A good sampling frequency is one-half the frequency of interest. sampling at the

Question

A good sampling frequency is one-half the frequency of interest. sampling at the Nyquist frequency provides good frequency information b not necessarily good amplitude information. A good starting point for sample interval selection is 4-10 samples per the time constant of the fastest transfer function in the system. Difference equations, used in feedback control system applications. can be nonlinear. Phase lead compensators can reduce the lag present in a system. Phase lead compensators can introduce higher levels of high-frequency noise into a system. Phase lag compensators can introduce higher levels of high-frequency noise into a system. An 8-bit digital sensor is one-half as accurate as a 16-bit sensor. The Ziegler-Nichols tuning method yields system that overshoots by about 25% in response to a step input.

Explanation / Answer

For good sampling results, one have to consider twice the frequency and not half. Hence, the first sub part is wrong.

In Nyquist sampling, the frequency will be high but some information is lost. Hence, the second sub part is correct.

The interval [4,10] is the best interval and hence the sub part 3 is correct.

Difference equations can also be nonlinear. Hence, the sub part 4 is correct.

Phase lead compensation is used to improve stability range. So the subpart 5 is wrong.

It improves the response and not the noise. Hence subpart 6 is incorrect.

Phase lag attenuates the noise. So subpart 7 is wrong.

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