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Did I pass my exam????!

Karl Backe

May 28, 2015
1
Joined
May 28, 2015
Messages
1
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

210m7pw.jpg



Question 2

20gh11.jpg
 

Heevy

May 27, 2015
4
Joined
May 27, 2015
Messages
4
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
 

Ratch

Mar 10, 2013
1,099
Joined
Mar 10, 2013
Messages
1,099
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

210m7pw.jpg



Question 2

20gh11.jpg

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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