Ravi Vare was trying to ask me about this in the comments in the modules and plugins database, but that is in impossible place to have a conversation, so I am moving the discussion here. Ravi's original question was:
I want to use 'Opaque Type Question'
Any Default Values/ An Example for this Question Type ?
I stuck at
Question engine ??
Question id ??
Question version ??
(and http://docs.moodle.org/22/en/Opaque_question_type had not answered the question.) The answer is that you only need this question type if you are trying to use questions from an 'Opaque-compatible question engine' in your Moodle quiz. I only know of three such question engines:
- OpenMark - http://java.net/projects/openmark/
- ounit - http://code.google.com/p/ounit/
- STACK version 2.0 - which is rapildy being replaced by STACK 3.0 which is implemented a different way.
Unless you have already installed one of those systems, you cannot do anything with qtype_opaque. If you have installed on of those systems, their install instructions should explain how to link them to Moodle.