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Did I pass my exam????!

Discussion in 'General Electronics Discussion' started by Karl Backe, May 28, 2015.

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  1. Karl Backe

    Karl Backe

    1
    0
    May 28, 2015
    Hi guys!

    I'm so curious. I've just finished a hard exam (well, at least for me) and I will have to wait a few weeks before the offical result comes out. So I thought I ask you here, did I pass or not?

    I've figured out that if I had the right answer on one of this, it means I did... so did I pick the right answer?

    I'd be very pleased to know, thanks! :)

    Question 1

    [​IMG]


    Question 2

    [​IMG]
     
  2. Heevy

    Heevy

    4
    0
    May 27, 2015
    as far as i can see, the first is a second order lowpass filter which would make it:

    T(s) = 1/LC / (s^2+s(1/CR)+ 1/LC) so that would be the second choice.

    As for the second problem, a voltage divider times 10/s:

    10/s * 1000 / s*10*10^-3 + 1000 = 100*10^4 / s*(s+100*10^3)

    as far as i can see, the first one is wrong but the second one is correct :)

    Best of luck to you.

    Heevy
     
  3. Ratch

    Ratch

    1,094
    335
    Mar 10, 2013
    Your second answer is correct. It is a simple algebraic manipulation to find the answer. The first answer is wrong, because you can see that the curve is dropping 40 db per decade. Therefore there must be a s^2 term in the denominator when there are no s terms in the numerator. The second answer is the only one that fits that criteria.

    Ratch
     
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