| 221. | SNR (signal to noise ratio) is equals to |
| a. | Avg signal power/Avg noise power |
| b. | Avg signal power/Avg distortion |
| c. | Avg noise power/Attenuation |
| d. | Avg Attenuation/Avg distortion |
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Answer: (a).Avg signal power/Avg noise power
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| 222. | One Picoseconds (PS) is equivalent to |
| a. | 10-3 s |
| b. | 10-6 s |
| c. | 10-9 s |
| d. | 10-12 s |
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|
Answer: (d).10-12 s
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| 223. | We cannot send the digital signal directly to the channel, when the channel is |
| a. | bandpass |
| b. | Bypass |
| c. | baseband |
| d. | Low pass |
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Answer: (a).bandpass
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| 224. | The difference in the delay of the signal may create a difference in |
| a. | Phase |
| b. | Frequency |
| c. | Period |
| d. | Decibel |
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Answer: (a).Phase
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| 225. | Signal to Noise Ratio is the ratio of the two |
| a. | Signals |
| b. | Powers |
| c. | Noise |
| d. | Frequencies |
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Answer: (b).Powers
|
| 226. | According to Fourier analysis, any composite signal is a combination of sine waves with |
| a. | diff frequencies amplitude, and phase |
| b. | different frequencies |
| c. | same frequencies |
| d. | same frequencies with amplitude and phase |
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|
Answer: (a).diff frequencies amplitude, and phase
|
| 227. | How many factors data rate limit depends on |
| a. | One |
| b. | two |
| c. | four |
| d. | three |
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Answer: (d).three
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| 228. | Consider the below figure. What are the bits transmitted for the Unipolar system?
 |
| a. | 01101 |
| b. | 11010 |
| c. | 10110 |
| d. | 01001 |
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Answer: (c).10110
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| 229. | If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth? |
| a. | 2500 Hz |
| b. | 900 Hz |
| c. | 800 Hz |
| d. | can’t be determined with the information given |
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Answer: (c).800 Hz
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| 230. | Assume we need to download text documents at the rate of 100 pages per second. What is the required bit rate of the channel? |
| a. | 1.846 Mbps |
| b. | 1.536 Mbps |
| c. | 2.4 Mbps |
| d. | None of the Mentioned |
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Answer: (b).1.536 Mbps
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