MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The SNR value can be increased by _____ the number of levels. |
| A. | Increasing |
| B. | Decreasing |
| C. | Does not depend on |
| D. | None of the mentioned |
| Answer» B. Decreasing | |
| 2. |
When the base of the logarithm is e, the unit of measure of information is |
| A. | Bits |
| B. | Bytes |
| C. | Nats |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
Prediction gain _____ for better prediction. |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» B. Decreases | |
| 4. |
The output of the source encoder is an analog signal. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
In early late timing error detection method if the bit is constant, then the slope will be |
| A. | Close to zero |
| B. | Close to infinity |
| C. | Close to origin |
| D. | None of the mentioned |
| Answer» B. Close to infinity | |
| 6. |
Non uniform quantizer ______ distortion. |
| A. | Increases |
| B. | Decreases |
| C. | Does not effect |
| D. | None of the mentioned |
| Answer» C. Does not effect | |
| 7. |
If step size is increased _____ occurs. |
| A. | Slope overload distortion |
| B. | Granular noise |
| C. | Slope overload distortion & Granular noise |
| D. | None of the mentioned |
| Answer» C. Slope overload distortion & Granular noise | |
| 8. |
Vector quantization is used in |
| A. | Audio coding |
| B. | Video coding |
| C. | Speech coding |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 9. |
The probability density function of the envelope of narrow band noise is |
| A. | Uniform |
| B. | Gaussian |
| C. | Rayleigh |
| D. | Rician |
| Answer» C. Rayleigh | |
| 10. |
The type of noise that interferes much with high frequency transmission is |
| A. | White |
| B. | Flicker |
| C. | Transit time |
| D. | Shot |
| Answer» D. Shot | |
| 11. |
Delta modulation is |
| A. | 1 bit DPCM |
| B. | 2 bit DPCM |
| C. | 4 bit DPCM |
| D. | None of the mentioned |
| Answer» B. 2 bit DPCM | |
| 12. |
The output of an information source is |
| A. | Random |
| B. | Deterministic |
| C. | Random & Deterministic |
| D. | None of the mentioned |
| Answer» B. Deterministic | |
| 13. |
The spectral density of white noise is |
| A. | Exponential |
| B. | Uniform |
| C. | Poisson |
| D. | Gaussian |
| Answer» C. Poisson | |
| 14. |
1 bit quantizer is a |
| A. | Hard limiter |
| B. | Two level comparator |
| C. | Hard limiter & Two level comparator |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
The theoretical gain in zero crossing TED is greater than early late TED. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
The low pass filter at the output end of delta modulator depends on |
| A. | Step size |
| B. | Quantization noise |
| C. | Bandwidth |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 17. |
Uniform quantizer is also known as |
| A. | Low rise type |
| B. | Mid rise type |
| C. | High rise type |
| D. | None of the mentioned |
| Answer» C. High rise type | |
| 18. |
Thermal noise power of a resistor depends upon |
| A. | Its resistance value |
| B. | Noise temperature |
| C. | Bandwidth |
| D. | Ambient temperature |
| Answer» C. Bandwidth | |
| 19. |
Which helps in maintaining the step size? |
| A. | Delta modulation |
| B. | PCM |
| C. | DPCM |
| D. | Adaptive delta modulation |
| Answer» E. | |