Hi, are you doing this module? condolences. I recently got a small 12/5V 1A SMPS to pass military grade EMC with little sheilding and my study of this module did nothing to help in that
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So to question section b specifically, my answer was:
The third harmonic calculated using the formula on page 3 of EC-3-2 is xxxxxxxx. The 101st harmonic is xxxxxx.
I got into the habit of reminding them of their own text that had driven the answer especially when the explanation made no sense and it seemed to be a case of monkey see monkey do like it is here as they have over condensed and over simplified the theory.
Who is the tutor on this now? if it is Andy, he's a lovely chap and is not hard on his students in marking if they demonstrate effort and grasp of the subject. Don't be afraid to answer the way you want to after giving them what they want, showing that you understand beyond the scope of the question may get you some forgiveness for minor errors.
Always remember when answering these questions, forget what you may already know, work out which bit of their theory they are talking about as that is all they are interested in and given the strange way they explain stuff questions can only be correctly answered using their explanations. The stranger the question the more it was targeted at their strange theory. The sad thing about the EMC stuff is that you can't just pick up an alternative book about it as they are several hundred pages long, expensive and very in depth.
Don't bother with the distributed control systems module, it's not worth the electrons used to store it in memory.