Gah! I have a competency test tomrw(EE majors)

Raithed

China7078 Posts

April 14 2008 20:57 GMT

And the prof only e-mailed us today. I don't remember most of it because I haven't taken it in years, was wondering if some people can just give me some hints on starting this. The following is an exam from last year the prof. said, someone please help. I want to study for this.

http://docs.google.com/Doc?id=dgjfrccn_7gg692jxb

1. For number one, I know there is one OR gate and 2 XOR(?) gate, how does one combine it, I really really don't remember.
2. Basically following number 1, following this website: http://www.play-hookey.com/digital/basic_gates.html I can tell that all of it is (+) right?

I just want to start with 1 & 2 so I can relearn it, I'll work on the rest in a bit. Thanks in advance.

Raithed

China7078 Posts

April 14 2008 21:32 GMT

Alright, further reading on some other sites and dug up the textbook, it's not a XOR gate, it's an OR gate with 2 not's. Oh man, grr.

Myrmidon

United States9452 Posts

April 15 2008 00:21 GMT

You good with the rest of the old test?

Daveed

United States236 Posts

April 15 2008 00:28 GMT

For the first one, just check it. The Not's after the first two gates cancel out with the not's at the input of the rightmost gate. So all four of those NOT's get killed, and it's just OR gates, with the two NOT's at the top two inputs.

So it's (A'+B')+ (B+C)

Daveed

United States236 Posts

April 15 2008 00:29 GMT

So you have B' + B, so this whole thing is just a "true"

Raithed

China7078 Posts

April 15 2008 11:26 GMT

On April 15 2008 09:21 Myrmidon wrote:
You good with the rest of the old test?

I'd have to answer that with barely, and I figured out number 1 and 2, thanks guys.

Please or register to reply.

Gah! I have a competency test tomrw(EE majors)

Completed

Ongoing

Upcoming