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 10-04-2009, 05:12 PM #1 Golden Master     Join Date: Apr 2009 Location: USA Posts: 5,438 Practace exam http://eta-i.org/practice_exams/ceta...ractice2_c.htm if u got time, how good of a grade do u get? this is a practice exam i have been doing for a few days, to get ready for my CET in Electronics. __________________ __________________ You got to have a Fiddle in the band!
10-04-2009, 05:32 PM   #2
Golden Master

Join Date: Oct 2005
Posts: 7,888
Re: Practace exam

I answered the first question right. Not willing to do ninety-nine more.

Quote:
 It is desired to raise the power to a speaker from 15 W to 30 W. This is a: 2 dB increase 6 dB increase 15 dB increase 3 dB increase
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 10-04-2009, 05:33 PM #3 Guru     Join Date: Jan 2008 Location: U.S. Posts: 7,841 Re: Practace exam ^ Is it a 2dB increase?
 10-04-2009, 05:34 PM #4 Golden Master     Join Date: Oct 2005 Posts: 7,888 Re: Practace exam ^ No. __________________ Stop the genocide now. ↳ www.savedarfur.org Send comments, suggestions and criticisms. ↳ 01001010listens@gmail.com
 10-04-2009, 05:37 PM #5 Guru     Join Date: Jan 2008 Location: U.S. Posts: 7,841 Re: Practace exam I fail. I studied dB for probably 2 days out of my entire life. I couldn't quite remember the formula, except for that it involved exponentials. As wikipedia tells me, it follows: L(dB) = 10 log (P1/P0) In this case: 3dB.
 10-04-2009, 05:38 PM #6 Golden Master     Join Date: Oct 2005 Posts: 7,888 Re: Practace exam ^ Yep. __________________ Stop the genocide now. ↳ www.savedarfur.org Send comments, suggestions and criticisms. ↳ 01001010listens@gmail.com
 10-04-2009, 05:40 PM #7 Guru     Join Date: Jan 2008 Location: U.S. Posts: 7,841 Re: Practace exam ^ (by the way, I really like this shorthand) You really have your audio down, eh? ...Gotta spread it...
 10-04-2009, 05:44 PM #8 Golden Master     Join Date: Oct 2005 Posts: 7,888 Re: Practace exam I was originally mistaken. A 10 dB increase is perceived to be twice as loud. 3 dB is usually a basis to provide headroom when you purchase an amplifier. To increase your headroom by 3 dB, you'll need to double the amount of watts you're putting out. If you want to increase your headroom by 10 dB, you'll need ten times the power. __________________ Stop the genocide now. ↳ www.savedarfur.org Send comments, suggestions and criticisms. ↳ 01001010listens@gmail.com
 10-04-2009, 06:07 PM #9 Golden Master     Join Date: Apr 2009 Location: USA Posts: 5,438 Re: Practace exam basically, when watts is doubled, or reduced by 2, it is considered a step up or down, of 3db __________________ You got to have a Fiddle in the band!
 10-04-2009, 06:19 PM #10 In Runtime     Join Date: Jan 2009 Posts: 155 Re: Practace exam The noise level in a radio receiver is generated mostly in the: A. IF stages. B. RF section. (CORRECT ANSWER) C. Local Oscillator. D. Audio section. I got this 1st one right and stopped after looking at my second question... __________________