Yes they review each case individually for the position applied for. Due to certain convictions and the nature of the job there may not be a fit. For example a convicted child preditor can be hired as a school milk delivery driver.
Yes, as long as you do not volunteer that information. The application asks “have you been convicted of a felony in the last seven years”. Answer truthfully (NO)
No. If you volunteer that you are, a reason to NOT hire you will be found.