New question about arithmeticlogic - Page 1
Forum section: electronics / beginners

author: etstudent
author_rank: Regular Contributor
timestamp: September 19, 2012, 01:55:17 pm
content: If you feed the digital values 0101 and 1001 into the arithmetic-logic unit, then give the IC, an AND logic command, what binary pattern will be output?1- 11002- 00013- 11104- 1101I just don't get it, even if you point me in the right direction I would be happy because I just don't get this one. Thanks again guys.

author: Codemonkey
author_rank: Regular Contributor
timestamp: September 19, 2012, 02:02:28 pm
content: 0101 AND 1001 = 0001Write them above each other01011001then look down the columns for all 1's. The only column with all 1's is the last one, so the result is 0001

author: etstudent
author_rank: Regular Contributor
timestamp: September 19, 2012, 02:04:22 pm
content: THANK YOU! Is that how you figure that out? That seems really simple. Thanks again.

author: Simon
author_rank: Unknown
timestamp: September 19, 2012, 02:05:19 pm
content: The AND operation is carried out on each pair of bits as detailed above

author: etstudent
author_rank: Regular Contributor
timestamp: September 19, 2012, 10:39:58 pm
content: Thanks guys, appreciate the help.

author: IanB
author_rank: Super Contributor
timestamp: September 20, 2012, 12:09:07 am
content: Just by way of clarification, are you being faced with this question without first having been taught the material in class, or are you being expected to teach yourself by reading books and then answer the questions as a review of the material?

author: notsob
author_rank: Frequent Contributor
timestamp: September 20, 2012, 12:30:41 am
content: some easy learning for you ethttp://www.learn-c.com/boolean.htm

author: etstudent
author_rank: Regular Contributor
timestamp: September 20, 2012, 01:10:45 am
content: Quote from: IanB on September 20, 2012, 12:09:07 amReading text books, and taking tests, then exams. I have an instructor I call, and email.

author: TerminalJack505
author_rank: Super Contributor
timestamp: September 20, 2012, 01:41:35 am
content: Quote from: etstudent on September 20, 2012, 01:10:45 amNo lectures?Here'sa linkto an excellent series of video lectures on digital systems. You can use them as a supplemental resource.

author: etstudent
author_rank: Regular Contributor
timestamp: September 20, 2012, 01:59:31 am
content: No lectures, no. Thank you for the link, I will certainly check them all out. I appreciate this board a lot, very helpful and nice people here. I've been on EE boards where people were rude and condescending.

author: Simon
author_rank: Unknown
timestamp: September 20, 2012, 06:13:30 am
content: Quote from: etstudent on September 20, 2012, 01:59:31 amjust you wait

author: etstudent
author_rank: Regular Contributor
timestamp: September 20, 2012, 11:20:53 am
content: Quote from: Simon on September 20, 2012, 06:13:30 amHa ha funny, thank god not yet, no jerks yet.

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 20, 2012, 04:32:24 pm
content: Quote from: etstudent on September 20, 2012, 01:59:31 amall you need is to push the right button, ie the right (meaning wrong) question

author: SeanB
author_rank: Super Contributor
timestamp: September 20, 2012, 05:53:11 pm
content: This is a well moderated board, generally quite well behaved in general. the general post can be informative or at least educational.I have learned from here a lot, and some was even electronics related........( Simon, used 20's will do in the usual brown envelope left in the usual place..................)

author: etstudent
author_rank: Regular Contributor
timestamp: September 20, 2012, 07:00:43 pm
content: Hey i have a question for you EE and ET veterans. I see a good amount of "Avionics technicians" jobs pop up, and they pay pretty well. As far as I can tell by reading the job descriptions its just an electronics tech that works on aviation electronics. Do you need specific training for a job like that?

author: IanB
author_rank: Super Contributor
timestamp: September 20, 2012, 07:39:11 pm
content: Quote from: etstudent on September 20, 2012, 07:00:43 pmBefore you are allowed to touch an airplane you are required to have a special certification. I don't know whether it is usual practice for your employer to sponsor you through that certification process or whether you are expected to do it on your own dime. I expect an informal inquiry after one or more of those job openings would provide your answer.

author: SeanB
author_rank: Super Contributor
timestamp: September 20, 2012, 08:35:17 pm
content: As one, there is a fair amount of training that is specific to the job, depending on what you are doing. If you are front line it means you are a glorified pump jockey, as part of the job is fuel, cleaning and polishing panels. The rest is black box changer, you diagnose the fault to a box, swap with a service exchange spare and test it cleared the fault, then paperwork and more paperwork to sign off, and send the box in for repair. Depending where you are this can involve a lot of odd hours of work, and keeping to a schedule that is not yours to set.If you work at the repair side you get a lot of boxes with assorted and often hilarious fault descriptions on the paperwork. Then you confirm the fault, fix it and check it still conforms to spec, and implement any mods that have been approved by the OEM for it, and that have been approved by an international regulatory body or the local regulatory body. then they are tested and sent to a store for use on the next aircraft. Pretty much every unit is repaired, even if it means that the only original parts left are a serial number label.You have to remember that peoples lives depend on your repairs, there is a nasty feeling when a plane goes down and you __KNOW__ that you were the one that worked on that plane, or that you did work on parts that went into it. Not a good feeling, especially when I saw it happen. Luckily the pilot did eventually decide, when he looked up, and saw from his 30 degree nose up best glide angle that the trees were now above the canopy, that now was a good time to pull the yellow and black striped handle between his legs and kiss the plane bye. He cut it close, he felt the plane hit just before the seat and him left, and he landed just behind the fire.Best fault I ever got was the following " First bomb fell on target". I just had to phone and ask, especially as I did know the pilot from seeing him around. Good pilot, still flying a fighter when the rest of his class were bus drivers of flying mahogony bombers. Big guy too, had to take the seat to full lift to get in or out, like me when working in the cockpit. How he fitted the golf clubs in as well........BTW there is a big difference in the skills and training for this, depending on the job. You normally do a 3 year apprenticeship before getting the initial qualifications. This then gets extended as you qualify for extra tasks and well described repairs you are allowed to do and sign off. You take a long time before you get your inspectors number and are allowed to sign off the work without having a more experienced person checking that you have done it to spec and to their satisfaction. After that you then are responsible for your work, and for the work of those under you.

author: etstudent
author_rank: Regular Contributor
timestamp: September 20, 2012, 08:51:02 pm
content: Wow great info, thanks. Its very involved I see, I was just curious anyway. I doubt I would even go for a job like that.