MCQOPTIONS
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MCQOPTIONS
This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Signal Processing knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In DM, By increasing Δ, reduces the overload distortion but increases the granular noise, and vice versa. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The slope-overload distortion is avoided, if which of the following conditions satisfy? |
| A. | Min|dx(t)/d(t)| ≤ Δ/T |
| B. | Max|dx(t)/d(t)| ≤ Δ/T |
| C. | |dx(t)/d(t)| ≤Δ/T |
| D. | None of the mentioned |
| Answer» C. |dx(t)/d(t)| ≤Δ/T | |
| 3. |
The crosshatched areas gives two types of Quantization error in DM, they are? |
| A. | Slope-overload distortion |
| B. | Granular noise |
| C. | Slope-overload distortion & Granular noise |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
If the interpolation factor is I = 256, the A/D converter output can be obtained by averaging successive non-overlapping blocks of 128 bits. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
The noise power σn2 can be reduced by increasing the sampling rate to spread the quantization noise power over a larger frequency band (-Fs/2, Fs/2). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
In the practical A/D converters, what are the distortions and time-related degradations occur during the conversion process? |
| A. | Jitter errors |
| B. | Droops |
| C. | Nonlinear variations in the duration of the sampling aperture |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
The S/H is a digitally controlled analog circuit that tracks the analog input signal during the sample mode and then holds it fixed during the hold mode to the instantaneous value of the signal at the time the system is switched from the sample to the hold mode. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
For a given sample-and-hold circuit, if the value of the hold capacitor is increased, then |
| A. | droop rate decreases and acquisition time decreases |
| B. | droop rate decreases and acquisition time increases |
| C. | droop rate increases and acquisition time decreases |
| D. | droop rate increases and acquisition time increases |
| Answer» C. droop rate increases and acquisition time decreases | |
| 9. |
Figure shows 4 block diagram of a system to recover a sampled signal shown as input.Blocks A and B can be respectively : |
| A. | Zero order hold and low pass filter |
| B. | Multiplier and high pass filter |
| C. | Envelop detector and sampler |
| D. | Tuned circuit and mixer |
| Answer» B. Multiplier and high pass filter | |
| 10. |
A good Sample and Hold circuit should have1. High input impedance2. High output impedance3. Low input impedance 4. Low output impedance |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 3 and 4 only |
| D. | 1 and 4 only |
| Answer» E. | |
| 11. |
Increase the order of data hold will |
| A. | improve the stability of the system |
| B. | decrease the time delay |
| C. | increase the time delay |
| D. | increase the time constant |
| Answer» D. increase the time constant | |
| 12. |
IF_THE_INTERPOLATION_FACTOR_IS_I_=_256,_THE_A_/D_CONVERTER_OUTPUT_CAN_BE_OBTAINED_BY_AVERAGING_SUCCESSIVE_NON-OVERLAPPING_BLOCKS_OF_128_BITS.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
The slope-overload distortion is avoided, if which of the following conditions satisfy?$ |
| A. | Min| dx(t)/d(t) | ≤ ∆/T |
| B. | Max| dx(t)/d(t) | ≤ ∆/T |
| C. | |dx(t)/d(t) | ≤∆/T |
| D. | None of the mentioned |
| Answer» C. |dx(t)/d(t) | ‚Äö√Ñ√∂‚àö¬¢¬¨√ü‚Äö√Ñ√∂‚àö‚Ć‚àö√∫/T | |
| 14. |
The crosshatched areas gives two types of Quantization error in DM ,They are ?$ |
| A. | Slope-overload distortion |
| B. | Granular noise |
| C. | Slope-overload distortion & Granular noise |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
What are the effects produced by Dm by setting up an integrator at the front of DM? |
| A. | Simplifies the DM decoder |
| B. | Increases correlation of the signal into the DM input |
| C. | Emphasizes the low frequencies of x(t) |
| D. | All of the mentioned |
| Answer» E. | |
| 16. |
Which of the following is the right way to reduce distortion in the DM? |
| A. | By setting up an integrator in front of DM |
| B. | By setting up an integrator behind the DM |
| C. | By setting up an integrator in the middle of DM |
| D. | None of the mentioned |
| Answer» B. By setting up an integrator behind the DM | |
| 17. |
In DM, By increasing∆, reduces the overload distortion but increases the granular noise, and vice versa$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
What is the process of down sampling called? |
| A. | Decimation |
| B. | Fornication |
| C. | Both Decimation & Fornication |
| D. | None of the mentioned |
| Answer» B. Fornication | |
| 19. |
The noise power σn2 can be reduced by increasing the sampling rate to spread the quantization noise power over a larger frequency band (-Fs/2,Fs/2).$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
In the absence of an S/H, the input signal must change by more than one-half of the quantization step during the conversion, which may be an impractical constraint. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
In the practical A/D converters, what are the distortions and time- related degradations occur during the conversion process? |
| A. | Jitter errors |
| B. | Droops |
| C. | Nonlinear variations in the duration of the sampling aperture |
| D. | All of the mentioned |
| Answer» E. | |
| 22. |
In A/D converter, what is the time relation between sampling period T and the duration of the sample mode and the hold mode? |
| A. | Should be larger than the duration of sample mode and hold mode |
| B. | Should be smaller than the duration of sample mode and hold mode |
| C. | Should be equal to the duration of sample mode and hold mode |
| D. | Should be larger than or equals to the duration of sample mode and hold mode |
| Answer» B. Should be smaller than the duration of sample mode and hold mode | |
| 23. |
The time required to complete the conversion of Analog to Digital is ________ the duration of the hold mode of S/H. |
| A. | Greater than |
| B. | Equals to |
| C. | Less than |
| D. | Greater than or Equals to |
| Answer» D. Greater than or Equals to | |
| 24. |
T he S/H is a digitally controlled analog circuit that tracks the analog input signal during the sample mode, and then holds it fixed during the hold mode to the instantaneous value of the signal at the time the system is switched from the sample to the hold mode. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 25. |
What is the main function of (D/A) or DAC converter? |
| A. | Converts Digital to Analog Signal |
| B. | Converts Analog to Digital signal |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Converts Analog to Digital signal | |
| 26. |
What is the main function of (A/D) or ADC converter? |
| A. | Converts Digital to Analog Signal |
| B. | Converts Analog to Digital signal |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |