User blog:RemosPendragon/Questions to ask

Couple things has crossed with me while extracting FFG Dark Heresy:Core Rulebook on one of our sibling wikis and I'd like to ask these out from the well-educated community of ours.

AdMech
In DH:CR it is stated...
 * 1) that "Cult Mechanicus" is a synonym for "Adeptus Mechanicus". True or false?
 * 2) that all members of the Adeptus Mechanicus are collectively known as tech-priests. True or false?
 * 3) that tech-priest is, however, an independent rank within the Adeptus Mechanicus organisation. True or false?
 * 4) some AdMech members specialise in some particular area, possibly becoming a "Magos". Is there any official name for these studies, meaning, are they called "institutes", "disciplines", "facualties" or what? (Lex uses "Disciplines"

Ranks/titles
As a role playing game, character classes have their progress trees, presented to us as ranks. Can these character ranks be used as... As an example to those. Guardsmen have conscript, guard, armsman, sergeant, veteran and then separatign into three paths which seem somewhat... out of place (stormtrooper, for example, being there). Then on the other hand we have quite formidable looking ecclesiarchy ranks.
 * 1) Imperial organisations' official hierarchy?
 * 2) If so, where does those ranks go, what are represented in other source books but are left out in DH:CR?

As for now, nothing more comes in my mind, but just wanted to ask these as they have bothered me a bit.