digital conversion uses comparators that compare reference voltages with the analog input voltage. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 47. |
In troubleshooting a DAC, we check its performance characteristics, such as ________. |
| A. | nonmonotonicity |
| B. | differential nonlinearity |
| C. | low and high gain |
| D. | all of the above |
| Answer» E. | |
| 48. |
Which of the following best defines Nyquist frequency? |
| A. | The frequency of resonance for the filtering circuit |
| B. | The second harmonic |
| C. | The lower frequency limit of sampling |
| D. | The highest frequency component of a given analog signal |
| Answer» E. | |
| 49. |
For a 4-bit DAC, the least significant bit (LSB) is ________. |
| A. | 6.25% of full scale |
| B. | 0.625% of full scale |
| C. | 12% of full scale |
| D. | 1.2% of full scale |
| Answer» B. 0.625% of full scale | |
| 50. |
How are unwanted frequencies removed prior to digital conversion? |
| A. | Pre-filters |
| B. | Digital signal processing |
| C. | Sample-and-hold circuits |
| D. | All of the above |
| Answer» B. Digital signal processing | |