Oh, be quiet. You aren't helping. No, no repeated quests drop nobility except for the first one. They do not drop xtals either. However, citizen is correct. Forumers don't like seing 2 sentence posts. Search in the help section of the forums for answers, it may take longer but it is better for the community.
After all quests are complete you can farm nobs from the first quest. Usually drops 1 for every 2 full atk bars for me.
At the end of every batch (or whatever you want to call it) of quest there is a chance to drop nobs I got 6 so far...
Every quest has a chance (approx 1% per success) to reward a nobility. It's even rarer for a quest to drop xtals when repeating quests. Realistically it's not worth the grinding. The first quest is the easiest so that's why people grind that one.
All quests can drop. Not just the first one. The rate is just very low. In future please use wc or the questions thread in the questions and feedback section. Thanks. /lock.