Gk Questions with AnswersNetworking Interview Question and Answers
| 31. | What is sampling? |
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It is the process of obtaining amplitude of a signal at regular intervals. |
| 32. | Define pulse amplitude modulation? |
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It is an analog to digital conversion method which takes analog signals, samples it and generates a series of pulse based on the results of the sampling. It is not used in data communication because the series of pulses generated still of any amplitude. To modify it we use pulse code modulation. |
| 33. | What is Nyquist Theorem? |
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According to this theorem, the sampling rate must be at least 2 times the highest frequency of the original signal. |
| 34. | What is Asynchronous mode of data transmission? |
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It is a serial mode of transmission.In this mode of transmission, each byte is framed with a start bit and a stop bit. There may be a variable length gap between each byte. |
| 35. | What are the different types of multiplexing? |
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Multiplexing is of three types. Frequency division multiplexing and wave division multiplexing is for analog signals and time division multiplexing is for digital signals. |