Can I expunge arrest record when the record was dismissed without Prejudice?

I was changed with misdemeanor in Washington state, and my cases was dismissed without Prejudice. And I want to expunge my record.I check the law, the file needs consist only of non-conviction data, and need two years or longer has elapsed since the record became non-conviction data as a result of the entry of a disposition favorable to you.
So my question are following:
1. Am I eligible to expunge my arrest record if it is dismissed without
Prejudice not dismissed with Prejudice?
2. When expunge the record, Washington State Patrol people and FBI will
destroy the record. So after expungement, How can I answer question like
have you been arrest or not when I renew my visa or apply green card?
3. Is there a limit time dismissed without Prejudice can be refile?
thanks