| 51. | _______ encoding has a transition at the beginning of each 0 bit. |
| a. | RZ |
| b. | Manchester |
| c. | Differential Manchester |
| d. | All the above |
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Answer: (c).Differential Manchester
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| 52. | PCM is an example of _______ conversion. |
| a. | digital-to-digital |
| b. | digital-to-analog |
| c. | analog-to-analog |
| d. | analog-to-digital |
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Answer: (d).analog-to-digital
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| 53. | If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem? |
| a. | 200 samples/s |
| b. | 500 samples/s |
| c. | 1000 samples/s |
| d. | 1200 samples/s |
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Answer: (d).1200 samples/s
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| 54. | The Nyquist theorem specifies the minimum sampling rate to be_______. |
| a. | equal to the lowest frequency of a signal |
| b. | equal to the highest frequency of a signal |
| c. | twice the bandwidth of a signal |
| d. | twice the highest frequency of a signal |
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Answer: (d).twice the highest frequency of a signal
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| 55. | Which of the following encoding methods does not provide for synchronization? |
| a. | NRZ-L |
| b. | RZ |
| c. | NRZ-I |
| d. | Manchester |
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Answer: (a).NRZ-L
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| 56. | Which encoding method uses alternating positive and negative values for 1s? |
| a. | NRZ-I |
| b. | RZ |
| c. | Manchester |
| d. | AMI |
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Answer: (d).AMI
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| 57. | Which quantization level results in a more faithful reproduction of the signal? |
| a. | 2 |
| b. | 8 |
| c. | 16 |
| d. | 32 |
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Answer: (d).32
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| 58. | Block coding can help in _______ at the receiver. |
| a. | Synchronization |
| b. | Error detection |
| c. | Attenuation |
| d. | both (a) and (b) |
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Answer: (d).both (a) and (b)
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| 59. | In _______ transmission, a start bit and a stop bit frame a character byte. |
| a. | asynchronous serial |
| b. | synchronous serial |
| c. | parallel |
| d. | (a) and (b) |
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Answer: (a).asynchronous serial
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| 60. | In asynchronous transmission, the gap time between bytes is _______. |
| a. | fixed |
| b. | variable |
| c. | a function of the data rate |
| d. | zero |
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Answer: (b).variable
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