How do I find out what type of CMS does a site has? For example - http://www.247transcription.ca/ and this one http://powerfile.com/ ?
First of all, do not assume that all websites use a CMS. I briefly looked at the source code and saw no mention of any CMS platform. Which either means that they are not using a CMS, or they stripped their website of all branding. Usually it is fairly obvious if a website is using a CMS (but not always). In any case, you can always test your assumptions out by looking for common files found in specific CMS's. e.g. Wordpress always has a cp located at www.domain.com/wp-admin/.
you can sometimes see the generator: tag in the head, if not you can look @ css stylesheets being loaded or ajax scripts that are common to a CMS
It looks as if both are results of some kind of CMS. Code is far to messed up to be the product of a programmer. You may be able to narrow down the search on http://www.247transcription.ca/, because they generate aspx files to a smaller number of CMSs.