Waveforms

stealthelectric said:

Hi:
On the attached file you will see some waveforms. I need to differentiate between a.c. and d.c.
a) d.c. because it is a straight line all on one side of the zero line.
b) Is also a d.c. because of the same reasons as a), but this is a pulse
c) Is an a.c. because it crosses the zero line and is a regular repeating pattern
d) Is a.c. because of the same reasons as c)
e) Is d.c. because it doesn't cross the zero line, as with a)
f) Is a.c. because if crosses the zero line and is a regular repeating pattern.

Would somebody please check this for me.
Thank you

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a      d
b      e
c       f

a    b
c     d
e    f

Hero999 said:

It's a trick question because some of the waveforms have both AC and DC components.

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I need to differentiate between a.c. and d.c.

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Hero999 said:

Then B and F are neither AC nor are they DC, they're both.

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stealthelectric said:

Hi eric:

You have read the sequence of 'a thru to f' incorrectly.


Actually, I didn't. These were my answers for the waveforms as:
a d
b e
c f

I guess I just don't understand.
So:
a=d.c.
b=d.c.
c=a.c.
d=a.c.
e=d.c.
f=a.c.
Are all incorrect?

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